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"Korosi sebagai penyebab utama kegagalan di industri migas dapat dicegah dengan menggunakan green inhibitor yang bersifat aman, mudah diperoleh, biodegradeable, murah, dan ramah lingkungan. Penelitian ini bertujuan untuk mengetahui kadar optimal campuran kedua ekstrak ubi ungu dan melinjo untuk melindungi baja API 5L di lingkungan NaCl 3,5% dengan metode kehilangan berat dan polarisasi. Kedua green inhibitor dipilih karena mengandung senyawa antioksidan yang dapat menghambat laju korosi. Hasil penelitian menunjukkan bahwa kedua inhibitor yang digunakan anti-sinergis dimana kebanyakan variasi kadar pencampuran melindungi sampel kurang baik dibandingkan dengan salah satu inhibitor tersebut. Pencampuran 6 ml kedua ekstrak menghasilkan perlindungan maksimal terhadap korosi.

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Corrosion as the main cause of material failure in oil industries can be prevented with green inhibitors, which are easily accessible, biodegradable, cheap and environmental friendly. This research is intended to determined the optimal mixing concentration of both purple sweet potato and melinjo extract in protecting API 5L steel in NaCl 3,5% environment by weight loss and polarization tests. These inhibitors are selected as they contain antioxidants to decrease corrosion rate. The results of the research conclude that these inhibitors not anti-synergic as most of the mixing concentration provide worse protection against corrosion than either one of the inhibitors. The optimal mixing concentration is both extracts at 6 ml."

"Inhibisi merupakan salah satu metode penghambatan laju korosi, salah satu jenis dari inhibitor adalah inhibitor organik yang memiliki sifat biodegradable sehingga bersifat lebih ramah lingkungandan relatif lebih murah dibandingkan inhibitor anorganik.Penelitian ini dilakukan untuk mempelajari perilaku inhibisi dari campuran ekstrak melinjo dan kunyit pada pipa baja API-5L di lingkungan NaCl 3,5% dengan menggunakan metode kehilangan berat dan polarisasi. Dalam penelitian ini variasi kadar ekstrak melinjo dan kunyit dicampur dengan berbagai kadar. Sebagai single inhibitor melinjo menghasilkan efisiensi yang lebih tinggi dari sebagian besar kadar campuran. Pada percobaan polarisasi efisiensi terbaik ada pada campuran 6 ml kedua ekstrak dengan acampuran 8 ml kedua ekstrak sebagai efisiensi kedua terbaik.

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Inhibition is one of corrosion protection method, one kind of corrosion inhibitor is organic inhibitor which has biodegradable characteristic thus the inhibitor is environmental friendlier than conventional inorganic inhibitor. This research was done to study the inhibition activity of combination between melinjo and turmeric extract for API-5L steel pipe in NaCl 3,5% environment. Weight loss and polarization method were used to measure the inhibitor efficiency.

In this study concentration of melinjo extract and turmeric extract were varied.It was found that as a single inhibitor melinjo extract has more efficiency than the combination inhibitor. In polarization method it was found that the combination of 6 ml of the two extract has the highest efficiency followed by the combination of 8ml."

"Penelitian ini dilakukan untuk mempelajari mekanisme ekstrak kunyit putih Curcuma Zedoaria dan ekstrak ubi jalar ungu Ipomoea Batatas sebagai inhibitor korosi ramah lingkungan untuk API 5L pada lingkungan 3,5 NaCl. Karakterisasi kedua inhibitor dilakukan dengan pengujian FTIR dan menunjukkan bahwa senyawa yang terdapat pada kedua inhibitor tersebut adalah senyawa flavonoid. Pengujian polarisasi potensiodinamik dan EIS dengan variasi penambahan inhibitor serta campuran antara kedua inhibitor dilakukan untuk mempelajari sifat inhibisi, dari penelitian ini dapat diketahui bahwa masing ndash; masing kedua inhibitor dapat digunakan sebagai inhibitor ramah lingkungan untuk logam API 5L pada lingkungan 3,5 NaCl sedangkan campuran antara kedua inhibitor tersebut tidak dapat melindungi logam API 5L pada lingkungan 3,5 NaCl. Dari pengujian polarisasi potensiodinamik menunjukkan bahwa dengan penambahan konsentrasi inhibitor ekstrak kunyit putih maka laju korosi akan semakin menurun dan nilai efisiensi inhibisi semakin naik dengan nilai tertinggi adalah 70,5 , sedangkan dengan penambahan konsentrasi inhibitor ekstrak ubi jalar ungu laju korosi semakin turun dengan nilai efisiensi inhibisi maksimal sebesar 15,09. Namun hasil pengujian polarisasi potensiodinamik untuk inhibitor ekstrak kunyit putih 400 ppm yang ditambah dengan ekstrak ubi jalr ungu menunjukkan nilai laju korosi yang semakin meningkat. Hasil pengujian EIS menunjukkan bahwa kedua inhibitor ini dapat melindungi logam dengan membentuk sebuah lapisan film yang melapisi permukaan logam. Mekanisme adsorpsi inhibitor menunjukkan sebagai mekanisme adsorpsi secara fisik dan kimia serta sesuai dengan model dari Langmuir.

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This study was conducted to study the mechanism of white turmeric extract Curcuma Zedoaria and purple sweet potato extract Ipomoea Batatas as a green corrosion inhibitor for API 5L in a 3.5 NaCl environment. The characterization of both inhibitors was done by FTIR testing and showed that the compounds present in both inhibitors were flavonoids. Potentiodynamic polarization and EIS polarization with variation of inhibitor addition and mixture of both inhibitors were performed to study the inhibitory properties, from this study it can be seen that each of the two inhibitors can be used as a green corrosion inhibitor for API 5L metal in a 3.5 NaCl environment whereas the mixture between the two inhibitors can not protect the 5L API in the 3.5 NaCl environment.

From potentiodynamic polarization testing showed that with the addition of white turmeric extract inhibitor concentration, the corrosion rate will decrease and the value of inhibition efficiency increases with the highest value is 70,5 , whereas with the addition of purple sweet potato extract inhibitor concentration decreasing with efficiency value maximum inhibition of 15.09.

However, potentiodinamic polarization test results for a 400 ppm white turmeric extract inhibitor added with purple java extract showed an increasing rate of corrosion rate. The results of the EIS test show that these two inhibitors can protect the metal by forming a film coating that coats the metal surface. The mechanism of adsorption inhibitor shows as a physical and chemical adsorption mechanism and is in accordance with the model of Langmuir. "

"[ABSTRAKPenelitian pemanfaatan ekstrak tumbuh-tumbuhan sebagai inhibitor korosibelakangan ini semakin meningkat seiring dengan meningkatnya permintaanpenggunaan bahan-bahan kimia yang ramah lingkungan. Pemanfaatan ekstraktumbuh-tumbuhan sebagai inhibitor korosi menjadi penting mengingatkarakteristiknya ramah lingkungan (green inhibitor), mudah ketersediaannnya,sumberdaya yang melimpah dan dapat diperbaharui, prosedur produksi yangsederhana, dan biaya produksi yang cukup kompetitif. Dalam penelitian inidilakukan pengujian eksperimental efek sinergis jenis inhhibitor baru yaituekstrak ubi ungu (Ipomoea batatas L.) yang memiliki kandungan utamaantosianin dengan inhibitor komersial berbasis amine (aniline) dan denganinhibitor asam askorbat.Penelitian bertujuan untuk menganalisis laju kororsi dan efisiensi inhibisikorosi logam baja (API 5L) di dalam lingkungan air terproduksi menggunakaninhibitor campuran ekstrak ubi ungu dan inhibitor komersial berbasis amine(aniline). Selain itu dilakukan pula analisis laju korosi, efisiensi inhibisi,mekanisme proteksi dan model lapisan inhibisi korosi logam baja (API 5L) didalam lingkungan 3,5% NaCl menggunakan inhibitor campuran ekstrak ubi ungudan asam askorbat.Metode pengukuran laju korosi dan efisiensi inhibisi dilakukanmenggunakan elektrokimia kurva polarisasi. Mekanisme korosi diteliti denganmenggunakan metode Electrochemical Impedance Spectroscopy (EIS). Untukmenganalisis model lapisan inhibisi dilakukan dengan menggunakan metodeFourier Transform Infra Red (FTIR) spectroscopy.Hasil penelitian menunjukan bahwa pencampuran ekstrak ubi ungumemiliki kemampuan sinergis dengan inhibitor komersial berbasis amine (aniline)pada fraksi volume ekstrak ubi ungu sebesar 25% dengan menghasilkan efisiensiinhibisi sebesar 82,14%. Sebagai pembanding, pada sistem yang samapenggunaan esktrak ubi ungu saja menghasilkan efisiensi inhibisi 68,30%,sedangkan penggunaan inhibitor komersial berbasis amine (aniline) sajamenghasilkan efisiensi inhibisi 74,88%.Penambahan volume ekstrak ubi ungu dari 1 mL hingga 4 mL kedalaminhibitor asam askorbat 10-4 M meningkatkan efisiensi inhibisi korosi logam baja(API 5L) dalam larutan 3,5% NaCl dari efisiensi inhibisi sebesar 23,37% menjadi57,52%. Campuran inhibitor korosi tersebut berpengaruh terhadap kurvapolarisasi anodik maupun katodik sehingga dapat berperan sebagai mixedinhibitor. Pengujian EIS menunjukan proses korosi dikontrol oleh mekanismepasivasi yang ditunjukan oleh adanya peningkatan tahanan permukaan korosi.Pada lapisan permukaan terjadi proses adsorpsi dan pembentukan kelatorgano (flavonoid) logam dimana ekstrak ubi ungu dengan kandungan utamaantosianin berperan sebagai pembentuk metal-chelated. Pembentukan kelatekstrak ubi ungu-Fe-asam askorbat terjadi pada gugus hidroksil dan karbonil.Lokasi terjadinya ligan kelat ekstrak ubi ungu dengan kandungan utma antosianinterjadi pada ikatan 3?, 4? Dihydroxy cincin B atau 3-Hydroxy 4-Carbonyl cincin C;

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ABSTRACTResearch of utilization of plant extracts as a corrosion inhibitor recentlyincreased along with the increasing demand for the use of chemicals that areenvironmentally friendly. Utilization of plant extracts as a corrosion inhibitorbecomes important given the characteristics of environmentally friendly (greeninhibitor), easy availability, resources are abundant and renewable, the productionprocedure is simple, and the production costs are quite competitive. In thisresearch, experimental testing of the synergistic effects of new types inhibitor ieextract purple potato (Ipomoea batatas L.) which has the main content ofanthocyanin with commercial inhibitor-based amine (aniline) and with ascorbicacid inhibitors.The study aims to analyze the rate of corrosion and metal corrosioninhibition efficiency of steel (API 5L) in the produced water environment using amixed inhibitor purple sweet potato extract and commercial-based inhibitors ofamine (aniline). In addition, the corrosion rate analysis was also performed,inhibition efficiency, protection mechanisms and models of metal corrosioninhibition layer steel (API 5L) in the neighborhood of 3.5% NaCl using a mixedinhibitor purple sweet potato extract and ascorbic acid.Method of measuring the rate of corrosion and inhibition efficiency wasperformed using electrochemical polarization curves. Corrosion mechanismsinvestigated by Electrochemical Impedance Spectroscopy (EIS). To analyze themodel layer of inhibition were calculated using Fourier Transform Infra Red(FTIR) spectroscopy.The results showed that mixing purple sweetpotato extract has the abilityto synergistically with commercial inhibitor-based amine (aniline) in purplesweetpotato extract volume fraction of 25% with a yield of 82.14% inhibitionefficiency. For comparison, the same system using purple sweet potato extractonly produce inhibition efficiency of 68.30%, while the use of commercial-basedinhibitors of amine (aniline) alone resulted in inhibition efficiency of 74.88%.The addition of purple sweet potato extract volume of 1 mL to 4 mL intoascorbic acid inhibitors 10-4 M improving steel metal corrosion inhibitionefficiency (API 5L) in a solution of 3.5% NaCl of inhibition efficiency of 23.37%to 57.52%. The corrosion inhibitor mixture affect the anodic and cathodicpolarization curves so that it can act as a mixed inhibitor. Testing EIS shows thecorrosion process is controlled by the passivation mechanism indicated by anincrease in the surface resistance of corrosion.On the surface layer of a process of adsorption and formation of organochelates (flavonoids) in which the metal purple sweet potato extract with the maincontent of anthocyanins act as forming metal-chelated. Location of the chelatingligand purple sweet potato extract with the main content of anthocyanins occur inbond 3 ', 4' dihydroxy ring B or 3-Hydroxy 4-Carbonyl ring C.;Research of utilization of plant extracts as a corrosion inhibitor recentlyincreased along with the increasing demand for the use of chemicals that areenvironmentally friendly. Utilization of plant extracts as a corrosion inhibitorbecomes important given the characteristics of environmentally friendly (greeninhibitor), easy availability, resources are abundant and renewable, the productionprocedure is simple, and the production costs are quite competitive. In thisresearch, experimental testing of the synergistic effects of new types inhibitor ieextract purple potato (Ipomoea batatas L.) which has the main content ofanthocyanin with commercial inhibitor-based amine (aniline) and with ascorbicacid inhibitors.The study aims to analyze the rate of corrosion and metal corrosioninhibition efficiency of steel (API 5L) in the produced water environment using amixed inhibitor purple sweet potato extract and commercial-based inhibitors ofamine (aniline). In addition, the corrosion rate analysis was also performed,inhibition efficiency, protection mechanisms and models of metal corrosioninhibition layer steel (API 5L) in the neighborhood of 3.5% NaCl using a mixedinhibitor purple sweet potato extract and ascorbic acid.Method of measuring the rate of corrosion and inhibition efficiency wasperformed using electrochemical polarization curves. Corrosion mechanismsinvestigated by Electrochemical Impedance Spectroscopy (EIS). To analyze themodel layer of inhibition were calculated using Fourier Transform Infra Red(FTIR) spectroscopy.The results showed that mixing purple sweetpotato extract has the abilityto synergistically with commercial inhibitor-based amine (aniline) in purplesweetpotato extract volume fraction of 25% with a yield of 82.14% inhibitionefficiency. For comparison, the same system using purple sweet potato extractonly produce inhibition efficiency of 68.30%, while the use of commercial-basedinhibitors of amine (aniline) alone resulted in inhibition efficiency of 74.88%.The addition of purple sweet potato extract volume of 1 mL to 4 mL intoascorbic acid inhibitors 10-4 M improving steel metal corrosion inhibitionefficiency (API 5L) in a solution of 3.5% NaCl of inhibition efficiency of 23.37%to 57.52%. The corrosion inhibitor mixture affect the anodic and cathodicpolarization curves so that it can act as a mixed inhibitor. Testing EIS shows thecorrosion process is controlled by the passivation mechanism indicated by anincrease in the surface resistance of corrosion.On the surface layer of a process of adsorption and formation of organochelates (flavonoids) in which the metal purple sweet potato extract with the maincontent of anthocyanins act as forming metal-chelated. Location of the chelatingligand purple sweet potato extract with the main content of anthocyanins occur inbond 3 ', 4' dihydroxy ring B or 3-Hydroxy 4-Carbonyl ring C., Research of utilization of plant extracts as a corrosion inhibitor recentlyincreased along with the increasing demand for the use of chemicals that areenvironmentally friendly. Utilization of plant extracts as a corrosion inhibitorbecomes important given the characteristics of environmentally friendly (greeninhibitor), easy availability, resources are abundant and renewable, the productionprocedure is simple, and the production costs are quite competitive. In thisresearch, experimental testing of the synergistic effects of new types inhibitor ieextract purple potato (Ipomoea batatas L.) which has the main content ofanthocyanin with commercial inhibitor-based amine (aniline) and with ascorbicacid inhibitors.The study aims to analyze the rate of corrosion and metal corrosioninhibition efficiency of steel (API 5L) in the produced water environment using amixed inhibitor purple sweet potato extract and commercial-based inhibitors ofamine (aniline). In addition, the corrosion rate analysis was also performed,inhibition efficiency, protection mechanisms and models of metal corrosioninhibition layer steel (API 5L) in the neighborhood of 3.5% NaCl using a mixedinhibitor purple sweet potato extract and ascorbic acid.Method of measuring the rate of corrosion and inhibition efficiency wasperformed using electrochemical polarization curves. Corrosion mechanismsinvestigated by Electrochemical Impedance Spectroscopy (EIS). To analyze themodel layer of inhibition were calculated using Fourier Transform Infra Red(FTIR) spectroscopy.The results showed that mixing purple sweetpotato extract has the abilityto synergistically with commercial inhibitor-based amine (aniline) in purplesweetpotato extract volume fraction of 25% with a yield of 82.14% inhibitionefficiency. For comparison, the same system using purple sweet potato extractonly produce inhibition efficiency of 68.30%, while the use of commercial-basedinhibitors of amine (aniline) alone resulted in inhibition efficiency of 74.88%.The addition of purple sweet potato extract volume of 1 mL to 4 mL intoascorbic acid inhibitors 10-4 M improving steel metal corrosion inhibitionefficiency (API 5L) in a solution of 3.5% NaCl of inhibition efficiency of 23.37%to 57.52%. The corrosion inhibitor mixture affect the anodic and cathodicpolarization curves so that it can act as a mixed inhibitor. Testing EIS shows thecorrosion process is controlled by the passivation mechanism indicated by anincrease in the surface resistance of corrosion.On the surface layer of a process of adsorption and formation of organochelates (flavonoids) in which the metal purple sweet potato extract with the maincontent of anthocyanins act as forming metal-chelated. Location of the chelatingligand purple sweet potato extract with the main content of anthocyanins occur inbond 3 ', 4' dihydroxy ring B or 3-Hydroxy 4-Carbonyl ring C.]"

"Ekstrak biji keluak dan ubi ungu merupakan ekstrak inhibitor dari tumbuhan yang potensial dapat dijadikan bahan inhibitor alternatif ramah lingkungan untuk diaplikasikan pada pipa baja API 5L. Kemampuan inhibisi korosi dari kedua inhibitor ini diinvestigasi dengan menggunakan pengujian Polarisasi Potensiodinamik dan 'Electrochemical Impedance Spectroscopy<' (EIS). Sedangkan senyawa kimia yang terkandung didalam inhibitor diinvestigasi dengan pengujian FTIR. Dari hasil karakterisasi yang dilakukan terhadap kedua ekstrak inhibitor tersebut dengan pengujian FTIR menunjukkan bahwa senyawa yang terdapat pada kedua inhibitor tersebut adalah senyawa golongan 'flavonoid<' dari group fungsi polar seperti hidroksil dan karbonil. Sedangkan dari hasil pengujian elektrokimia didapatkan efisiensi inhibisi terbaik terjadi pada konsentrasi inhibitor yang secara berturut- turut adalah 4000 ppm pada ekstrak biji keluak dengan efisiensi 61.28%, 3000 ppm pada ekstrak ubi ungu dengan efisiensi 65.31% dan 4000 ppm : 4000 ppm pada kombinasi ekstrak biji keluak & ubi ungu dengan efisiensi sebesar 26.93%. Hasil pengujian EIS menunjukkan bahwa kedua inhibitor ini dapat melindungi logam dengan membentuk sebuah lapisan film yang melapisi permukaan logam. Mekanisme adsorpsi inhibitor menunjukkan sebagai mekanisme adsorpsi secara fisik serta sesuai dengan model dari Langmuir dan Tempkin.

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Keluak seed extract and purple sweet potato are inhibitor extracts from plants that have the potential to be made as an environmental friendly inhibitors to apply for API 5L steel pipes. Corrosion inhibition ability of these two inhibitors were investigated by using Potentiodynamic Polarization and Electrochemical Impedance Spectroscopy (EIS) tests. While the chemical compounds contained in inhibitor were investigated by FTIR testing. From the results of the characterization performed on the two inhibitor extracts by FTIR testing showed that the compounds contained in the two inhibitors were flavonoid compounds from polar function groups such as hydroxyl and carbonyl.

Meanwhile, the results of the electrochemical test showed that the best inhibition efficiency occurred on inhibitor concentration of 4000 ppm in the extract of keluak seed with efficiency of 61.28%, 3000 ppm in the purple sweet potato extract with efficiency of 65.31% and 4000 ppm : 4000 ppm in a combination of keluak seed extract & purple sweet potatoes with efficiency of 26.93%, respectively. The EIS test results showed that these two inhibitors can protect the metal by forming a film layer that inhibited the metal surface. The adsorption mechanism of the inhibitor shows as a physical adsorption mechanism and in accordance with the models from Langmuir and Tempkin."

"ABSTRAKKorosi merupakan suatu proses degradasi material akibat interaksi denganlingkungannya. Inhibitor korosi merupakan suatu zat yang dapat menghambatproses korosi. Bahan organik dipilih sebagai alternatif karena bersifat aman,mudah didapatkan, bersifat biodegradable, biaya murah, dan ramah lingkungan.Penelitian ini merupakan studi tentang inhibitor korosi menggunakan senyawaorganik yang dilakukan pada material baja API 5L di lingkungan larutan NaCl3,5%. Penelitian ini dilakukan untuk mempelajari efek penggunaan campuranekstrak daun sirsak dan ubi ungu sebagai inhibitor korosi dengan variasikonsentrasi. Ekstrak daun sirsak dan ubi ungu dipilih sebagai inhibitor korosikarena mengandung senyawa antioksidan yang dapat menghambat laju korosi.Pengukuran laju korosi dilakukan dengan menggunakan metode kehilangan beratdan polarisasi. Mekanisme terjadinya korosi diuji dengan menggunakanElectrochemical Impedance Spectroscopy (EIS) sementara karakterisasi darimaterial inhibitor organik dilakukan dengan menggunakan metode FourierTransform Infra-Red (FTIR). Tipe ikatan kimia yang terbentuk di lapisanpermukaan baja dianalisa dengan metode FTIR yang mengindikasikan adanyagugus fungsi karbonil (C=O) dan hidroksil (O-H) yang berkombinasi membentuksuatu lapisan. Di dalam larutan 100 mL NaCl 3,5%, penambahan ekstrak daunsirsak sebanyak 1 mL menghasilkan efisiensi inhibitor sekitar 73,38% (melaluipengujian polarisasi) dan di dalam larutan 520 mL NaCl 3,5%, penambahanekstrak daun sirsak sebanyak 1 mL menghasilkan efisiensi inhibitor sekitar 50%(melalui pengujian kehilangan berat). Kemudian, penambahan ekstrak ubi ungusebanyak 1-5 mL menyebabkan terjadinya penurunan efisiensi inhibitor. Ekstrakdaun sirsak dan ubi ungu bekerja dengan membentuk suatu lapisan tipis yangmengendap (adsorpsi) pada permukaan logam sebagai lapisan pelindung yangdapat menghambat reaksi logam tersebut dengan lingkungannya. Mekanisme inijuga didukung dengan meningkatnya nilai tahanan polarisasi dari permukaan bajasetelah ditambahkan inhibitor.

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ABSTRACTCorrosion is a degradation of the material due to its interaction with theenvironment. Corrosion inhibitor is a substance that can inhibit the corrosionprocess. The use of organic corrosion inhibitor become a new alternative toachieve that goal, it happen because the organic corrosion inhibitor is safe, cheap,biodegradable, and environmentally friendly. This research is the study ofcorrosion inhibitor using organic compounds for API 5L steel in 3.5% NaClsolution. This research was conducted to study the use of mixture of annonamuricata leaves and purple sweet potato extracts as corrosion inhibitor withvariable concentration. Annona muricata leaves and purple sweet potato extractsare selected as corrosion inhibitor because they contain antioxidant compoundsthat can inhibit the corrosion rate. Corrosion rate measurement method wasconducted by using the weight loss and polarization methods. Corrosionmechanism was examined by Electrochemical Impedance Spectroscopy (EIS)while the characterization of organic inhibitor material was carried out using themethod of Fourier Transform Infra-Red (FTIR). The type of chemical bonds onthe steel surface layer was analyzed by FTIR method which indicated the presenceof functional groups carbonyl (C=O) and hydroxyl (O-H) which combined as filmforming. In a solution containing 100 mL 3.5% NaCl, the addition of 1 mLannona muricata leaves extract resulted in approximately 73.38% inhibitorefficiency (using the polarization method) and in a solution containing 520 mL3.5% NaCl, the addition of 1 mL annona muricata leaves extract resulted inapproximately 50% inhibitor efficiency (using the weight loss method). Then, theaddition of 1-5 mL purple sweet potato extract resulted the decreasing of inhibitorefficiency. Annona muricata leaves and purple sweet potato extracts work byforming a thin layer which settles (adsorption) to metal surfaces as a protectivelayer that can inhibit the reaction of the metal with its environment. Thismechanism is also supported by the increased value of the polarization resistanceof the steel surface after addition of inhibitor."

"ABSTRAKInhibisi merupakan salah satu metode penghambatan laju korosi, salah satu jenis dari inhibitor adalah inhibitor organik yang memiliki sifat biodegradable sehingga bersifat lebih ramah lingkungandan relatif lebih murah dibandingkan inhibitor anorganik.Penelitian ini dilakukan untuk mempelajari perilaku inhibisi dari campuran ekstrak ubi ungu (Ipomea batatas) dan kunyit (Curcuma longa) pada pipa baja API-5L di lingkungan NaCl 3,5% dengan menggunakan metode kehilangan berat dan polarisasi. Dalam penelitian ini variasi kadar ekstrak ubi ungu dan kunyit yang dicampur berbanding terbalik. Efisiensi tertinggi ada pada kadar 16 mL ekstrak kunyit dan 2 mL ekstrak ubi ungu dengan efisiensi 82,54% sedangkan kadar optimal yang didapat adalah 8 mL ekstrak kunyit dan 6 mL ekstrak ubi ungu dengan efisiensi 74,2%.

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ABSTRACT Inhibition is one of corrosion protection method, one kind of corrosion inhibitor is organic inhibitor which has biodegradable characteristic thus the inhibitor is environmental friendlier than conventional inorganic inhibitor. This research was done to study the inhibition activity of combination between purple sweet potato (Ipomea batatas) and turmeric (Curcuma longa) extract for API-5L steel pipe in NaCl 3,5% environment. Weight loss and polarization method were used to measure the inhibitor efficiency. In this study concentration variation between purple sweet potato extract and turmeric extract.It was found that the highest efficiency achieved by 16 mL turmeric extract and 2 mL purple sweet potato extract with 82.54% inhibitor efficiency while the optimum concentration achieved by 8 mL of turmeric extract and 6 mL purple sweet potato extract with 74.2% inhibitor efficiency."

"Korosi merupakan degradasi material karena adanya reaksi dengan lingkungan. Korosi penyebab umum kegagalan dalam industri minyak dan gas. Untuk mengurangi laju korosi ini, dikembangkanlah penggunaan suatu inhibitor organik. Bahan organik dipilih sebagai inhibitor karena bersifat aman, mudah didapatkan, biodegradable, murah dan ramah lingkungan. Penelitian dilakukan untuk mengetahui pengaruh penambahan asam askorbat (vitamin C) ke dalam inhibitor ubi ungu dalam larutan NaCl 3,5%. Metode penelitian yang dilakukan adalah dengan pengujian polarisasi, pengujian kehilangan berat, Electrochemical Impedance Spectroscopy (EIS) dan Fourier Transform Infra Red (FTIR). Pengujian EIS bertujuan untuk melihat perubahan nilai tahanan pada inhibitor yang dicampur tersebut. Sedangkan pengujian FTIR dilakukan untuk melihat kandungan yang menginhibisi logam dari inhibitor ubi itu sendiri, maupun setelah pencampuran dengan asam askorbat. Seperti yang diketahui, ubi ungu memiliki senyawa antioksidan di dalamnya yang dapat menghambat laju korosi, yaitu antosianin dan asam askorbat. Penambahan asam askorbat disini bertujuan untuk melihat apakah adanya efek sinergisme apabila inhibitor ini dicampur. Pengaruh konsentrasi asam askorbat salah satu faktor penting yang dibahas dalam penelitian ini, sebab pembentukan lapisan oksida bergantung pada seberapa banyak konsentrasi yang diberikan.

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Corrosion is the material degradation which happens by the cause of reactions with environment . Corrosion is the major cause failure in oil and gas industry. To decrease the corrosion rate, the use of organic inhibitors were developed. Organic compounds were chosen as an inhibitor due to its safety, easily available, biodegradable, low cost and environmentally friendly This study was conducted to study the addition effect of ascorbic acid (vitamin C) on purple sweet potato inhibitor for API-5L pipe steel in NaCl 3.5% solution. Methods which will be used in this study are dynamic polarization, weight loss methods, Electrochemical Impedance Spectroscopy (EIS) and Fourier Transform Infra Red (FTIR).

The purpose of EIS testing is to identify the difference in resistance value on mixed inhibitors. On the other hand, FTIR is conducted in order to indentify compounds which inhibit metals from purple sweet potato and from its mixture. As it has been studied, purple sweet potato has antioxidant compounds which has the ability to prevent corrosion rate, these antioxidants are anthocyanin and ascorbic acid. The addition of ascorbic acid in this study were purposed to identify the sinergestic effect if these inhibitors were mixed. The concentration effect of ascorbic acid is one of the important factor which will be discussed in this research, because the formation of passive oxide layer depends on the addition of certain concentration."

"Korosi merupakan kegagalan yang sering terjadi pada industri minyak dan gas bumi Menghambat terjadinya korosi dengan mengisolir logam dari lingkungan terkorosi pada industri minyak dan gas bumi merupakan salah satu cara efektif untuk menghindari terjadi kegagalan korosi. Penggunaan inhibitor alami menjadi pihan utama belakang ini karena aman murah dan yang terpenting bahan tersebut biodegradable dan tidak berbahaya bagi lingkungan. Penelitian ini dilakukan untuk melihat efek dari penambahan teh rosella merah terhadap inhibitor ubi ungu yang memang dapat digunakan menjadi inhibitor pada baja API 5L pada lingkungan NaCl 3 5. Pengujian ini dilakukan dengan menggunakan metode kehilangan berat dan polarisasi untuk melihat laju korosi yang terjadi pada logam lalu dilengkapi dengan data tambahan yaitu pengujian Electrochemical Impedance Spectroscopy untuk melihat tahan permukaan yang berbubah pada penelitian tersebut. Pengujian Fourier Transform Infra Red juga dilakukan untuk melihat kandungan yang menginhibisi dari ubi ungu ataupun campuran ubi ungu dan teh rosella merah Pemilihan teh rosella merah dan ubi ungu berdasarkan kandungan antocyanin dan asam askorbat yang dimiliki kedua bahan tersebut Kandungan tersebut bersifat anti oksidan yang berarti dapat menghambat terjadi proses oksidasi yang berarti juga dapat mencegah korosi. Kandungan anti oksidan tersebut bekerja dengan cara adsoprsi pada permukaan logam membentuk lapisan tipis untuk mencegah kontak antara permukaan logam dengan lingkungan korosif. Salah satu faktor pembentukan lapisan tipis pada permukaan adalah konsentrasi kandungan tersebut sehingga pengaruh konsentrasi dijadikan acuan pada penelitian ini. Penelitian ini akan dibandingkan dengan inhibitor ubi ungu yang hanya dicampur dengan kandungan asam askorbat saja.

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Corrosion is major cause failure in oil ad gas industry Isolate the metal from corrosion of materials is the most effective way to prevent corrosion for this industry. Nowadays the use of green corrosion inhibitor become a new alternative to achieve that goal it happen because the green inhibitor is safe cheap biodegradable and especially environmental friendly.

This study was conducted to study the effect of addition rosella red tea in purple sweet potato inhibitor which is can be use as inhibitor at API 5L in NaCl 3 5 solution. This study use weight loss and polarization method to see that effect and Electrochemical Impedance Spectroscopy test to prove alteration surface resistance when we add the inhibitor.

Fourier Transform Infra Red test also perform in this study to see which one the chemical substance in purple sweet potato and mixture rosella red tea and purple sweet potato can inhibit corrosion. Purple sweet potato and rosella red tea are selected as corrosion inhibitor in this study because they contain antocyanin and ascorbid acid. They are antioxidant compound which is can inhibit oxidation process it means they can prevent corrosion process. That substance inhibit metal by forming layer and isolate metal surface On the important factor to forming thin layer is concentration of the substance so the concentration substance become variable in this study. In the end this study will compared with the addition ascorbid acid in purple sweet potato"

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Penelitian ini dilakukan untuk mempelajari mekanisme ekstrak daun kelor (Moringa Oleifera) dan ekstrak ubi ungu (Ipomoea Batatas) sebagai inhibitor korosi ramah lingkungan untuk API 5L pada lingkungan 0,2 M HCl. Karakterisasi kedua inhibitor dilakukan dengan pengujian FTIR dan menunjukkan bahwa senyawa yang terdapat pada kedua inhibitor tersebut adalah senyawa flavonoid. Pengujian polarisasi potensiodinamik dan EIS dengan variasi penambahan inhibitor serta campuran antara kedua inhibitor dilakukan untuk mempelajari sifat inhibisi, dari penelitian ini dapat diketahui bahwa masing- masing kedua inhibitor dapat digunakan sebagai inhibitor ramah lingkungan sedangkan campuran antara kedua inhibitor tersebut tidak dapat melindungi logam API 5L pada lingkungan 0,2 M HCl. Dari pengujian polarisasi potensiodinamik menunjukkan bahwa dengan penambahan konsentrasi inhibitor ekstrak daun kelor maka laju korosi akan semakin menurun dan nilai efisiensi inhibisi semakin naik dengan nilai tertinggi adalah 73,08%, sedangkan dengan penambahan konsentrasi inhibitor ekstrak ubi ungu laju korosi semakin turun dengan nilai efisiensi inhibisi maksimal sebesar 65,31%. Namun hasil pengujian polarisasi potensiodinamik untuk kombinasi kedua inhibitor menunjukkan nilai laju korosi yang semakin meningkat. Hasil pengujian EIS menunjukkan bahwa kedua inhibitor ini dapat melindungi logam dengan membentuk sebuah lapisan film yang melapisi permukaan logam. Mekanisme adsorpsi inhibitor menunjukkan sebagai mekanisme adsorpsi secara fisik serta sesuai dengan model dari Langmuir untuk inhibitor ekstrak daun kelor dan Temkin untuk ekstrak ubi ungu.

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This research was conducted to study the mechanism of Moringa Oleifera leaf extract and purple sweet potato extract (Ipomoea Batatas) as green corrosion inhibitors for API 5L in the environment of 0.2 M HCl. The characterization of the two inhibitors was carried out by FTIR testing and showed that the compounds contained in the two inhibitors were flavonoids. Testing of potentiodynamic polarization and EIS with variations in inhibitor addition and mixtures between the two inhibitors was carried out to study the inhibitory properties, from this study it can be seen that each of the two inhibitors can be used as green corrosion inhibitors while the mixture between the two inhibitors cannot protect the API 5L environment of 0.2 M HCl. From the potentiodynamic polarization test showed that by increasing the concentration of Moringa leaf extract inhibitors, the corrosion rate will decrease and the inhibition efficiency value increases with the highest value is 73.08%, whereas with the addition of the purple yam extract inhibitor concentration the corrosion rate decreases with the inhibition efficiency value maximum of 65.31%. However, the results of the potentiodynamic polarization test for the combination of the two inhibitors showed an increasing corrosion rate. The EIS test results show that these two inhibitors can protect the metal by forming a layer of film that lines the metal surface. The adsorption inhibitor mechanism shows as a mechanism of physical adsorption and in accordance with the model from Langmuir for Moringa leaf extract inhibitors and Temkin for purple sweet potato extract.

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