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"ABSTRAKUbi ungu merupakan salah satu bahan organik yang dapat dikembangkan sebagai inhibitor untuk mengurangi laju korosi pada baja karbon rendah di lingkungan air laut. Inhibitor ubi ungu diharapkan akan menjadi inhibitor yang aman digunakan, ramah lingkungan, murah serta bio-degradable. Metode polarisasi digunakan untuk mengetahui kadar penggunaan yang optimal dari inhibitor ubi ungu dengan variasi konsentrasi 2ml, 4ml, 6ml, dan 8ml. Hasil yang diperoleh menunjukkan bahwa ekstrak ubi ungu cukup efektif sebagai inhibitor dalam menghambat laju korosi baja karbon rendah di lingkungan NaCl 3,5%. Ekstrak ubi ungu bekerja cukup optimal dan mampu menghambat laju korosi hingga 79,4%.

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ABSTRACTPurple potatoes is one of the organic material that can be developed as an inhibitor to reduce the rate of corrosion in low carbon steel in sea water environment. Inhibitors of purple potatoes extract are expected to be safe to be used, environmentally friendly, cheap and bio-degradable. Polarization method is used to determine optimal levels of use of inhibitors of purple potatoes with various concentration of 2ml, 4ml, 6ml and 8ml. The results showed that the purple potatoes extract is effective as an inhibitor in inhibiting low carbon steel corrosion rate in environment of 3.5% NaCl. Purple potatoes extract works are optimal and can inhibit the corrosion rate up to 79.4%."

"ABSTRAKPerbedaan konsentrasi yang ditambahkan pada baja karbon rendah mempengaruhi perilaku inhibisi ekstrak ubi ungu dalam larutan NaCl kadar 3,5% pada temperatur 500C telah dilakukan penelitian dengan menggunakan metode kehilangan berat. Ekstrak ubi ungu sebagai green inhibitor digunakan karena mengandung senyawa antioksidan yang dapat menghambat laju korosi. Pada penelitian ini, waktu perendaman sampel baja karbon rendah untuk semua konsentrasi sama, yaitu selama 4 hari. Hasil penelitian menunjukkan ubi ungu sebagai inhibitor korosi efektif untuk baja karbon rendah dalam larutan NaCl kadar 3,5% pada temperatur 500C, karena dapat menghambat laju korosi secara cukup baik dengan efisiensi sebesar 21,3-31,27 % dengan penambahan konsentrasi ekstrak ubi ungu sebesar 4-6 ml.

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ABSTRACTThe differences of concentration were added on low carbon steel affecting the behavioral inhibition of purple sweet potato in NaCl solution levels of 3,5% has been investigated using weight loss method. Purple sweet potato extract as green inhibitor is used because contains of antioxidant compounds that can be inhibiting the corrosion rate. In this experiment, the immersion time of low carbon steel for all the conditional concentrations are equal, it?s about 4 days. Results of this experiment showed that purple sweet potato extract as corrosion inhibitor is effective for low carbon steel in NaCl solution levels of 3,5% at temperature 500C because can be inhibiting corrosion rate fairly with an efficiency of 21,3-31,27% with addition concentration of purple sweet potato are 4-6 ml. "

"Ekstrak ubi ungu dikembangkan sebagai inhibitor organik untuk mengurangi laju korosi pada baja karbon rendah di lingkungan NaCl 3,5%. Penelitian telah dilakukan dengan perbedaan waktu perendaman (3,6,9,dan 12 hari) menggunakan metode kehilangan berat. Konsentrasi inhibitor ekstrak ubi ungu yang digunakan pada semua waktu perendaman sebesar 6 ml. Ekstrak ubi ungu memiliki zat antosianin yang berfungsi sebagai antioksidan untuk menghambat laju korosi. Ekstrak ubi ungu kurang efektif sebagai inhibitor organik pada lingkungan NaCl 3,5% dengan efisiensi 37,63%-43,42% selama waktu uji 3-12 hari dengan efisiensi maksimum pada waktu perendaman 9 hari.

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Purple sweet potato extract was developed as an organic inhibitor to reduce the rate of corrosion in low carbon steel in NaCl 3.5% environment. Research has been conducted with different immersion time (3,6,9, and 12 days) using weight loss methode. Concentration of inhibitor purple sweet potato as much as 6 ml for all immersion time. Purple sweet potato extract is a substance that anthocyanins act as antioxidants to inhibit the rate of corrosion. Purple sweet potato extract is less effective as an organic inhibitor in NaCl 3.5% environment with efficiency of 37.63%-43.42% during the test period 3-12 days with maximum efficiency in 9 days."

"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."

"[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.]"

"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."

"ABSTRAKPenelitian ini dilakukan untuk menganalisa pengaruh inhibisi ekstrak cair daunBeluntas (Pluchea Indica Less.) terhadap korosi pada baja karbon rendah dilingkungan 3,5% NaCl. Penelitian dilakukan menggunakan pengujian weight loss,polarisasi, dan Fourier transform infrared spectroscopy (FTIR). Pengujian weightloss menunjukkan bahwa perendaman selama 9 hari dengan penambahan ekstraksebanyak 3 mL memberikan nilai rata-rata efisiensi paling maksimum sebesar75,97% dengan rata-rata laju korosi paling minimum sebesar 0,89 mpy. Pengujianpolarisasi menunjukkan terjadi pergeseran kurva ke arah anodik pada penambahanekstrak sebanyak 1,2,3 mL, dan bergeser ke arah katodik pada penambahansebanyak 4 mL. Penambahan ekstrak berpengaruh terhadap penurunan laju korosiyaitu dari 24,8 µA.cm-2 menjadi 5,04 µA.cm-2, sehingga memperkuat hasilpengujian weight loss bahwa ekstrak daun Beluntas dapat menghambat korosibaja karbon rendah di larutan 3,5% NaCl. Pengujian polarisasi menunjukkanbahwa ekstrak daun Beluntas memiliki tipe inhibisi campuran (mixed) dengankecenderungan lebih dominan kearah anodik berdasarkan nilai potensial korosiyang berubah secara acak. Pengujian FTIR menunjukkan bahwa estrak daunBeluntas teradsorpsi pada permukaan baja karbon rendah dan proses adsorpsinyaterjadi melalui gugus fungsi yang dimiliki ekstrak. Mekanisme adsorpsi ekstrakdaun Beluntas sesuai dengan Langmuir adsorption isotherm yang menunjukkanbahwa telah terjadi pembentukan lapisan monolayer di permukaan baja karbonrendah.

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ABSTRACTThe study was conducted to analyze the inhibition effect of Beluntas (Plucheaindica Less.) leaves extract on the corrosion of low carbon steel in 3.5% NaClenvironment. The study was invetigated by weight loss, polarization, and Fouriertransform infrared spectroscopy (FTIR) methods. Weight loss showed that soakingfor 9 days with the addition of 3 mL of the extract gave an average value of themaximum efficiency of 75.97% with an average of the minimum corrosion rate of0.89 mpy. Polarization shows the polarization curve shifts to the anodic directionin addition of 1,2,3 mL extract, and shifted toward the cathodic curve to theaddition of 4 mL. The presence of inhibitor causes decrease in the corrosion ratefrom 24.8 to 5.04 μA.cm-2, thus confirm the results of weight loss that Beluntasleaves extract can inhibit the corrosion of low carbon steel in 3.5% NaCl solution .The polarization showed that the Beluntas leaves extract acts through mixed modeof inhibition, as evident from the values of Ecorr, which do not increase or decreasein a regular manner from the blank value. FTIR showed that the Beluntas leavesextract adsorbed on the surface of low carbon steel and the process of adsorptionoccurs through a functional group extract. Beluntas leaves extract showsLangmuir adsorptions isotherm that indicated the monolayer formation on the lowcarbon steel surface."

"Ekstrak kulit kentang diteliti sebagai inhibitor korosi ramah lingkungan pada baja karbon di lingkungan 3,5% NaCl menggunakan uji kehilangan berat, polarisasi, dan Fourier transform infrared spectroscopy. Pada pengujian kehilangan berat menunjukkan konsentrasi 6mL memberikan nilai efisiensi paling optimal sebesar 73,33 % dengan laju korosi paling rendah sebesar 1,59 mpy. Pada pengujian polarisasi terjadi penurunan rapat arus korosi sebesar 9.79 µA/cm2 menjadi 3.27 µA/cm2, sehingga memperkuat hasil uji kehilangan berat bahwa ekstrak kulit kentang dapat menghambat korosi baja karbon rendah pada lingkungan 3,5% NaCl. Penambahan ekstrak kulit kentang menyebabkan pergeseran potensial korosi (Ecorr) mengarah kearah anodik dengan tipe inhibisi campuran (mixed). Pengujian FTIR menunjukkan ekstrak kulit kentang teradsorpsi pada permukaan baja karbon rendah melalui gugus fungsi yang dimiliki ekstrak. Mekanisme adsorpsi ekstrak kulit kentang mengikuti Langmuir adsorption isotherm yang mengindikasikan terbentuknya lapisan monolayer pada permukaan baja karbon rendah.

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Potato peel extract as green corrosion inhibitor on low carbon steel in 3.5% NaCl environment has been investigated using weight loss, polarization, and fourier transform infrared spectroscopy. The result of weight loss that showed that optimum inhibition is 73,33% in 6 mL concentration with corrosion rate 1,59 mpy and 9 days of immersion time.

Polarization show that decrease in current density 9.79 to 3.27 µA/cm2, with the result that confirm the results of weight loss that potato peel extract inhibit corrosion low carbon steel on 3.5% NaCl environment. Additional of potato peel extract showed displacement of potential corrosion to anodic direction, and act as mixed type inhibition.

FTIR showed that potato peel extract adsorbed to surface of low carbon steel through functional group extract. The mechanism of adsorption followed the Langmuir isothermal adsorption which indicated formation of monolayer film on low carbon steel surface."

"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"

"ABSTRAKPerilaku inhibisi teh bunga rosella berdasarkan pengaruh perbedaan konsentrasi yang ditambahkan (2 ml, 4 ml, 6 ml dan 8 ml) pada baja karbon rendah di lingkungan NaCl 3.5 % telah diteliti dengan menggunakan metode polarisasi. Ekstrak ubi ungu dipilih sebagai green corrosion inhibitor karena mengandung senyawa antioksidan yang dapat menghambat laju korosi. Waktu pengujian sampel baja SPCC untuk semua penambahan konsentrasi adalah sama. Hasil penelitian menunjukkan teh bunga rosella merupakan inhibitor korosi yang efektif untuk baja karbon rendah di lingkungan korosif, karena dapat menghambat laju korosi dengan efisiensi sebesar 57.32 - 59.31 % dengan penambahan konsentrasi 2 - 8 ml teh bunga rosella.

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ABSTRACTBehavioral inhibition of rosella flower tea based on the effect of different concentrations were added (2 ml, 4 ml, 6 ml and 8ml) on low carbon steel sample in NaCl 3.5 % environment has been investigated using polarization method. Rosella flower tea is selected as green corrosion inhibitors because they contain antioxidant compounds that can inhibit the corrosion rate. SPCC steel sample immersion time for all the additional concentrations are equal, ie for 5 days. Results showed rosella flower tea is effective corrosion inhibitor for low carbon steel in corrosion environment, because it can inhibit the corrosion rate with an efficiency of 57.32 - 59.31 % with the addition of rosella flower tea concentration of 2-8 ml."