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Abstrak :
Inhibitor ramah lingkungan saat ini diperlukan untuk mengurangi dampak pencemaran dari inhibitor anorganik. Penelitian ini mempelajari pengaruh injeksi ekstrak daun sirsak dengan pelarut tiga tingkat sebagai inhibitor organik terhadap baja karbon rendah API 5L grade A dalam larutan air terproduksi. Berdasarkan pengujian weight loss dari seluruh sampel uji, sampel 8 hari dengan penambahan inhibitor 2 ml menunjukan nilai efisiensi paling tinggi yakni sebesar 52.62 %. Hasil uji polarisasi dan EIS dengan pelarut tiga tingkat didapatkan pelarut etanol mempunyai nilai efisiensi paling besar: 88.52%, sedangkan pelarut semi polar dan non polar nilai efisiensi nya hampir sama. Data dari EIS menunjukkan tahanan larutan menjadi turun dengan semakin meningkat nya penambahan inhibitor ekstrak daun sirsak. Uji FTIR memperlihatkan bahwa terdapat gugus fungsi dari ekstrak daun sirsak dan senyawa aktif nya adalah tipe polifenol. ......Green inhibitors are now increasingly needed to reduce the adverse environmental impacts of the inorganic inhibitor. This research studied the effects of injection of soursop leaves extract in three-level solvents (polar, semi polar and non polar) as an organic inhibitor for the low-carbon steel API 5L of grade A in produced water solution. Based on weight loss test of the entire sample, the 8 days's sample with addition of 2 ml inhibitor from soupsop leaves extract showed the highest efficiency value which amounted to 52.62%. The polarization and EIS tests for three levels's solvents show that the ethanol solvent (type of polar) has the greatest efficiency values: 88.52%, while the efficiency value of non-polar and semi-polar solvent is almost without difference. EIS data showed that inhibiting power of the solution decreases when the inhibitor of soursop leaves extract is increasingly added. FTIR test showed that there is a functional group in the soursop leaves's extract and the active compound is a kind of polyphenol.

Abstrak :
Tesis ini mempelajari mengenai pengaruh injeksi ekstrak Andaliman dan Alpha-Tocopherol sebagai green corrosion inhibitor pada baja API 5L dalam larutan HCl 1M. Dengan pengujian weight loss diperlihatkan bahwa inhibitor campuran antara ekstrak Andaliman dan Alpha-Tocopherol mampu menurunkan laju korosi dengan efisiensi 92.07 pada konsentrasi inhibitor 2 ml Andaliman 0.5 ml Alpha-Tocopherol. Dari pengujian polarisasi ditunjukkan bahwa inhibitor campuran antara ekstrak Andaliman dan Alpha-Tocopherol menggeser kurva polarisasi kearah atodik dan katodik mixed type inhibitor , yang menunjukkan ciri utama sebagai inhibitor dari bahan organik. Pengujian dengan FTIR dan GCMS memperkuat dugaan bahwa inhibitor ekstrak Andaliman dan Alpha-Tocopherol sebagai inhibitor adsorpsi/film forming. ......This thesis is intended to study the influences of Andaliman extract and Alpha- Tocopherol injection as green corrosion inhibitor for API 5L steel in HCl 1M solution. By weight loss analysis, it show that mixed inhibitor from andaliman extract and Alpha-Tocopherol can reduce corrosion rate with efficiency up to 92.07 % under inhibitor injection about 2 ml Andaliman + 0.5 ml Alpha- Tocopherol. By polarization, it is shown that inhibitor shift polarisation curves for both of anodic and cathodic polarisation (mixed type inhibitor), shows that inhibitor have characteristic as inhibitor from organic material. By FTIR and GCMS analysis can be concluded that inhibitor from Andaliman and A- Tocopherol act inhibition by adsorption/film forming corrosion inhibitor.