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"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."

"Justifikasi beras ketan hitam sebagai inhibitor organik ditentukan dengan membandingkan laju korosi baja SPCC yang diuji rendam di larutan HCl 0,1 M dengan dan tanpa penambahan beras ketan hitam 500 gpl. Hasilnya beras ketan hitam dapat menekan laju korosi dengan efisiensi 63,952 - 81,2412 % selama waktu uji rendam 3 - 7 hari. Penelitian ini merupakan penelitian tahap awal sehingga mekanisme penghambatannya secara mendetail tidak mencakup bagian dari penelitian ini. Namun pendekatan secara elektrokimia dilakukan untuk membantu justifikasinya dan meramalkan mekanisme yang terjadi dari perubahan potensial logam dan pH larutan. ......Justification black glutinous rice as an organic inhibitor was determined by comparing corrosion rate of immersed SPCC steel in 0.1 HCl solution with and without addition of 500 gpl black glutinous rice. The result black glutinous rice can inhibit corrosion rate of SPCC steel with the efficiency reaches 63,952 - 81,2412 % during 3 - 7 days of immersion test duration. This study was a early stage research so its detailed inhibition mechanism beyond this study objectives. But electrochemically approach study was done to help its justification and predicted the mechanism it took out of the changing of steel potential and pH solution."

"Penggunaan ekstrak ubi ungu sebagai inhibitor organik untuk material baja karbon rendah di lingkungan air laut pada temperatur 40oC telah diteliti dapat melindungi baja dari korosi. Ekstrak ubi ungu yang mengandung senyawa antioksidan yang berupa senyawa antosianin diharapkan dapat digunakan sebagai inhibitor organik yang bersifat ramah lingkungan. Metode kehilangan berat untuk menguji efektivitas ekstrak ubi ungu sebagai inhibitor dengan variasi konsentrasi (0, 0,44%, 0,89%, dan 1,33%) dan lama waktu perendaman selama 4 hari, memberikan hasil yang cukup baik untuk menghambat laju korosi pada baja karbon rendah dengan efisiensi sebesar 11,40%-41,13%. ......The using of extract purple potatoes as organic inhibitor for low carbon steel material in seawater environtment at 40oC operating temperature had been tested that it can used to protect steel from corrosion. Extract of purple potatoes which contain antioxidant are expected can be used as a eco-friendly organic inhibitor. Weight loss method that applied to test the effectiveness of extract purple potato as inhibitor with different concentration of extract purple potato (0%, 0,44%, 0,89%, 1,33%) and the immersion time is 4 days long, give a good result that it can inhibit corrosion rate of low carbon steel with vary efficiency, from 11,40% to 41,13%."