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Abstrak :
Kemampuan ekstrak daun pegagan (Centella asiatica) sebagai inhibitor ramah lingkungan untuk baja J55 di lingkungan air formasi diinvestigasi dengan pengujian polarisasi tafel, weight loss, dan Electrochemical Impedance Spectroscopy (EIS). Senyawa fenolik dan antioksidan yang berperan untuk menginhibisi korosi diinvestigasi melalui pengujian FTIR. Selain itu, lapisan yang terbentuk di permukaan logam juga dipelajari dengan menggunakan Scanning Electron Micsroscope. Variabel yang digunakan adalah konsentrasi inhibitor, yaitu 0 ppm, 100 ppm, 250 ppm, 500 ppm, dan 1000 ppm. Ekstrak daun pegagan yang mempunyai gugus fenolik merupakan inhibitor jenis campuran, dan dominan anodik. Efisiensi inhibisi paling tinggi didapatkan dengan konsentrasi 250 ppm. Inhibitor ekstrak daun pegagan dapat digunakan sebagai alternatif inhibitor ramah lingkungan untuk baja J55 pada lingkungan air formasi.

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This study aimed to investigate the ability of Centella asiatica leaves extract as an environment friendly inhibitor for J55 steel in produce water environment. Corrosion inhibition ability of this extract was tested using tafel polarization, weight loss and electrochemical impedance spectroscopy methods. FTIR test was used to investigate phenolic and antioxidant compound that plays an important role to inhibit corrosion. In addition, formed layer on the metal surface was also studied using scanning electron microscope. In this study the concentration of Centella asiatica extract used was 0 ppm, 100 ppm, 250 ppm, 500 ppm, and 1000 ppm. It can be concluded that Centella asiatica extract could be used as an alternative and environmental friendly inhibitor for J55 steel in produce water environment.

Abstrak :
Studi pada pengujian ini dilakukan untuk menginvestigasi pengaruh konsentrasi dari inhibitor ekstrak daun pegagan (Centella asiatica) pada baja 3% krom di lingkungan air formasi. Ketahanan korosi dan kemampuan inhibisi korosi diuji dengan metode polarisasi elektrokimia, electrochemical impedance spectroscopy, dan uji rendam di dalam larutan air formasi. Senyawa-senyawa yang menghambat korosi dari ektrak inhibitor ini diidentifikasi melalui pengujian FTIR dan karakteristik produk korosi yang terbentuk diinvestigasi dengan Scanning Electron Microscopy (SEM). Konsentrasi inhibitor yang digunakan dalam pengujian ini adalah 0 ppm, 100 ppm, 250 ppm, 500 ppm, dan 1000 ppm. Hasil yang didapatkan mengindikasikan ekstrak daun Centella asiatica dapat digunakan untuk menghambat korosi pada baja 3% krom di lingkungan air formasi. ......The present study was carried out to investigate the effect of concentration of Centella asiatica leaves extract inhibitor for 3% Cr steel in produce water environment. The corrosion resistance and corrosion inhibition ability was tested by electrochemical polarization measurements, electrochemical impedance spectroscopy, and immersion tests in a produced water solution. The compounds that inhibit corrosion in this inhibitor extract is identified by FTIR test and the characteristic of corrosion scales are investigated by Scanning Electron Microscopy (SEM). The concentration of inhibitor extract which was used in this study is 0 ppm, 100 ppm, 250 ppm, 500 ppm, and 1000 ppm. The results indicate that Centella asiatica extract can be used to inhibit corrosion for 3% Cr steel in produced water environment.

Abstrak :
Telah dilakukan penelitian untuk mengetahui pengaruh air formasi berinhibitor terhadap perilaku korosi dan laju korosi baja API 5L Grade B. Metode yang digunakan yaitu Weight loss dan Polarisasi Potensiodinamik. Uji celup dilakukan dengan variasi waktu 8, 11, dan 14 hari. Hasil penelitian menunjukkan bahwa kondisi baja API 5L dalam larutan air formasi berinhibitor mengalami pemasifan dan laju korosi semakin menurun seiring pertambahan waktu. Hasil pengujian XRD menunjukkan bahwa produk korosi yang dihasilkan adalah Fe3O4. ......A research has been conducted to know the influences formation water with presence of inhibitor to the corrosion behaviour and corrosion rate API 5L Grade B steel. Weight loss and Potentiodynamic Polarization methodology has been carried out. An immersion test with various time 8,11, and 14 days has been done. This research has show that passivity happened and the corrosion rate has decreased as the increased of time. The corrosion product of Fe3O4 has been known as the result of XRD test.