Exploration of Eucheuma Seaweed Algae Extract as a Novel Green Corrosion Inhibitor for API 5L Carbon Steel in Hydrochlorid Acid Medium

Regarding the issue of green chemistry and the vision of human sustainability, a novel corrosion inhibitor for API 5L carbon steel was explored from Eucheuma seaweed algae. The inhibiting performance of Eucheuma extract was studied by electrochemical measurement such as potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). In this work, FTIR also employed to confirm the main phenolic compounds of Eucheuma extract. Electrochemical measurement result inidcated that the Eucheuma extract was an efficient corrosion inhibitor in reducing corrosion attack of API 5L carbon steel in hydrocholoric acid medium. The improved corrosion resistance is attributed to the complicate items including extract concentration and holding time. It was found that the Eucheuma extract was a mixed type corrosion inhibitor that inhibit both the cathodic and anodic corrosion reaction. This study was helpful to discover the seaweed algae that was abundant in Indonesian’s marine for inhibiting corrosion of API 5L carbon steel in aggressive environment.