ELECTROCHEMICAL EXAMINING OF CYSTINE AND CYSTEINE AS GREEN CORROSION INHIBITORS FOR 7075 ALUMINIUM ALLOY

Abstract

The corrosion inhibition performance of cystine and cysteine as green inhibitors for 7075-T6 aluminium alloy in 0.1 M NaCl solution was investigated and compared. Inhibitive efficiency was evaluated using linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS). Various inhibitor concentrations were examined to assess their effectiveness. Surface analysis of the aluminium alloy before and after electrochemical testing was conducted using scanning electron microscopy (SEM). The findings indicate that both cystine and cysteine effectively inhibit corrosion, though their protection mechanisms vary. Cysteine demonstrated higher efficiency for short-term corrosion inhibition, while cystine provided more durable, long-term protection.