Amino acids as copper corrosion inhibitors in 0.05M HCl

Abstract

Increased concern of professional and scientific community for the environment has led to the increased utilization of environmentally friendly inhibitors for the protection of metals from corrosion. This paper investigates the possibility of using various amino acids as 'green' corrosion inhibitors for copper in 0.05 M HCl solution. The inhibitory properties of various concentrations of cysteine, methionine and alanine in 0.05 M hydrochloric acid solution on copper electrode have been evaluated, using the following methods: measuring open circuit potential (OCP), linear scan voltammetry (LSV) and cyclic voltammetry techniques (CVs). It has been established that cysteine (1·10-2M) has the best inhibitory potential.