Abstract:

The inhibition mechanism of polyaspartic（PASP）on copper electrode in a borax buffer solution was studied by the photocurrent response method. The copper electrode in a borax buffer solution showed p-type photocurrent response which came from Cu₂O layer on its surface. The photocurrent response during cathodic polarization became bigger when inhibitor PASP which could be adsorbed on the Cu electrode and make Cu₂O layer thicker was added. The bigger the photocurrent response，the better the inhibition effect. When adding PASP with a concentration of 3 mg·L^-1，the photocurrent response was the biggest and inhibition of copper corrosion was the best. Cl^- could prevent PASP from being absorbed and make Cu₂O layer unprotected，resulting in worse inhibition.