Corrosion of Al and Al Alloys in Cl^－ and Cu^2＋ Ion-containing Solutions at 363 K

― Effects of Inhibitor Addition on the Corrosion Behavior ―

Abstract

Effects of an inhibitor on the corrosion of Al and Al alloys in Cl^－ and Cu^2＋ solutions at 363 K have been investigated by gravimetry and analyses of surfaces and vertical cross sections of specimens with a scanning electron microscope and an energy dispersive X-ray spectrometer. Addition of the inhibitor to the Cu^2＋ solution inhibited effectively the corrosion of Al and Al alloys, while inhibitor addition to the Cl^－ solution didnʼt at all. The inhibitive effect in the Cu^2＋ solution can be explained in terms of the SiO₂ film formation on the specimen, leading to the suppression of Cu deposition.