Stress-corrosion tests on high-strength aluminum alloy sheet

Abstract

This paper describes stress-corrosion tests on high-s trength aluminum alloy sheet. The materials inves tigated were 248-T , aged 0 to 12 hours at 375 0 F ; R301-T ; bare and elad 758-T ; bare and clad R303-T275: and bare and clad R303-T315 alloys. The material s were exposed unst ressed and stressed in t ension to three-quarters of the yield s trength in a sodium chlori de-hyd rogen peroxide solution and in a marine atmosphere. Th e zin c bearing alloys, 758-T a nd R303-T , were a lso exposed, while stressed by bowing, in a boiling 6-perce nt NaCI solu tion. Corrosion damage wa evaluted from losses in t ensile s trength and elongation . Commercial 248-1' material, aged 4 hours or longer , and the other alloys as supplied by the manufacturers, with th e ex ception of th e R301-T alloy, were resistant to s tresscorrosion cracki ng.