Anodic Corrosion Characteristics of Aluminum 7075 and 7178

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Abstract
High-strength alloys 7075 and 7178 are widely used now in the −T6 tempers by the aerospace industry. Several more corrosion-resistant tempers have been developed recently: 7075–T73 (stress corrosion resistant) and 7075–T76 and 7178–T76 (exfoliation resistant). Electrochemical characteristics as determined by “dynamic” (current versus potential) and “static” (current versus time) tests were found to correlate well with their performance in accelerated corrosion and natural environment marine tests. Attack on the −T6 temper was found to be localized in nature, while that on the resistant tempers (−T76 and −T73) was general, showing crystallographic form. The −T6 tempers polarized more rapidly and were less active than the −T76 or −T73 tempers. Anodic control of the corrosion process is postulated to be more important in 7075 than in the more highly alloyed 7178; the latter showing mixed anodic-cathodic control.

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