Electrochemical Behaviors and Stress Corrosion Cracking of 5083 Aluminum Alloy

5083 合金の電気化学的挙動と応力腐食割れ

Electrochemical Behaviors and Stress Corrosion Cracking of 5083 Aluminum Alloy

Creators Osaki Shuhei

Strained electrode reactions 5083 aluminum alloy exposed to chloride solutions were studied as a function of stress, strain, electrode potential, solution pH and microstructure by means of an Instron-type tensile test machine. The results obtained are as follows : 1) There is a good correlation between the stress-corrosion susceptibility and change of natural electrode potential followed over a long time. 2) An increase in rate of anodic reaction is observed on application of plastic strain. 3) The susceptibility to stress-corrosion cracking increases remarkably with anodic polarization and decreases with cathodic polarization at slightly negative potential from the natural electrode potential. 4) The stress-corrosion cracking may be caused by anodic dissolution at grain boundaries with β precipitate.

[ISSN]0372-7661

[NCID]AN00244228