抄録
Etch-pits of various shapes are formed when aluminum is anodically dissolved in chloride solutions. Studies were conducted on predicting by computer simulation the morphology of etch-pits formed under various conditions.
When a global dissolution model was assumed for the reaction initiating the pitting, initial pit depth and the number of pits increased with increases in temperature and time. When on the other hand, a local dissolution model was assumed for pit growth, pit depth increased with increases in temperature, current density and time, and with decreases in pit diameter.
An aluminum specimen of 99.99% purity was electrolytically etched in HCl solution for comparison with the computer simulation results, and the experimental results showed good agreement with these.
