Mechanically assisted corrosion oxidative

The abrasive-free slurry approach relies on modification of the Cu-oxide layer to a copper complex layer with different chemical and mechanical properties that facilitate removal without assistance fi om abrasives. The abrasive-free polishing solutions are complex, and optimization requires understanding the impact of each component (oxidizer, complexing agent, corrosion inhibitor, and pH adjustor) on the Cu-complex formation and defectivity. 

Mechanical or thermal stresses are most likely responsible for this network of cracks within the oxide product. The mechanism appears to be stress-assisted locahzed corrosion. Sharp, tight cracks were not found in fresh metal beyond the periphery of the oxide corrosion product. It therefore appears reasonable that cracking could have occurred subsequent to corrosion and within the brittle oxide. 

Schematic of the crack enclave and the relevant phenomena associated with the slip-oxidation mechanism of crack advance. (Adapted from Ford, F.P., The crack tip system it s relevance to the prediction of cracking in aqueous environments, in Proceedings cf First International Conferemx on Environmentally Assisted Cracking cf Metals, Kohler, Wl, October 2-7, 1988, Eds. R. Gangloff and B. Ives, Published by NACE, pp. 139-165 Ford, F.P. et al.. Corrosion-assisted cracking of stainless steel low-alloy steels in LWR environments. Report NP5064S, February 1987, EPRI, Palo Alto, CA.)...

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