The Electrochemistry of an Al-Zn-Mg-Cu Alloy in Simulated Crack-Tip Solutions

摘要

Mechanistic understanding of intergranular (IG) environment-assisted cracking (EAC) of Al-Zn-Mg-Cu alloys in aqueous chloride solutions is lacking in part because the crack-tip electrode kinetics are not well known. The objective of this work was to characterize the alloy electrode kinetics in simulated crack-tip solutions. This work is part of a larger study examining the crack chemistry and electrochemistry of aluminum association (AA) 7050 to help elucidate the relative contribution hydrogen embrittlement (HE) and anodic dissolution (AD) to the crack advance process. ~(1-3) The crack chemistry and electrode potential have been described.