Modeling pit initiation rate as a function of environment for Aluminum alloy 7075-T651
By Cavanaugh, M.K.; Birbilis, N. & Buchheit, R.G.
Published in Electrochimica Acta
NULL
2012
Abstract
Pit initiation in AA7075 was characterized by measuring metastable pits from potentiostatic testing. Environmental conditions included a range of temperatures (0–60 °C), chloride concentration (0.01–0.6 M), electrolyte pH (2.5–10) and electrochemical potential (E). Metastable pit initiation rate, λ, was shown to have a dependence on all environmental variables, which is highly relevant to practical service. As a result of the wide variation in λ, an artificial neural network (ANN), rather than a deterministic model, was utilized to model λ as a function of environment. Additionally, the significant body of results herein sheds light on the general pitting characteristics of such high strength Al-alloys in a quantitative sense – whereby T, pH, and [Cl-] were all deemed significant parameters in accurately determining λ.
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