Open AccessInfluence of Interfacial Stress Produced by MAO on Electrochemical Corrosion and Stress Corrosion Cracking Behavior in 7075 Aluminum Alloy
Author(s) -
Xing Qi,
Renguo Song,
Chao Wang,
Bo Jiang
Publication year - 2022
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/ac534b
Subject(s) - materials science , corrosion , stress corrosion cracking , metallurgy , alloy , composite material , foil method , coating , ultimate tensile strength , compressive strength , stress (linguistics) , environmental stress cracking , penetration (warfare) , electrochemistry , electrode , chemistry , linguistics , philosophy , operations research , engineering
The interfacial stresses of micro arc oxidation (MAO) coated 7075 Al alloy foil samples were measured by a deflection method. The results showed that compressive stresses were generated on the substrate-coating interface of the samples coated for different oxidation times. Electrochemical tests and slow strain rate tensile tests in a 3.5 wt% sodium chloride solution indicated that the compressive stress played a positive role in corrosion and stress corrosion cracking (SCC) resistance. The findings of this work indicated that the MAO coating can not only act as a protective layer to hinder corrosive solution, but also the compressive stress generated during MAO process can offset part of the external stress and reduce the hydrogen penetration during SCC.