Understanding stress corrosion cracking behavior of 7085-T7651 aluminum alloy in polluted atmosphere  

作　　者：Mingtao WANG Liwei WANG Kun PANG Yuxi LIU Yuxue WANG Zhongyu CUI 

机构地区：[1]College of Mechanical and Electrical Engineering,Qingdao University,Qingdao 266071,China [2]School of Materials Science and Engineering,Ocean University of China,Qingdao 266100,China

出　　处：《Chinese Journal of Aeronautics》2023年第8期408-421,共14页中国航空学报（英文版）

基　　金：support of the Ministry of Industry and Information Technology Project,China(No.MJ-2017-J-99);the National Science Foundation of China(No.51701102);the National Science and Technology Resources Investigation Program of China(No.2019FY101400).

摘　　要：The electrochemical and Stress Corrosion Cracking(SCC)behaviors of 7085-T7651 aluminum alloy in different environments are studied by electrochemical and mechanical testing.The research shows that the type,concentration of the corrosive medium and electrolyte state affect the electrochemical and SCC controlling processes of aluminum alloys.The Thin Electrolyte Layer(TEL)state and the addition of HSO3–increase the corrosion rate and SCC susceptibility.The presence of HSO3–in a corrosive environment can significantly accelerate the corrosion rate and mechanical property degradation,and this effect increases with the increase of HSO3–concentration.Compared with the solution environment,the TEL environment will further aggravate corrosion and mechanical property degradation.With the increase of HSO3–concentration,the pH of the corrosive environment exhibits little change,while the SCC degradation is significantly promoted.This is attributed to the HSO3–induced buffer effect and film-assisted stress effect,yielding the overshadowing effect against solution pH.

关 键 词：ALUMINUM Atmospheric corrosion FRACTOGRAPHY Hydrogen embrittlement Stress corrosion cracking 

分 类 号：V252[一般工业技术—材料科学与工程]