Correspondence between susceptibility to SCC of 7050 aluminum alloy and passive film-induced stress at various pH values

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• 作者：Xing Qi 祁星 ; Renguo Song 宋仁国 ; Wenjuan Qi…
• 关键词：Key words7050 aluminum alloy ; susceptibility to SCC ; pH value ; passive film ; induced stress
• 刊名：Journal of Wuhan University of Technology-Mater. Sci. Ed.
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：32
• 期：1
• 页码：173-178
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science, general;
• 出版者：Wuhan University of Technology
• ISSN：1993-0437
• 卷排序：32

文摘

The passive film-induced stress and the susceptibility to SCC of 7050 aluminum alloy in 3.5% sodium chloride solution at various pH values were investigated by slow strain rate testing (SSRT) and flowing stress differential method. The results showed that the passive film-induced stress and the susceptibility to SCC decreased with increasing pH values when pH≤7, while they increased with increasing pH values when pH >7. However, the corrosion type was interpreted as exfoliation corrosion when pH=1 and 14, and there was no film formed on the surface of the specimens. The whole variation plots of film-induced stress and the SCC susceptibility with pH values were both presented as a valley shape. The symbol and amount of the film-induced stress were related to the compositions of the passive film, which were analyzed using X-ray photoelectron spectroscopy (XPS).