Abstract
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).
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Funded by the National Natural Science Foundation of China (No. 51371039)
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Qi, X., Song, R., Qi, W. et al. Correspondence between susceptibility to SCC of 7050 aluminum alloy and passive film-induced stress at various pH values. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 32, 173–178 (2017). https://doi.org/10.1007/s11595-017-1576-z
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DOI: https://doi.org/10.1007/s11595-017-1576-z