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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=l 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).
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 = l and 14, and there was no film formed on the surface of the specimens. whole variation plots of film-induced stress and the SCC susceptibility with pH values were both presented as a valley shape. symbol and amount of the film-induced stress were related to the compositions of the passive film, which was analyzed using X-ray photoelectron spectroscopy (XPS).