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

Xing Qi; Renguo Song; Wenjuan Qi; Jirong Jin; Chao Wang; Hai Li; Bin Sun

doi:10.1007/s11595-017-1576-z

Journal of Wuhan University of Technology Materials Science Edition ›› 2017, Vol. 32 ›› Issue (1) : 173 -178. DOI: 10.1007/s11595-017-1576-z

Metallic Materials

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

Xing Qi ¹^,²^,³
, Renguo Song ¹^,²^,³^,^{^b}
, Wenjuan Qi ¹^,²^,³
, Jirong Jin ¹^,²^,³
, Chao Wang ¹^,²^,³
, Hai Li ¹^,²^,³
, Bin Sun ¹^,²^,³

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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).

Keywords

7050 aluminum alloy / susceptibility to SCC / pH value / passive film-induced stress

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Xing Qi, Renguo Song, Wenjuan Qi, Jirong Jin, Chao Wang, Hai Li, Bin Sun. Correspondence between susceptibility to SCC of 7050 aluminum alloy and passive film-induced stress at various pH values. Journal of Wuhan University of Technology Materials Science Edition, 2017, 32(1): 173-178 DOI:10.1007/s11595-017-1576-z

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