The filiform corrosion behaviour of hot‐rolled AA3104 aluminium alloy was investigated in the presence of a near‐surface deformed layer produced by hot rolling. Through detailed examination of microstructure of the near‐surface deformed layer and observation of the propagation behaviour of filiform corrosion, it was found that lateral development of surface‐active filiform corrosion in the deformed layer was promoted by magnesium oxide in bands and manganese‐containing dispersoids. Further, successive‐pitting filiform corrosion was observed along the underlying grain boundaries of the bulk alloy, which develops into crystallographic corrosion of the grain interiors.
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Liu et al. (2013) studied this question.
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