Abstract
The localized corrosion behaviors of SiCp/Al composites in 3.5% NaCl solution were in-situ investigated by the scanning micro-reference electrode technique. The results show that pitting is a predominant corrosion mechanism in these composites. Hydrolysis of Al4C3 at the interface of the composites is responsible for the first stage of the pitting attack. It was found that metastable pits were re-passivated by the corrosion products of Al(OH)2Cl and Al(OH)Cl2, and the propagation of metastable pits is related to the formation of AlCl3. In addition, a pitting mechanism for the composites is proposed.
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