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with the passivation tendency or conductivity difference between the Si phase and the substrate of α(Al) phase. Fig. 3 SEM images showing A356 aluminium alloy substrate and coatings formed in 2 g/L NaAlO2 + 1......
alloys. They can react with oxygen to form discontinuous passivation film, reducing the stress corrosion and resulting in denser surface film. MANIVANNAN et al [64] indicated that the addition of 1.0......