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Smart stannate-based self-healing coatings for corrosion protection of magnesium alloys

Abstract:

Stannate chemical conversion coatings were used to improve the corrosion resistance of AZ91D. The pitting auto-repairing functionality of stannate coated samples and their performance were investigated in 3.5% NaCl using gas collection and electrochemical measurements. The polarization resistance (Rp) for the uncoated alloy was measured to be 3.1×103 Ω cm2. The Rp value increased by a factor of 4-5 for alloys coated with the stannate. The hydrogen evolution rate was also decreased for the stannate coated specimens, indicating that the stannate behaves as a barrier to prevent the chloride attack and hence, decreases the susceptibility to corrosion.