11 - Smart stannate-based self-healing coatings for corrosion protection of magnesium alloys
By Makhlouf, A.S.H.
Published in Handbook of Smart Coatings for Materials Protection
Woodhead Publishing
2014
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.