Abstract
ABSTRACTAccelerated NVDA (VDA 233-102) tests were performed on bare Zn and Al sheets, Galfan coating (Zn–5 wt-% Al) and Galvalume coating (Zn–55 wt-% Al) on steel. ZnO, Zn(OH)2 and Zn5(OH)8Cl2·H2O were the main corrosion products identified on both bare Zn sheet and Galfan. AlOOH and Al(OH)3 were preferentially formed on bare Al sheet and Galvalume. In addition, Zn–Al–containing corrosion products, Zn6Al2(OH)16CO3·4H2O and/or Zn2Al(OH)6Cl·2H2O were identified on both Galfan and Galvalume. Corrosion products of Zn6Al2(OH)16CO3·4H2O with a platelet morphology were preferentially formed in the zinc-rich interdendritic regions of the Galvalume surface. Galfan revealed a similar corrosion behaviour as bare Zn sheet, whereas Galvalume exhibited similar behaviour as bare Al sheet. Deposition of chlorides highly influenced the corrosion of both Galvalume and Al rather than Galfan and Zn due to the rapid local damage of the compact native thin film of Al2O3.
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