2014/03/26 by Xian Zhang, Inger Odnevall Wallinder, Christofer Leygraf · 9 citations
Materials Science · Engineering · #Corrosion Behavior and Inhibition #Materials Engineering and Processing #Magnesium Oxide Properties and Applications
paper · doi:10.1016/j.corsci.2014.03.028
The mechanism of corrosion product flaking on bare copper sheet and three copper-based alloys in chloride rich environments has been explored through field and laboratory exposures. The tendency for flaking is much more pronounced on Cu and Cu–4 wt%Sn than on Cu–15 wt%Zn and Cu–5 wt%Al–5 wt%Zn. This difference is explained by the initial formation of zinc and zinc–aluminum hydroxycarbonates on Cu15Zn and Cu5Al5Zn, which delays the formation of CuCl, a precursor of Cu2(OH)3Cl. As a result, the observed volume expansion during transformation of CuCl to Cu2(OH)3Cl, and concomitant corrosion product flaking, is less severe on Cu15Zn and Cu5Al5Zn than on Cu and Cu4Sn.