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NaCl induced corrosion of Zn-0.2Al,Zn-5Al and Zn-55Al coated steel was investigated at low and ambient CO 2 levels.Weight loss measurements revealed an enhancement of the corrosion of Zn-0.2Al and particularly Zn-5Al in low CO 2 .This was connected to an increase of surface pH in a low CO 2 atmosphere promoting the formation of ZnO and layered double hydroxide for Zn-5Al.For Zn-55Al, CO 2 depletion did not affect the surface pH due to the acidification effect of Al 3+ .Preferential dissolution of zinc rich phase was observed on cross-sections, particularly in depleted CO 2 experiments.Different sequences of corrosion product formation were proposed for the different Zn-Al coatings.
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LeBozec et al. (2018) studied this question.
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