Journal
CORROSION SCIENCE
Volume 136, Issue -, Pages 374-385Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2018.03.032
Keywords
Zinc; Magnesium; Alloy; SEM; Alkaline corrosion; Passivity
Funding
- project of International Lead and Zinc Research
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The influence of Mg addition on the corrosion behavior of Zn-x%Mg (x = 0.5, 1.5 and 3) alloys in saturated Ca (OH)(2) solution was investigated with pure zinc as a reference. The Zn-Mg alloys were passivated but less resistant to corrosion. Mg alloying caused more negative corrosion potential of the Zn-Mg alloys and in homogeneity of the passivation layer. Alternately preferential dissolution of the primary Zn-rich dendrites (PZD) and Zn-Mg eutectics (ZME) regions was observed. This was probably linked to the galvanic coupling between the PZD and ZME regions, and/or the Mg-rich passivation layer less resistant to corrosion than the Ca-rich passivation layer.
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