Corrosion behavior of Zn-Mg alloys in saturated Ca(OH)2 solution. (15th May 2018)

• Record Type: Journal Article
• Authors: Wang, Yan-qi; Kong, Gang; Che, Chun-shan; Weng, Tian-yu; Sun, Zi-wen
• Is Part Of: Corrosion science. Volume 136(2018)
• Page Start: 374
• Page End: 385
• Publication Date: 2018-05-15
• Subjects: Zinc -- Magnesium -- Alloy -- SEM -- Alkaline corrosion -- Passivity; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2018.03.032
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Corrosion behavior of the Zn-Mg alloys in saturated Ca(OH)2 solution was studied. The Zn-Mg alloys were passivated with more negative corrosion potential. Mg alloying caused inhomogeneity of the passivation layer. The Zn-Mg alloys were less resistant to corrosion compared to pure zinc. Abstract: 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 inhomogeneity 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.