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New insights on corrosion behavior of aging precipitates in dilute Mg-Al-Ca alloy by experiments and first-principles calculations

出版日期: 2023-05-05

DOI: https://doi.org/10.1016/j.corsci.2023.111254

作者: Kai Zhang; Cheng Wang; Shi Liu; Kai Guan; Mei-Xuan Li; Lin-Yang Zhang; Hui-Yuan Wang;

The effects of aging precipitates (i.e. G.P. zone, Al2Ca) on corrosion behavior of Mg-1.0Al-0.3Ca alloy have been systematically investigated combining experiments and first-principles calculations. Being different from Al2Ca causing the micro-galvanic corrosion of Mg matrix, monolayer G.P. zones significantly decrease the corrosion rate (PW) from 11.34 to 6.62 mm/y, and attain excellent corrosion resistance-strength synergy. The G.P. zones composed of Al and Ca atoms corrode preferentially over Mg matrix, resulting in accumulation of more Al-containing corrosion products on alloy surface. Establishment of corrosion product film rich in Al-containing oxides weakens the cathode activity of Mg alloy during corrosion.

全文链接: https://www.sciencedirect.com/science/article/pii/S0010938X23002962/pdfft?md5=7734631f5dd0b6ffddbfed3ad63001ee&pid=1-s2.0-S0010938X23002962-main.pdf

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