Corrosion mechanism and corrosion model of Mg-Y alloy in NaCl solution

Hong Xu; Zhiquan Wu; Xiaoru Wang; Xin Zhang; Jiping Ren; Yang Shi; Zepu Wang; Liwei Wang; Changhua Liu

doi:10.1007/s11595-016-1489-2

Journal of Wuhan University of Technology Materials Science Edition ›› 2016, Vol. 31 ›› Issue (5) : 1048 -1062. DOI: 10.1007/s11595-016-1489-2

Metallic Materials

Corrosion mechanism and corrosion model of Mg-Y alloy in NaCl solution

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Abstract

Corrosion of Mg–Y alloy was studied using electrochemical evaluations, immersion tests and SEM observations. Corrosion mechanisms of Mg-(0.25 and 2.5) Y alloy and Mg-(5, 8, and 15) Y alloy were uniform corrosion and pitting corrosion respectively, and the content of Mg₂₄Y₅ phases determined its effect acting as cathode to accelerate the corrosion or corrosion barrier to inhibit the corrosion. Corrosion resistance of Mg-(0.25, 2.5, 5, 8, and 15) Y alloys was as follows: R_t(Mg-0.25Y) < R_t(Mg-8Y) < R_t(Mg-15Y) < R_t(Mg-5Y) < R_t(Mg-2.5Y). Y could significantly improve the corrosion resistance of the Mg-Y alloy, but the excess of Y deteriorated the corrosion resistance of the Mg-Y alloy. The optimum content of Y in the studied alloys was 2.5%.

Keywords

Mg-Y / corrosion / electrochemical / weight loss rate

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Hong Xu, Zhiquan Wu, Xiaoru Wang, Xin Zhang, Jiping Ren, Yang Shi, Zepu Wang, Liwei Wang, Changhua Liu. Corrosion mechanism and corrosion model of Mg-Y alloy in NaCl solution. Journal of Wuhan University of Technology Materials Science Edition, 2016, 31(5): 1048-1062 DOI:10.1007/s11595-016-1489-2

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