Nd、Y对AZ31镁合金热轧退火薄板耐蚀性的影响

doi:10.11896/cldb.19040031

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Abstract To improve the corrosion resistibility of hot-rolled and annealed AZ31 magnesium alloy thin sheet, rare earth elements Nd and Y were added to commercial AZ31 magnesium alloy composition.The corrosion resistance was studied by salt spray corrosion and electrochemical corrosion experiments, and the microstructure and structure of the alloy and corrosion products were observed and analyzed by SEM and XRD.The results indicate that with addition of rare earth elements (Nd, Y), corrosion resistant oxides Nd₂O₃ was formed on the surface of the AZ31 Mg alloy to protect the substrate; addition of Nd and Y elements resulted in positive offset of corrosion potential and decreas of corrosion density, which retardsed the speed of corrosion and therefore improved the alloy's corrosion resistance attributed to the new corrosion resistant precipitation Al₂Nd and Al₂Y; comparing with only adding Nd element, addition of Nd+Y elements can further improve AZ31 alloy's corrosion resistance, among the matrix of different weight percentages, 0.5%Nd+0.5%Y was proved to be the optimized formula.

Key words： AZ31 wrought magnesium alloy rare earth element salt spray corrosion electrochemical corrosion corrosion resistance

Published: 26 April 2020

CLC number:

TG146.22

Fund:This work was financially supported by the National Key Research and Development Program of China (2016YFB0700300).

Corresponding Authors: Shuiping Huobtained his Ph.D. degree in materials process engineering from the University of Science and Technology Beijing (USTB) and served in USTB until now. He is currently an associate professor in Institute of Engineering Technology USTB. His research interests focus on metal materials forming & heat treatment, and mechanical electro-hydraulic integration. He has published more than 50 journal papers, applied 20 national invention patents and 15 of them were authorized. In addition, he received several awards in the national metal industry.

About author:: Xiao Lireceived her Ph.D. degree in material science from University of Science and Technology Beijing (USTB) in 2010, and then joined in USTB as a post doctoral fellow from April 2010 to September 2012. She is currently a engineer in Laboratory of Institute of Engineering Technology of USTB. Her research interests focus on the morphology, structure and orientation (texture) of materials. She has published 16 journal papers and 1 patent was authorized.

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Cite this article:

LI Xiao,HU Shuiping,HAN Tianqi. Effects of Nd, Y on Corrosion Resistibility of Hot-rolled and Annealed AZ31 Magnesium Alloy Thin Sheets[J]. Materials Reports, 2020, 34(10): 10088-10092.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.19040031 OR http://www.mater-rep.com/EN/Y2020/V34/I10/10088

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