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Enhancing the Corrosion Resistance Performance of Mg-1.8Zn-1.74Gd-0.5Y-0.4Zr Biomaterial via Solution Treatment Process

by Ya Liu 1, Jiuba Wen 1,2,*, Huai Yao 1,2, Junguang He 1,2 and Huan Li 1
1
School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China
2
Collaborative Innovation Center of Nonferrous Metals of Henan Province, Luoyang 471023, China
*
Author to whom correspondence should be addressed.
Materials 2020, 13(4), 836; https://doi.org/10.3390/ma13040836 (registering DOI)
Received: 20 December 2019 / Revised: 30 January 2020 / Accepted: 10 February 2020 / Published: 12 February 2020
Microstructure and corrosion behavior of the solution-treated Mg-1.8Zn-1.74Gd-0.5Y-0.4Zr (wt%) alloy were studied. The results of microstructure indicated that the second phases of as-cast alloy was mainly comprised of Mg12Zn(Gd,Y) phase, Mg3Zn3(Gd,Y)2 phase and (Mg,Zn)3(Gd,Y) phase. After solution treatment process, the second phase gradually dissolved into the matrix, and the grain size increased. The effect of microgalvanic corrosion between α-Mg matrix and second phase was also improved. At the range of 470~510 °C solution treatment temperature, the corrosion resistance of the samples increases at first and then decreases slightly at 510 °C. All the solution-treated Mg-Zn-Gd-Y-Zr samples exhibit better corrosion resistance in comparison with as-cast sample. The existence form of the remaining phase affects the morphology of the corroded surface that relatively complete dissolution with homogeneous microstructure makes the sample more effective to obtain uniform corrosion form. The optimum temperature for solution treatment is 490 °C, which shows a much better corrosion resistance and uniform corrosion form after soaking for a long time. View Full-Text
Keywords: Mg-Zn-Zr-Gd-Y; solution treatment; microstructure; corrosion Mg-Zn-Zr-Gd-Y; solution treatment; microstructure; corrosion
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Liu, Y.; Wen, J.; Yao, H.; He, J.; Li, H. Enhancing the Corrosion Resistance Performance of Mg-1.8Zn-1.74Gd-0.5Y-0.4Zr Biomaterial via Solution Treatment Process. Materials 2020, 13, 836.

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