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微弧氧化Mg-3Al-1Zn镁合金应力腐蚀和腐蚀疲劳行为研究
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太原工业学院机械工程系

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Stress corrosion cracking and corrosion fatigue behaviors of micro-arc oxidized Mg-3Al-1Zn alloy
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1.Department of Mechanical Engineering,Taiyuan Institute of Technology,No ,Xinlan Road;2.Shanxi Key Laboratory of Advanced Magnesium-Based Materials,School of Materials Science and Engineering,Taiyuan University of Technology

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    摘要:

    本文主要对微弧氧化Mg-3Al-1Zn镁合金在空气和3.5 wt.%硫酸钠溶液两种环境下的应力腐蚀和腐蚀疲劳行为进行研究,并讨论其相互关系。微弧氧化处理后,Mg-3Al-1Zn镁合金的耐蚀性能得到明显改善。与Mg-3Al-1Zn镁合金基体相比,在空气中,微弧氧化后合金的应力腐蚀和腐蚀疲劳强度均下降了大约10 MPa。在3.5 wt.%硫酸钠溶液环境中,微弧氧化后合金的腐蚀疲劳性能仍然是恶化的,但是应力腐蚀强度却得到了显著改善,从58.24 MPa提高至202.08 MPa。这表明材料的力学性能(应力腐蚀和腐蚀疲劳)并不是与其腐蚀性能完全保持线性关系的。微弧氧化处理后镁合金在空气中的应力腐蚀断口为韧性断裂,在硫酸钠溶液环境中为解理断裂。而其腐蚀疲劳断口不论是在空气中还是在腐蚀环境中均为解理断裂。这主要是由于腐蚀环境和变换循环载荷的影响,两者共同作用将会加速裂纹扩展。这表明,周围环境和加载类型对材料断裂机理有重要影响。

    Abstract:

    The stress corrosion cracking (SCC) and corrosion fatigue (CF) behaviors of micro-arc oxidized (MAO) Mg-3Al-1Zn alloy were conducted in air and 3.5 wt.% Na2SO4 solution, and their relations were discussed. The corrosion properties of the MAO Mg-3Al-1Zn alloy were improved significantly. Compared with those of the Mg-3Al-1Zn substrate, the SCC and CF strengthes of the MAO Mg-3Al-1Zn alloy were both reduced only about 10 MPa slightly in air. In 3.5 wt.% Na2SO4 solution, the CF properties were still degraded, but the SCC properties of the MAO specimens were enhanced apparently, from 58.24 MPa to 202.08 MPa. It indicated that the mechanical properties (SCC and CF) were not always linearly related with the corrosion resistance of the material. It was ductile fracture for the SCC specimens in air, and it was cleavage fracture in 3.5 wt.% Na2SO4 solution. While they were cleavage fractures for CF specimens regardless of the environments. This was due to the effect of the corrosive environment and alternating cyclic loading, which accelerated the crack propagation process. It displayed that the surrounding environments and loading types could affect the fracture mechanism of the material.

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贺秀丽,闫志峰,梁红玉,白瑞,佘银柱.微弧氧化Mg-3Al-1Zn镁合金应力腐蚀和腐蚀疲劳行为研究[J].稀有金属材料与工程,2020,49(9):2997~3004.[He Xiuli, Yan Zhifeng, Liang Hongyu, Bai Rui, She Yinzhu. Stress corrosion cracking and corrosion fatigue behaviors of micro-arc oxidized Mg-3Al-1Zn alloy[J]. Rare Metal Materials and Engineering,2020,49(9):2997~3004.]
DOI:10.12442/j. issn.1002-185X. E20190094

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  • 收稿日期:2019-07-27
  • 最后修改日期:2019-09-09
  • 录用日期:2019-09-11
  • 在线发布日期: 2020-10-15
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