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微弧氧化Mg-3Al-1Zn鎂合金應(yīng)力腐蝕和腐蝕疲勞行為研究
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太原工業(yè)學(xué)院機(jī)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:

    本文主要對(duì)微弧氧化Mg-3Al-1Zn鎂合金在空氣和3.5 wt.%硫酸鈉溶液兩種環(huán)境下的應(yīng)力腐蝕和腐蝕疲勞行為進(jìn)行研究，并討論其相互關(guān)系。微弧氧化處理后，Mg-3Al-1Zn鎂合金的耐蝕性能得到明顯改善。與Mg-3Al-1Zn鎂合金基體相比，在空氣中，微弧氧化后合金的應(yīng)力腐蝕和腐蝕疲勞強(qiáng)度均下降了大約10 MPa。在3.5 wt.%硫酸鈉溶液環(huán)境中，微弧氧化后合金的腐蝕疲勞性能仍然是惡化的，但是應(yīng)力腐蝕強(qiáng)度卻得到了顯著改善，從58.24 MPa提高至202.08 MPa。這表明材料的力學(xué)性能（應(yīng)力腐蝕和腐蝕疲勞）并不是與其腐蝕性能完全保持線性關(guān)系的。微弧氧化處理后鎂合金在空氣中的應(yīng)力腐蝕斷口為韌性斷裂，在硫酸鈉溶液環(huán)境中為解理斷裂。而其腐蝕疲勞斷口不論是在空氣中還是在腐蝕環(huán)境中均為解理斷裂。這主要是由于腐蝕環(huán)境和變換循環(huán)載荷的影響，兩者共同作用將會(huì)加速裂紋擴(kuò)展。這表明，周圍環(huán)境和加載類型對(duì)材料斷裂機(jī)理有重要影響。

    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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賀秀麗,閆志峰,梁紅玉,白瑞,佘銀柱.微弧氧化Mg-3Al-1Zn鎂合金應(yīng)力腐蝕和腐蝕疲勞行為研究[J].稀有金屬材料與工程,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
  • 錄用日期:2019-09-11
  • 在線發(fā)布日期: 2020-10-15
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