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Corrosion performance, corrosion fatigue behavior and mechanical integrity of an extruded Mg4Zn0.2Sn alloy
Journal of Materials Science & Technology ( IF 10.9 ) Pub Date : 2020-06-20 , DOI: 10.1016/j.jmst.2020.04.042
Pingli Jiang , Carsten Blawert , Jan Bohlen , Mikhail L. Zheludkevich

Magnesium alloys are promising as load bearing components. They are inevitably exposed to cyclic loading and corrosive environment in actual service, which can consequently result in corrosion fatigue failure and loss of mechanical integrity of the material. Therefore, in the present study, the corrosion behavior, corrosion fatigue performance and mechanical integrity of an extruded Mg4Zn0.2Sn (wt.%) alloy were thoroughly studied in two corrosive electrolytes. Strong localized corrosion occurred when the alloy was immersed in deionized water based sodium chloride (NaCl) solution. The poor corrosion resistance of the alloy resulted in a fast deterioration of the tensile properties after pre-exposure to salt spray and a poor fatigue resistance in deionized water based NaCl solution. In comparison, the active dissolution of the substrate was sufficiently suppressed in artificial tap water based NaCl solution due to the formation of highly protective corrosion product layers. This consequently conferred longer fatigue life on the alloy in the electrolyte. Our results emphasized the influence of corrosion on the fatigue behavior and tensile properties of magnesium alloys.



中文翻译:

Mg4Zn0.2Sn挤压合金的腐蚀性能,腐蚀疲劳行为和机械完整性

镁合金有望作为承重部件。它们在实际使用中不可避免地要承受周期性的载荷和腐蚀环境,因此可能导致腐蚀疲劳失效和材料机械完整性的损失。因此,在本研究中,对两种腐蚀电解液中挤压Mg4Zn0.2Sn(wt。%)合金的腐蚀行为,腐蚀疲劳性能和机械完整性进行了深入研究。将合金浸入去离子水基氯化钠(NaCl)溶液中时,会发生强烈的局部腐蚀。合金的较差的耐腐蚀性导致预暴露于盐雾后的拉伸性能快速下降,以及在去离子水基NaCl溶液中的较差的耐疲劳性。相比下,由于形成了高度保护性的腐蚀产物层,在人工自来水基NaCl溶液中充分抑制了基材的活性溶解。因此,这赋予了电解质中合金更长的疲劳寿命。我们的结果强调了腐蚀对镁合金的疲劳行为和拉伸性能的影响。

更新日期:2020-06-20
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