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Corrosion behavior of a dynamically deformed Al–Mg alloy
Electrochimica Acta ( IF 6.6 ) Pub Date : 2020-07-04 , DOI: 10.1016/j.electacta.2020.136695
V.K. Beura , C. Kale , S. Srinivasan , C.L. Williams , K.N. Solanki

The interplay between residual strain and corrosive medium can accelerate the material failure either by stress corrosion cracking or corrosion fatigue. Thus, in this work, the effect of deformation history on the electrochemical behavior of Al–Mg (AA5083) alloy in a 0.6 M NaCl solution was investigated. Initially, the Al5083 samples were deformed using forward Taylor anvil experiments and digital image correlation measurement was performed to characterize the accumulated plastic strain in the samples as well as the effect of higher defect density and fragmentation of coarse cathodic intermetallic particles. Potentiodynamic and cyclic polarization experiments were performed and results showed an increase in corrosion current density and a negative shift in protection potential in impacted samples. This is further confirmed using post corrosion microstructure, which showed a higher probability of trenching around fragmented cathodic particles near the impacted end. Hence, prior deformation history found to alter the electrochemical property to a large extent.



中文翻译:

动态变形的Al-Mg合金的腐蚀行为

残余应变和腐蚀性介质之间的相互作用可以通过应力腐蚀开裂或腐蚀疲劳来加速材料破坏。因此,在这项工作中,研究了变形历史对0.6M NaCl溶液中Al-Mg(AA5083)合金的电化学行为的影响。最初,使用正向泰勒砧实验对Al5083样品进行变形,并进行数字图像相关测量以表征样品中累积的塑性应变以及较高的缺陷密度和粗大的阴极金属间化合物碎片的影响。进行了电位动力学和循环极化实验,结果表明腐蚀样品中腐蚀电流密度增加,保护电位发生负迁移。使用腐蚀后的微观结构可以进一步证实这一点,腐蚀后的微观结构显示出在撞击端附近破碎的阴极颗粒周围开槽的可能性更高。因此,发现先前的变形历史在很大程度上改变了电化学性能。

更新日期:2020-07-13
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