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题名: High corrosion resistance and weak corrosion anisotropy of an as-rolled Mg-3Al-1Zn (in wt.%) alloy with strong crystallographic texture
作者: Wang, B. J.;  Xu, D. K.;  Xin, Y. C.;  Sheng, L. Y.;  Han, E. H.
发表日期: 2017-11-22
摘要: Combining with electrochemical corrosion measurements, immersion and hydrogen evolution testing performed in 0.9 wt.% NaCl solution at 37 degrees C, the corrosion resistance of an as-rolled Mg-3%Al-1%Zn alloy before and after a 3% compressive strain along the rolling direction was investigated. Results revealed that the corrosion behavior of differently oriented surfaces of the as-rolled samples with a strong basal texture was obviously different. Among them, the corrosion rate of sample surface with the orientation parallel to the normal direction (ND) of the plate was the fastest, the corrosion rate of sample surface with the orientation parallel to the rolling direction (RD) of the plate took the second place and the corrosion rate of sample surface with the orientation parallel to the transverse direction (TD) was the slowest. After being pre-strained, the activation of a high density of {10-12} twins could remarkably reduce the corrosion rate of surrounding alpha-Mg matrix and simultaneously weaken the corrosion anisotropy between differently oriented samples. The main reason was that similar to grain boundaries, twin boundaries acted as physical barriers to the corrosion attack. Moreover, the activated twins increased the protectiveness of surface films and then suppressed the micro corrosion couples occurred in twinned grains.
Appears in Collections:中国科学院金属研究所_期刊论文

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Recommended Citation:
Wang, B. J.,Xu, D. K.,Xin, Y. C.,et al. High Corrosion Resistance And Weak Corrosion Anisotropy Of An As-rolled Mg-3al-1zn (in Wt.%) Alloy With Strong Crystallographic Texture[J]. Nature Publishing Group,2017,7:-.

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