Corrosion of hot extrusion AZ91 magnesium alloy: I-relation between the microstructure and corrosion behavior |
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| Authors: | Tao Zhang Yawei Shao Guozhe Meng Zhongyu Cui Fuhui Wang |
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| Affiliation: | aCorrosion and Protection Laboratory, Key Laboratory of Superlight Materials and Surface Technology, Harbin Engineering University, Ministry of Education, Nantong ST 145, Harbin 150001, China;bState Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Wencui RD 62, Shenyang 110016, China |
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| Abstract: | The effect of hot extrusion on the corrosion behavior of AZ91 magnesiun alloy was investigated by weight loss, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurements. The results showed that the extruded alloy had lower corrosion resistance compared to cast alloy. This observation has been explained from point of view of microstructure changes, wherein the increased density of dislocation, twins and grain boundary increased the anodic dissolution of AZ91 alloy and rearrangement of β phase accelerated the rate of both the anodic and cathodic process. |
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| Keywords: | A Magnesium B SEM B TEM B EIS C Anodic dissolution |
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