Effect of extrusion on corrosion behavior and corrosion mechanism of Mg-Y alloy
The influences of the hot extrusion process on the microstructure, corrosion behavior and corrosion mechanism for Mg-Y magnesium alloy were studied by means of the microstructure observation, weight loss test, electrochemical test and corrosion morphology test. The results showed that with increasin...
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| Published in | Journal of rare earths Vol. 34; no. 3; pp. 315 - 327 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier B.V
01.03.2016
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| Subjects | |
| Online Access | Get full text |
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| Summary: | The influences of the hot extrusion process on the microstructure, corrosion behavior and corrosion mechanism for Mg-Y magnesium alloy were studied by means of the microstructure observation, weight loss test, electrochemical test and corrosion morphology test. The results showed that with increasing of the extrusion ratio, the shear flow line on the vertical section of the extruded alloy increased, the shear bands parallel lines became more clearly visible, and a large number of fine equiaxed grains distributed in parallel with the flow lines. The open circuit potential had a certain degree of improvement after extrusion, the open circuit potential increased with increment of extrusion ratio, and the corrosion potential of the vertical section was higher than that of the same alloy in the same compression ratio. The shift rate of the corrosion potential relatively became larger with increasing of the extrusion ratio, and the cathode corrosion current corresponding to the branch migration shifted to the positive direction. The high frequency capacitive arc increased with increment of the extrusion ratio, and the radius of capacitive arc of the vertical section was slightly larger than that of the transverse section. The corrosion morphologies of Mg-0.25 Y alloy were uniform corrosion, and the corrosion morphologies of Mg-（2.5, 5, 8 and 15） were the pitting corrosion and the small range, deep depth localized corrosion. |
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| Bibliography: | 11-2788/TF extrusion; Mg-Y alloy; corrosion behavior; corrosion mechanism; rare earths XU Hong , ZHANG Xin , ZHANG Kui, SHI Yang , REN Jiping （1. School of Materials Science and Engineering, North University of China, Taiyuan 030051, China; 2. Institute of Thermal Power Generation Technology, China Datung Coporation Science and Technology Research Institute, Beijing 102206, China; 3. State Key Lab for Fabrication ＆ Processing of Non-ferrous Metals, General Research Institute for Non-ferrous Metals, Beijing 100088, China; 4. Shenyang Area Military Representative Office of Armored Military Repre- sentative Office, Chinese PLA General Armament Department, Shenyang 110016, China） The influences of the hot extrusion process on the microstructure, corrosion behavior and corrosion mechanism for Mg-Y magnesium alloy were studied by means of the microstructure observation, weight loss test, electrochemical test and corrosion morphology test. The results showed that with increasing of the extrusion ratio, the shear flow line on the vertical section of the extruded alloy increased, the shear bands parallel lines became more clearly visible, and a large number of fine equiaxed grains distributed in parallel with the flow lines. The open circuit potential had a certain degree of improvement after extrusion, the open circuit potential increased with increment of extrusion ratio, and the corrosion potential of the vertical section was higher than that of the same alloy in the same compression ratio. The shift rate of the corrosion potential relatively became larger with increasing of the extrusion ratio, and the cathode corrosion current corresponding to the branch migration shifted to the positive direction. The high frequency capacitive arc increased with increment of the extrusion ratio, and the radius of capacitive arc of the vertical section was slightly larger than that of the transverse section. The corrosion morphologies of Mg-0.25 Y alloy were uniform corrosion, and the corrosion morphologies of Mg-（2.5, 5, 8 and 15） were the pitting corrosion and the small range, deep depth localized corrosion. |
| ISSN: | 1002-0721 2509-4963 |
| DOI: | 10.1016/S1002-0721(16)60031-5 |