| Mg_2Si及Si粒子在Al-Mg-Si合金晶间腐蚀中协同作用机理的多电极偶合研究 |
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| 引用本文： | 李朝兴,李劲风,BIRBILIS Nick,贾志强,郑子樵. Mg_2Si及Si粒子在Al-Mg-Si合金晶间腐蚀中协同作用机理的多电极偶合研究[J]. 中国腐蚀与防护学报, 2010, 0(2) |
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| 作者姓名： | 李朝兴 李劲风 BIRBILIS Nick 贾志强 郑子樵 |
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| 作者单位： | 中南大学材料科学与工程学院;中南大学有色金属材料科学与工程教育部重点实验室;ARC Centre of Excellence for Design in Light Metals;Department of Materials Engineering;Monash University;3800 Australia; |
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| 摘 要： | 通过测定Al-Mg-Si合金晶界各组成相的极化曲线及不同Mg/Si比Al-Mg-Si合金晶界组成相(AlMg_2Si及Al-Mg_2Si-Si)间的动态电化学偶合行为,研究了不同Mg/Si比Al-Mg-Si合金的晶间腐蚀机理。研究表明,晶界Si电位比其边缘Al基体正,在整个腐蚀过程中作为阴极导致其边缘Al基体的阳极溶解。晶界Mg_2Si电位比其边缘Al基体负,在腐蚀初期将作为阳极而发生阳极溶解;由于Mg_2Si中活性较高元素Mg的优先溶解,不活泼元素Si富集,致使Mg_2Si电位正移,甚至与其边缘Al基体发生极性转换,导致其边缘Al基体的阳极溶解。Mg/Si1.73的Al-Mg-Si合金晶界只存在不连续分布的含Mg、Si的析出相,不能在晶界形成连续腐蚀通道,合金不表现出晶间腐蚀敏感性。Mg/Si1.73的Al-Mg-Si合金晶界同时析出含Mg、Si析出相和Si粒子;腐蚀首先萌生于Mg_2Si相;而后,Si粒子一方面导致其边缘无沉淀带严重的阳极溶解,另一方面通过加速Mg_2Si和晶界无沉淀带的极性转换,协同促进了Mg_2Si边缘无沉淀带的阳极溶解,即腐蚀沿晶界Si粒子及Mg_2Si粒子边缘的无沉淀带发展。Si粒子促进了腐蚀的发展,导致合金表现出严重的晶间腐蚀敏感性。
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| 关 键 词： | Al-Mg-Si合金 晶间腐蚀 腐蚀机理 |
SYNERGETIC EFFECT OF Mg_2Si AND Si PARTICLES ON INTERGRANULAR CORROSION OF Al-Mg-Si ALLOYS THROUGH MULTI-ELECTRODE COUPLING SYSTEM |
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| LI Chaoxing,LI Jinfeng,BIRBILIS Nick,JIA Zhiqiang,ZHENG Ziqiao. SYNERGETIC EFFECT OF Mg_2Si AND Si PARTICLES ON INTERGRANULAR CORROSION OF Al-Mg-Si ALLOYS THROUGH MULTI-ELECTRODE COUPLING SYSTEM[J]. Journal of Chinese Society For Corrosion and Protection, 2010, 0(2) |
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| Authors: | LI Chaoxing LI Jinfeng BIRBILIS Nick JIA Zhiqiang ZHENG Ziqiao |
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| Affiliation: | LI Chaoxing~1,LI Jinfeng~(1,2),BIRBILIS Nick~3,JIA Zhiqiang~1,ZHENG Ziqiao~(1,2) (1.School of Materials Science , Engineering,Central South University,Changsha 410083,2.Key Laboratory of Nonferrous Metal,Materials Science , Engineering,Ministry of Education,3.ARC Centre of Excellence for Design in Light Metals,Department of Materials Engineering,Monash University,3800.Australia) |
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| Abstract: | The potentiodynamic scanning curves and the electrochemical coupling behaviors of constituent phases at the grain boundary of Al-Mg-Si alloy were investigated.The corrosion mechanism of Al-Mg-Si alloys different ratio of Mg to Si was analyzed.The results show that the Si particle is cathodic to the Al-base and causes the anodic dissolution of Al-base at its adjacent periphery.At the beginning,the precipitate of Mg_2Si is anodic to the Al-base and corrosion occurs on its surface.However,during its corrosion ... |
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| Keywords: | Al-Mg-Si alloys intergranular corrosion corrosion mechanism |
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