隔离开关用Al-Mg-Cu合金引流板的腐蚀原因
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摘要
研究了腐蚀后Al-Mg-Cu合金引流板的显微组织、微区成分、电化学腐蚀性能以及腐蚀产物成分等,并与新引流板的进行了对比,分析了其腐蚀失效的原因。结果表明:Al-Mg-Cu合金引流板的腐蚀是由含硫的酸雨引起的,电流热效应导致引流板的组织老化,θ相的析出和粗化使引流板的耐腐蚀性能进一步降低。
The microstructure,micro area composition,electrochemical corrosion property and corrosion product composition of the corroded Al-Mg-Cu alloy drainage plate were investigated and compared with those of the new drainage plate.The reason for corrosion failure was analyzed.The results show that the corrosion of the Al-MgCu alloy drainage plate was caused by acid rain containing sulphur element;the thermal effect of electric current led to the aged structure of the drainage plate,and the precipitation and coarsening ofθphase decreased the corrosion resistance of the drainage plate further.
The microstructure,micro area composition,electrochemical corrosion property and corrosion product composition of the corroded Al-Mg-Cu alloy drainage plate were investigated and compared with those of the new drainage plate.The reason for corrosion failure was analyzed.The results show that the corrosion of the Al-MgCu alloy drainage plate was caused by acid rain containing sulphur element;the thermal effect of electric current led to the aged structure of the drainage plate,and the precipitation and coarsening ofθphase decreased the corrosion resistance of the drainage plate further.
引文
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