沿海工业环境下6A02铝合金接线板的腐蚀行为

摘要

采用扫描电镜观察、X射线衍射分析、电化学分析等方法,结合实际服役地区大气环境分析,研究了变电站电流互感器用6 A02铝合金接线板在沿海工业环境中的腐蚀行为及机理.结果表明:铝合金接线板主要发生晶间腐蚀,且由晶间腐蚀向均匀腐蚀发展;腐蚀产物主要为铝的硫化物和氯化物;大气中的Cl-和硫化物降低了铝合金接线板的腐蚀电位,提高了腐蚀电流密度,是导致铝合金接线板腐蚀失效的主要因素.%The corrosion behavior and mechanism of 6A02 aluminum alloy wiring board for substation current transformer in coastal industrial environment were studied by the methods such as scanning electron microscope observation, X-ray diffraction and electrochemical analysis, combining with the analysis of actual service atmospheric environment.The results show that the intergranular corrosion of the aluminum alloy wiring board mainly occurred,and then evolved gradually into the uniform corrosion.The corrosion products were mainly composed of aluminum sulfides and chlorides.Cl- and sulfides in atmosphere reduced the corrosion potential and increased the corrosion current density of the aluminum alloy wiring board,which were the main factors causing the corrosion failure of the aluminum alloy wiring board.