经氟碳漆喷涂表面处理的铝合金建筑型材在建筑楼房安装放置一段时间后，在铝型材推拉门附近出现大量的腐蚀白斑和鼓泡现象。采用宏观检验、化学成分分析、金相组织检验、电镜微观分析以及涂层性能检测等方法对腐蚀的铝型材产品进行分析，探讨了铝型材的腐蚀机理。结果表明：铝型材腐蚀白斑主要成分除氧化铝外，含有大量氯的腐蚀物，由于铝型材表面存在大量氯元素，氯离子不断腐蚀渗透，形成腐蚀孔洞，从而造成铝型材表面腐蚀，引起铝型材的腐蚀失效。
A lot of corrosive white-spots and bubbling appeared on the surface of wrought aluminum alloy treated by PVDF coating of sliding doors of aluminium profile after the buildings were installed for a period of time.The methods of macro examination,chemical component analysis,metallographic inspection,electron microscopy analysis and coating property test and so on were applied to inspect the corrosive aluminum alloys.The corrosion mechanism of wrought aluminum alloy extruded profile was discussed.The results showed that the main components of white spots on the wrought aluminum alloy were corrosion products of chloride besides aluminum oxide.Due to plenty of chloride existing on the surface of wrought aluminum alloy,chloride ions cautiously corroded the wrought aluminum alloy and formed corrosion perforation.It caused corrosion failure of the wrought aluminum alloy extruded profile.
参考文献
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