运用光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)和X射线衍射仪(XRD)对近海含SO2环境中使用过的高压隔离开关2A12-T4铝合金部件的组织以及腐蚀特征进行分析.结果表明:2A12-T4铝合金晶粒沿变形方向拉长,并形成了一定数量的亚晶;主要的第二相是T相,并有大量的位错缠绕在T相周围.2A12-T4铝合金主要的腐蚀产物是Al(OH)3和Al2 (SO4)3.14H2O,腐蚀主要受到湿润条件下Cl-和SO2两种腐蚀性介质的联合作用,而拉长变形的晶粒以及第二相粒子则加速了腐蚀.
The microstructure and corrosion characteristics of 2A12-T4 aluminum alloy high voltage isolation switch parts used in offshore environment with SO2 were investigated by optical microscopy (OM),scanning electron microscopy (SEM),transmission electron microscopy (TEM) and X-ray diffraction (XRD).The results show that the grains of 2A12-T4 aluminum alloy were elongated along the deformation direction,and a certain number of subcrystals formed.The main second phase was T phase surrounded by a mass of dislocations.The main corrosion products of 2A12-T4 aluminum alloy were Al(OH)3 and Al2 (SO4)3 · 14H2O.The corrosive behavior was mainly controlled by Cl-and SO2 in moist environment.Additionally,the deformed elongated grains and the second phase particles accelerated the corrosion.
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