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在北京大气环境下,研究AM60镁合金和不同金属材料(碳钢、不锈钢、黄铜和铝合金)偶接的电偶腐蚀行为规律。研究表明,镁合金作为阳极发生不同程度的电偶腐蚀,通过1a的北京大气环境下的暴露试验后,AM60镁合金的电偶腐蚀效应由强到弱的顺序为:碳钢、黄铜、不锈钢和铝合金,其中镁合金与LY12铝合金偶接的电偶腐蚀效应最小。通过与其它地区室外暴晒的镁合金电偶腐蚀效应的对比,表明环境因素影响着镁合金的电偶腐蚀效应。同时阴极材料、试验时间、试样尺寸(偶接面积)和试验环境都会对镁合金电偶腐蚀效应产生影响。经1a曝晒的AM60镁合金形成了具有保护性的腐蚀产物层阻碍了腐蚀发展。北京地区高自然降尘量导致金属表面湿润时间加大,从而加速了AM60镁合金的电偶腐蚀。采用XRD方法分析表面的腐蚀产物,用金相显微镜和扫描电镜(SEM)观察试样腐蚀后的表面形貌特征和腐蚀产物的结构,并用与之相连的能谱仪分析腐蚀产物中的元素组成。
In the atmospheric environment of Beijing, the galvanic corrosion behavior of AM60 magnesium alloy and different metal materials (carbon steel, stainless steel, brass and aluminum alloy) were studied. The results show that the galvanic corrosion of magnesium alloy acts as anodic electrode to some extent. After the exposure test of 1a in Beijing atmospheric environment, the galvanic corrosion effect of AM60 magnesium alloy from strong to weak is carbon steel, brass, stainless steel And aluminum alloy, magnesium alloy and LY12 aluminum alloy galvanic coupling effect of the smallest. Compared with the galvanic corrosion effect of magnesium alloy exposed outdoors in other areas, it shows that environmental factors affect the galvanic corrosion effect of magnesium alloy. At the same time, the cathode material, test time, sample size (coupling area) and test environment all affect the galvanic corrosion effect of magnesium alloy. The 1a-exposed AM60 magnesium alloy formed a protective corrosion product layer that hindered the development of corrosion. The high dustfall in Beijing led to the increase of metal surface wetting time, which accelerated the galvanic corrosion of AM60 magnesium alloy. The corrosion products of the surface were analyzed by XRD. The surface topography and the structure of the corrosion products were observed by metallographic microscope and scanning electron microscope (SEM), and the elemental composition of the corrosion products was analyzed by the spectrometer connected with them .