镁合金大气电偶腐蚀初期规律  

Initial laws of atmospheric galvanic corrosion for magnesium alloys

作　　者：童震松[1] 张巍[1] 李久青[1] 程菲[1] 

机构地区：[1]北京科技大学材料科学与工程学院腐蚀与防护中心,北京100083

出　　处：《中国有色金属学报》2004年第4期554-561,共8页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50122118)

摘　　要：研究了AZ91D、AM50、AM60铸造镁合金与A3钢、316L不锈钢、H62黄铜、LY12铝合金组成的电偶对分别在青岛和武汉现场暴晒3个月和6个月后的大气电偶腐蚀行为及规律。结果显示,镁合金始终是电偶对的阳极;当其与其它4种材料偶接时,其腐蚀速率增加。镁合金与A3钢偶合后,其大气电偶腐蚀效应最大,而与LY12铝合金组成的电偶对的大气电偶腐蚀效应最小。不同镁合金的大气电偶腐蚀效应存在如下关系:γAZ91D>γAM50>γAM60。暴晒3个月后,青岛的大气电偶腐蚀效应明显高于武汉的大气电偶腐蚀效应。随着暴晒时间的延长,青岛和武汉的大气电偶腐蚀效应分别呈降低和升高的趋势。The galvanic corrosion behaviour and laws of AZ91D, AM50 and AM60 cast magnesium alloys coupled with A3 steel, 316L stainless steel, H62 brass, LY12 aluminum alloy undergone atmospheric exposure in Qingdao and Wuhan for three and six months were investigated, respectively. The results show that the magnesium alloys act as anode and their corrosion rates increase when they are coupled with mentioned four metals. The atmospheric galvanic effect of magnesium alloys coupled with A3 steel is the largest, while that of the magnesium alloys/LY12 aluminum alloy couple is the smallest. And there is a relationship between the atmospheric galvanic effects of different magnesium alloys: γ_(AZ91D)>γ_(AM50)>γ_(AM60). The results also show that, for the same galvanic couple which is exposed for three months, the atmospheric galvanic effect in Qingdao is obviously higher than that in Wuhan. But the atmospheric galvanic effect reduces in Qingdao and increases in Wuhan with increasing exposure time.

关 键 词：镁合金 大气腐蚀 腐蚀速率 电偶腐蚀 

分 类 号：TG172.3[金属学及工艺—金属表面处理]