(北京科技大學(xué) 材料科學(xué)與工程學(xué)院腐蝕與防護(hù)中心，
北京 100083)
摘 要: 研究了AZ91D、 AM50、 AM60鑄造鎂合金與A3鋼、 316L不銹鋼、 H62黃銅、 LY12鋁合金組成的電偶對分別在青島和武漢現(xiàn)場暴曬3個月和6個月后的大氣電偶腐蝕行為及規(guī)律。 結(jié)果顯示， 鎂合金始終是電偶對的陽極；當(dāng)其與其它4種材料偶接時， 其腐蝕速率增加。鎂合金與A3鋼偶合后， 其大氣電偶腐蝕效應(yīng)最大，而與LY12鋁合金組成的電偶對的大氣電偶腐蝕效應(yīng)最小。不同鎂合金的大氣電偶腐蝕效應(yīng)存在如下關(guān)系： γAZ91D>γAM50>γAM60。暴曬3個月后， 青島的大氣電偶腐蝕效應(yīng)明顯高于武漢的大氣電偶腐蝕效應(yīng)。隨著暴曬時間的延長， 青島和武漢的大氣電偶腐蝕效應(yīng)分別呈降低和升高的趨勢。
關(guān)鍵字: 鎂合金; 電偶腐蝕; 大氣
（ Corrosion and Protection Center, School of Materials Science and Engineering,
University of Science and Technology Beijing,
Beijing 100083, China）
Abstract: 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: γAZ91D>γAM50>γAM60. 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.
Key words: magnesium alloy; galvanic corrosion; atmosphere
