Abstract:This paper presents the galvanic corrosion behaviors of AM60 magnesium alloy coupled with variable materials(carbon steel,stainless steel,brass and aluminum alloy) in the outdoor atmosphere of Beijing.The correlations among mass variation,galvanic effect and atmospheric factors for AM60 magnesium alloy coupons were investigated.Surface morphologies were observed by scanning electron microscopy(SEM),and X-ray diffraction(XRD) was used to analyze the crystal corrosion products.The results showed that the AM60 magnesium alloy acted as anodic material when it coupled with tested metals.The arrangement order of galvanic effect from strong to little is carbon steel,brass,stainless steel and aluminum alloy after 12 months exposure in Beijing atmosphere.The atmospheric galvanic effect of magnesium alloys coupled with aluminum alloy is the least among the tested coupled alloys during any testing periods because the effective potential difference of the cathode(AM60) and anode(aluminum alloy) is the least for all of tested coupled alloys.The atmospheric galvanic effects in Beijing compared with other cities indicate that atmospheric environment is most important factor.The atmospheric galvanic effects for magnesium alloys are affected by cathode alloy,testing time,sample acreage and environment condition.And no intact and protective corroded products layer was formed to prevent further corrosion after 1 year exposure.The edge of AM60 coupon suffered harsh galvanic corrosion,which was limited by the existing of thin-film on the coupon surface.The high dust precipitation of Beijing could prolong the time of wetness on metal surface.So,the atmospheric corrosion of AM60 magnesium alloy coupled with different metals could be accelerated.