Laser cladding of Al+Ir powders on ZM5 magnesium base alloy

来源期刊：Rare Metals2007年第5期

论文作者：CHEN Changjun,),WANG Maocai),WANG Dongsheng),JIN Ren),and LIU Yiming) ) State Key Laboratory for Corrosion and Protection,Institute of Metal Research,Chinese Academy of Sciences,Shenyang ,China ) Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,College of Materials & Metallurgy,Wuhan University of Science & Technology,Wuhan ,China ) Shenyang Liming Aero-engine Corporation,Shenyang ,China

文章页码：420 - 425

摘    要：Laser cladding of preplaced Al + Ir powders on a ZM5 magnesium alloy was performed to enhance the corrosion resistance of the ZM5 magnesium alloy. A metallurgical bond was obtained at the coating/substrate interface. The corrosion potential （Ecorr） of the laser cladded sample was 169 mV positive to that of the untreated ZM5 substrate,while the corrosion current （Icorr） was some one order of magnitude lower. The laser cladded sample,unlike the untreated ZM5 substrate,showed a passive region in the polarization plot. Immersion tests confirmed that the corrosion resistance of the laser cladded ZM5 sample was significantly enhanced in 3.5 wt.% NaCl solution. The Al-rich phases of AlIr,Mg17Al12,and Al formed in the cladding layer and the rapid solid characteristics were contributed to the improved corrosion behavior of the coating.