Evaluation of self-healing ability of Ce-V conversion coating on AZ31 magnesium alloy  

作　　者：Xiao Jiang Ruiguang Guo Shuqin Jiang 

机构地区：[1]Key Lab of Northwest Water Resources,Environment and Ecology,Ministry of Education,Xi’an University of Architecture and Technology,Xi’an 710055,China

出　　处：《Journal of Magnesium and Alloys》2016年第3期230-241,共12页镁合金学报（英文）

基　　金：The National Natural Science Foundation of China(Grant No.20976143);the Specialized Research Fund for the Doctoral Program of the Ministry of Education(Grant No.20096120110007,China).

摘　　要：This study investigated the influence of cerium nitrate in vanadate solutions on the properties of Ce–V conversion coatings on AZ31 magnesium alloys,and evaluated the self-healing behavior of the Ce–V conversion coating for AZ31 magnesium alloy.The results showed that the additions of cerium nitrate prevented pentavalent vanadium from reducing to tetravalent vanadium in the coatings during conversion reaction process.Adding appropriate cerium nitrate to vanadate solution led to a thicker coating with a more compact CeVO_(4) layer.The corrosion behavior of the Ce–V conversion coating was investigated by the electrochemical tests and the scratch immersion test in 3.5 wt.%NaCl solution.The self-healing ability of the coating was confirmed from all tests.The surface analysis revealed that the self-healing effect of the Ce–V conversion coating was only provided by the release and migration of vanadium compounds.

关 键 词：AZ31 magnesium alloy VANADIUM CERIUM SELF-HEALING Electrochemical impedance spectroscopy 

分 类 号：TG1[金属学及工艺—金属学]