AZ31镁合金铈转化膜在NaCl溶液中的腐蚀性研究  

Research on Corrosion Resistance of Cerium Conversion Coatings on AZ31 Magnesium Alloy in Na Cl Solution

作　　者：王雷 林经武 李晓[1] 李佳佳 胡志[1] WANG Lei, LIN Jingwu, Li Xiao, LI Jiajia, HU Zhi(Institute of Advanced Forming, Nanchang University, Nanchang 330031, Chin)

机构地区：[1]南昌大学先进成形研究所

出　　处：《热加工工艺》2018年第4期150-154,163,共6页Hot Working Technology

基　　金：国家自然科学基金资助项目(51405216);江西省青年科学家培养对象计划(20153BCB23023);江西省青年自然科学基金项目(20151BAB216018)

摘　　要：对AZ31镁合金表面进行稀土铈转化成膜处理,采用扫描电镜、失重法、电化学测试研究了AZ31镁合金铈转化膜在0.05mol/LNa Cl溶液中的腐蚀行为。结果表明：经过成膜处理72 h后,试样的腐蚀速率稳定在0.122 mg·cm^（-2）·h^（-1）,而未经成膜处理的镁合金腐蚀速率为0.4583 mg·cm^（-2）·h^（-1）。腐蚀电位先增加后减小,而腐蚀电流密度先减小后增大。腐蚀4h后,腐蚀电位为-1.432 V,腐蚀电流密度为1.393×10^（-1）μA·cm^（-2）。The corrosion behavior of cerium conversion coating on AZ31 magnesium alloy in 0.05 mol/L NaC1 solutionwere investigated by scanning electron microscope, mass loss method and electrochemical test methods. The results show thatthe corrosion rate of magnesium alloy after film-forming for 72 h is around 0.122 mg. cm-2. h-1, while the corrosion rate ofmagnesium alloy without film-forming treatment is 0.4583 mg .cm2 -h-1. The corrosion potential increases first, and thendecreases, while the corrosion current density decreases firstly, and then increases. After corrosion for 4 h, the corrosionpotential is -1.432 V, while the corrosion current density is 1.393×10^（-1）μA·cm^（-2）.

关 键 词：镁合金 耐腐蚀性 铈转化膜 

分 类 号：TG146[一般工业技术—材料科学与工程]