镁合金等离子喷涂Al/Al_2O_3涂层的耐腐蚀性能

材料热处理学报, 2009, 30(6): 164-168.

镁合金等离子喷涂Al/Al_2O_3涂层的耐腐蚀性能

宫文彪 ^1, , 李于朋 ^2, , 马凯 ^3, , 孙大千 ^4,

1.长春工业大学先进结构材料教育部重点实验室,吉林,长春,130012

2.长春工业大学先进结构材料教育部重点实验室,吉林,长春,130012

3.吉林大学材料科学与工程学院,吉林,长春,130022;长春工程学院机电学院,吉林,长春,130012

4.吉林大学材料科学与工程学院,吉林,长春,130022

基金项目: 吉林省科技发展项目(20070309)

关键词：镁合金 , Al/Al_2O_3 , 复合涂层 , 等离子喷涂 , 耐腐蚀性能

Corrosion resistance of Al/Al_2O_3 coating prepared by plasma spraying on magnesium alloy

GONG Wen-biao ^1, , LI Yu-peng ^2, , MA Kai ^3, , SUN Da-qian ^4,

1.长春工业大学先进结构材料教育部重点实验室,吉林,长春,130012

2.长春工业大学先进结构材料教育部重点实验室,吉林,长春,130012

3.吉林大学材料科学与工程学院,吉林,长春,130022;长春工程学院机电学院,吉林,长春,130012

4.吉林大学材料科学与工程学院,吉林,长春,130022

Keywords： magnesium alloy , Al/Al_2O_3 composite coatings , plasma spraying , corrosion resistance ,

采用等离子喷涂技术在AZ31镁合金表面制备Al/Al_2O_3复合涂层,测试了镁合金及表面喷涂有Al/Al_2O_3复合涂层的镁合金试样的极化曲线,研究了没有涂层、经封孔处理和未经封孔处理的喷涂有复合涂层的镁合金三种试样在浸泡腐蚀和5%NaCl盐雾腐蚀情况下的耐腐蚀性能及其腐蚀行为.结果表明,经封孔处理的Al/Al_2O_3复合涂层镁合金试样在上述腐蚀条件下的耐腐蚀性均优于镁合金和涂层未封孔处理的试样,在浸泡试验中未封孔处理的涂层试样比镁合金腐蚀更加严重,在盐雾试验中却优于镁合金.

Al/Al_2O_3 composite coating was prepared on AZ31 magnesium alloy by plasma spraying. The polarization curves of magnesium alloy and Al/Al_2O_3 composite coatings were examined by electrochemical test, respectively. The corrosion resistance and corrosion behavior of AZ31magnesium alloy and the alloy with and without Al/Al_2O_3 composite coatings were studied by immersing corrosion test and 5 % NaCl salt spray test.The results show that the corrosion resistance of the sample with Al/Al_2O_3 composite coating on magnesium alloy surface after sealing treatment is better than that of other samples. The corrosion degree of the unsealing treatment coating is more serious than that of magnesium alloy in immersing corrosion test, but it exhibits better corrosion resistance in salt spray test.

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