铝合金稀土转化膜工艺及性能研究
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摘要
以Ce(NO_3)_3为主要成膜剂,采用正交试验法和单因素试验法研究了6061铝合金的稀土转化成膜工艺,并对转化膜的表面形貌、成分和耐蚀性进行了分析。试验结果表明:转化膜为棕黄色;转化膜中含有铈、锰元素;稀土转化处理的铝合金硫酸铜点滴试验达到340 s以上,电化学测试自腐蚀电流密度icorr相比铝合金基体降低了2个数量级,极化电阻约是未处理的93倍,有效提高了铝合金的耐蚀性能。
Using Ce(NO_3)_3 as the main film forming agent,the rare earth conversion process of 6061 aluminum alloy was studied by orthogonal test and single factor test,and the surface morphology,composition and corrosion resistance of the membrane were analyzed.this paper addressed the process of rare earth conversion of 6061 aluminum alloy,using Ce(NO_3)_3 as the main film-forming agent,the film formation process and film properties were studied by orthogonal test and single factor test.The test results show that,the conversion film is brownish yellow; the transformation membrane contains Cerium and manganese elements,Moreover,the copper sulfate spot test of the rare earth conversion film reaches 340 s;the self-corrosion current density is reduced by two orders of magnitude;the polarization resistance is about 93 times that of the untreated,which effectively improves the corrosion resistance of the aluminum alloy.
Using Ce(NO_3)_3 as the main film forming agent,the rare earth conversion process of 6061 aluminum alloy was studied by orthogonal test and single factor test,and the surface morphology,composition and corrosion resistance of the membrane were analyzed.this paper addressed the process of rare earth conversion of 6061 aluminum alloy,using Ce(NO_3)_3 as the main film-forming agent,the film formation process and film properties were studied by orthogonal test and single factor test.The test results show that,the conversion film is brownish yellow; the transformation membrane contains Cerium and manganese elements,Moreover,the copper sulfate spot test of the rare earth conversion film reaches 340 s;the self-corrosion current density is reduced by two orders of magnitude;the polarization resistance is about 93 times that of the untreated,which effectively improves the corrosion resistance of the aluminum alloy.
引文
[1] 顾宝珊,宫丽,杨培燕.铝合金表面稀土转化膜性能与耐蚀机理研究[J].稀有金属材料与工程,2014,43(02):429-434.
[2] 李波涛,何昌协,徐志飞.6061铝合金表面稀土铈盐法处理工艺研究[J].有色金属加工,2018,47(03):39-42.
[3] 于兴文,曹楚南,林海潮.LY12铝合金表面稀土转化膜腐蚀行为的研究[J].中国稀土学报,2000(03):243-248.
[4] 陈东初,吴桂香,潘晖,等.铝合金环境友好型非铬化学转化表面处理技术的研究[J].兵器材料科学与工程,2007(05):32-36.
[5] 李文芳,张凯,杜军.铝合金Ce-Mn转化膜溶液中HF_2～-离子作用机理研究[J].中国腐蚀与防护学报,2012,32(01):39-43.
[6] Lin Bilan,Lu Jintang,Kong Gang.Effect of molybdate post-sealing on the corrosion resistance of zinc phosphate coatings on hot-dip galvanizedsteel[J].Corrosion,2008,50(4):962-967.
[2] 李波涛,何昌协,徐志飞.6061铝合金表面稀土铈盐法处理工艺研究[J].有色金属加工,2018,47(03):39-42.
[3] 于兴文,曹楚南,林海潮.LY12铝合金表面稀土转化膜腐蚀行为的研究[J].中国稀土学报,2000(03):243-248.
[4] 陈东初,吴桂香,潘晖,等.铝合金环境友好型非铬化学转化表面处理技术的研究[J].兵器材料科学与工程,2007(05):32-36.
[5] 李文芳,张凯,杜军.铝合金Ce-Mn转化膜溶液中HF_2～-离子作用机理研究[J].中国腐蚀与防护学报,2012,32(01):39-43.
[6] Lin Bilan,Lu Jintang,Kong Gang.Effect of molybdate post-sealing on the corrosion resistance of zinc phosphate coatings on hot-dip galvanizedsteel[J].Corrosion,2008,50(4):962-967.