6种铝阳极氧化无铬封孔膜的性能比较

材料保护, 2009, 42(2): 31-34.

6种铝阳极氧化无铬封孔膜的性能比较

周琦 ^1, , 贺春林 ^2, , 才庆魁 ^3, , 邵忠宝 ^4, , 朱学松 ^5,

1.东北大学材料与冶金学院,辽宁,沈阳,110004;沈阳理工大学环境与化学工程学院,辽宁,沈阳,110168

2.沈阳大学表面工程研究所,辽宁,沈阳,110044

3.沈阳大学表面工程研究所,辽宁,沈阳,110044

4.东北大学材料与冶金学院,辽宁,沈阳,110004

5.沈阳理工大学环境与化学工程学院,辽宁,沈阳,110168

基金项目: 辽宁省科技攻关计划项目(2004221010) 辽宁省自然科学基金(20052003)

关键词：阳极氧化 , 铝 , 封孔膜 , 勃姆石溶胶

Comparison of the Propertier of Six Kinds of Cr-Free Sealed Films for Anodized Aluminum

为了消除铝阳极氧化膜高耐蚀封孔液中六价铬对环境的污染,对LY12铝合金阳极氧化膜分别进行勃姆石溶胶封孔、硝酸铈溶液封孔、Ni2+-Co2+盐高温水解封孔、Co2+-三乙醇胺常温封孔和Ni2+-F--Zn2+盐常温封孔,测试无铬封孔膜的膜重,磷铬酸酸浸失重,酸性点滴液变色时间,并进行染色试验,然后与沸水封孔、重铬酸钠封孔工艺做对比.结果表明,无铬封孔方法中勃姆石溶胶法制得的封孔膜的点滴液变色时间最长为36 min,酸浸失重量最小为2.45 g/m2,且封孔膜染色后膜颜色最浅;极化曲线和电化学阻抗谱显示封孔膜的耐3.5%NaCl腐蚀性由强到弱依次为:勃姆石溶胶封孔膜>重铬酸钠封孔膜>Ni2+-F--Zn2+封孔膜>沸水封孔膜>Ni2+-Co2+封孔膜>硝酸铈封孔膜>Co2+-三乙醇胺封孔膜,且盐水中溶胶封孔膜的腐蚀电流密度比重铬酸钠封孔膜的低2个数量级.

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