1050铝合金单宁酸-钼酸铵-氟锆酸体系化学转化  

Chemical conversion of 1050 aluminum alloy in tannic acid-ammonium molybdate-fluorozirconic acid bath

作　　者：张巧云[1] 陈泽民[1] 李冉 ZHANG Qiao-yun;CHEN Ze-min;LI Ran(Faculty of Chemistry and Material Science,Langfang Teachers College,Langfang 065000,China)

机构地区：[1]廊坊师范学院化学与材料科学学院,河北廊坊065000

出　　处：《电镀与涂饰》2018年第7期317-320,共4页Electroplating & Finishing

基　　金：河北省教育厅重点项目(ZD2016104);廊坊师范学院青年基金(LSZQ201301)

摘　　要：通过测量开路电位-时间曲线,研究了单宁酸、钼酸铵、氟硼酸铵和氟锆酸的含量以及p H对1050铝合金化学转化的影响。得到最佳工艺条件为:单宁酸0.6 g/L,钼酸铵3.0 g/L,氟硼酸铵4.0 g/L,氟锆酸4 m L/L,p H 4,室温,时间15 min。成膜过程分为表面活化、成膜反应和膜层沉积3个阶段。在最佳工艺条件下所得膜层的厚度为2.5μm,附着力为0级,抗冲击能力为50 kg?cm,耐中性盐雾试验时间为180 h。The effects of the contents of tannic acid,ammonium molybdate,ammonium fluoroborate,and fluorozirconic acid,as well as pH on chemical conversion for 1050 aluminum alloy were studied by measuring the open circuit potential vs.time curves.The optimized process conditions are:tannic acid 0.6 g/L,ammonium molybdate 3.0 g/L,ammonium fluoroborate 4.0 g/L,fluorozirconic acid 4 mL/L,pH 4,room temperature,and treatment time 15 min.There are three stages for the film forming process,i.e.surface activation,film forming reaction,and film deposition.The conversion film obtained under the optimal conditions features a thickness of 2.5μm,an adhesion strength of 0 grade,a shock resistance up to 50 kg?cm,and a neutral salt spray corrosion resistance up to 180 h.

关 键 词：铝合金 无铬化学转化 单宁酸 钼酸铵 氟锆酸 开路电位 耐蚀性 

分 类 号：TQ153.6[化学工程—电化学工业]