Ni^(2+)对铝合金磷化膜结构和耐蚀性的影响  

Effect of Ni^(2+) on Structure and Corrosion Resistance of Phosphate Conversion Coating on Aluminum Alloy

作　　者：胡文娇[1] 周勇[1] 李依旋 张丹[1] 熊金平[1] 

机构地区：[1]北京化工大学教育部碳纤维及功能高分子重点实验室,北京100029 [2]北京碧海舟腐蚀防护工业股份有限公司,北京100029

出　　处：《电镀与精饰》2012年第1期1-4,共4页Plating & Finishing

摘　　要：通过表面分析和电化学测试等研究了Ni2+对LY12铝合金表面锌系磷化膜结构和耐蚀性的作用。结果表明,LY12铝合金表面锌系磷化膜的主要成分是Zn3(PO4)2.4H2O,而Ni2+的细化晶粒作用使锌系磷化膜的结构变得更加完整致密,其加入不影响锌系磷化膜的化学组成和相组成;与不含Ni2+的磷化液处理相比,经含有Ni2+的磷化液处理后的铝合金在3.5%的NaCl溶液中的腐蚀电流密度明显下降,在100 mHz频率下的阻抗值明显增大,表现出良好的防护性。Effect of Ni^2 ＋ on structure and corrosion resistance of zinc system phosphate conversion coating on aluminum alloy LY12 was studied by surface analysis approaches and electro-chemical technologies. Results showed that main component of the coating was Zn3 （PO4 ）2 · 4H2O, structure of the coating became more complete and compact due to grain refinement function of the Ni^2＋ and both chemical and phase composition of the coating were not affected by the Ni^2＋ , for the aluminum alloy phosphated in Ni^2＋ containing bath, corrosion current density decreased clearly and impedance increased clearly at 100 mHz frequency in 3.5% NaCl solution compared with that in Ni^2＋ -free phosphating bath.

关 键 词：LY12铝合金 磷化膜 镍离子 耐蚀性 

分 类 号：TG174.45[金属学及工艺—金属表面处理]