磷化液组分对铝合金磷化膜耐蚀性能的影响  

Effect of Phosphating Electrolyte Composition on the Corrosion Resistance of Phosphating Coating on Aluminium Alloy

作　　者：李思昊[1] 任广军[1] 

机构地区：[1]沈阳理工大学环境与化学工程学院,辽宁沈阳110159

出　　处：《电镀与精饰》2012年第12期11-13,共3页Plating & Finishing

摘　　要：采用电化学测试方法对LY12铝合金的锌系磷化膜的电化学性能进行研究。分别讨论了磷化液中磷酸二氢锌、硝酸锌、氯酸钠及氟化钠质量浓度的变化对磷化膜电化学性能的影响。结果表明,当溶液组成为10g/L磷酸二氢锌、35g/L硝酸锌、2g/L氯酸钠、3g/L氟化钠时,铝合金磷化膜的腐蚀电位最大,腐蚀电流最小,线性极化电阻最大,耐蚀性最好。The electrochemical behavior of zinc phosphating coating on LY12 aluminum alloy was studied by electrochemical tests. The influence of Zn（H2PO4） 2 · 2H2O, Zn（ NO3 ）2 · 6H2O, NaClO3 and NaF content on the electrochemical properties of zinc phosphating coating was determined. The results showed that under the combination of Zn（ H2PO4）2 · 2H2O 10g/L, Zn（ NO3 ）2 · 6H2O 35 g/L, NaClO3 2 g/L and NaF 3 g/L the phosphating coating has the maximum corrosion potential and linear polarization resistance, minimum eorrsoion current density and the best corrosion resistance.

关 键 词：铝合金 锌系磷化膜 线性极化电阻 耐蚀性 

分 类 号：TG174.451[金属学及工艺—金属表面处理]