用电化学阻抗谱研究提高锆基无铬化学转化膜耐蚀性的方法  

Study on methods for improving corrosion resistance of chromium-free zirconium-based chemical conversion film by electrochemical impedance spectroscopy

作　　者：徐子谦[1] 李明芳 马鸿婷 辛钢[2] XU Zi-qian;LI Ming-fang;MA Hong-ting;XIN Gang(Chemical Engineering College, Xiamen University, Xiamen 361000, China)

机构地区：[1]1厦门大学化学化工学院,福建厦门361000 [2]大连理工大学化学学院,辽宁大连116024

出　　处：《电镀与涂饰》2018年第4期173-177,共5页Electroplating & Finishing

摘　　要：采用含1.4%(质量分数)ZRT-955陶化环保处理剂的水溶液(pH=4.5),在20°C下对Q235钢板表面锆化处理12 min,通过测量所得锆化膜在0.35%(NH_4)_2SO_4+0.05%NaCl的模拟汗液中的电化学阻抗谱(EIS),探索了烘干温度和缓蚀处理对膜层耐蚀性的影响。确定最佳烘干温度为180°C。采用硅氧烷酮类缓蚀剂对锆基转化膜进行后处理能够有效地提高其防腐性能。Q235steel sheets were treated by zirconium-based chemical conversion in an environment-friendly solution containing1.4wt.%of ZRT-955zirconization agent at a temperature of20°C and pH4.5for12min.The effects of baking temperature and corrosion inhibition treatment on corrosion resistance of the zirconium-based conversion film were studied by electrochemical impedance spectroscopy in an artificial sweat solution composed of0.35%(NH4)2SO4and0.05%NaCl.The optimal baking temperature was determined to be180°C.The post-treatment with siloxane ketone inhibitor greatly improves the corrosion resistance of zirconium-based conversion film.

关 键 词：低碳钢 锆基转化膜 电化学阻抗谱 模拟汗液 耐蚀性 缓蚀剂 

分 类 号：TG178[金属学及工艺—金属表面处理] TQ153.6[金属学及工艺—金属学]