辅助促进剂对建筑结构钢锌锰系磷化膜耐蚀性的影响  

Effect of Auxiliary Accelerators on Corrosion Resistance of Zinc-Manganese Phosphating Film on Construction Structural Steel

作　　者：王飞[1] 张龙[2] WANG Fei;ZHANG Long(Wuhan Technical College of Communications,Wuhan 430000,China;Wuhan Polytechnic Uni‐versity,Wuhan 430023,China)

机构地区：[1]武汉交通职业学院,湖北武汉430000 [2]武汉轻工大学,湖北武汉430023

出　　处：《电镀与精饰》2022年第8期13-18,共6页Plating & Finishing

基　　金：湖北武汉教育委员会科学技术研究项目(201905628)。

摘　　要：分别向磷化液中添加柠檬酸钠、钼酸钠、硝酸镨作为辅助促进剂,选取常用的建筑结构钢Q345作基体制备锌锰系磷化膜,研究不同类型辅助促进剂对磷化膜的微观形貌、成分、厚度和耐蚀性的影响。结果表明:添加不同类型辅助促进剂制备的磷化膜表面平整度和致密性相比于基础磷化膜明显改善,耐蚀性有不同程度的提高。柠檬酸钠、钼酸钠和硝酸镨对磷化膜的成分和厚度影响不太显著,但辅助促进剂的添加能加快成膜速率。硝酸镨吸附在Q345钢表面能提供更多的活性成核点,促进更快成膜且结晶细致,制备的磷化膜缺陷少、致密性较好,其电荷转移电阻、阻抗模值和耐点蚀时间分别达到2964Ω·cm^(2)、7931.6Ω·cm^(2)、172 s,无论形貌还是耐蚀性都好于添加柠檬酸钠和钼酸钠制备的磷化膜。与柠檬酸钠和钼酸钠相比,硝酸镨是较佳的辅助促进剂,能更有效地提高建筑结构钢表面锌锰系磷化膜的耐蚀性。Sodium citrate,sodium molybdate and praseodymium nitrate were added into the phosphat‐ing solution as auxiliary accelerators respectively,and zinc-manganese phosphating film was prepared on Q345 steel which was commonly used for construction structural steel.The effect of different types of auxiliary accelerators on the microstructure,components,thickness and corrosion resistance of phos‐phating film was studied.The results showed that the surface flatness and compactness of the phosphat‐ing film prepared by adding different types of auxiliary accelerators were obviously improved compared to that of the basic phosphating film,and the corrosion resistance was improved in different degrees.So‐dium citrate,sodium molybdate and praseodymium nitrate have no significant effect on the components and and thickness of phosphating film,but the addition of auxiliary accelerator can accelerate the film forming rate.Praseodymium nitrate adsorb on the surface of 16 Mn steel can provide more active nucle‐ation and promote faster film formation and fine crystallization,the phosphating film has fewer defects and better compactness,its charge transfer resistance,impedance modulus and pitting resistance time reached to 2964Ω·cm^(2),7931.6Ω·cm^(2)and 172 s,respectively.The morphology and corrosion resis‐tance of the phosphating film prepared by adding praseodymium nitrate were better than those of the phosphating film prepared by adding sodium citrate and sodium molybdate.Compared with sodium ci‐trate and sodium molybdate,praseodymium nitrate was a better auxiliary accelerator,which can more effectively improve the corrosion resistance of zinc-manganese phosphating film on surface of construc‐tion structural steel.

关 键 词：锌锰系磷化膜 耐蚀性 辅助促进剂 柠檬酸钠 钼酸钠 硝酸镨 

分 类 号：TB43[一般工业技术]