Jia Chunyan*,Liu Haitao.Effect of sealing treatment on corrosion resistance of zinc phosphating film prepared under ultrasonic condition[J].Plating & Finishing,2024,(9):48-55.[doi:doi: 10.3969/j.issn.1001-3849.2024.09.007]
封闭处理对超声波辅助制备的锌系磷化膜耐蚀性的影响
- Title:
- Effect of sealing treatment on corrosion resistance of zinc phosphating film prepared under ultrasonic condition
- Keywords:
- zinc phosphating film; ultrasonic; sealing treatment; corrosion resistance; cerium nitrate solution; sodium silicate solution
- 分类号:
- TQ153
- 文献标志码:
- A
- 摘要:
- 在Q345钢磷化过程中引入超声波以改善锌系磷化膜表面平整度和致密性，为进一步提高超声波辅助制备的锌系磷化膜耐蚀性，分别采用油性封闭剂、硝酸铈溶液、硅酸钠溶液进行封闭处理。结果表明：硅酸钠溶液的封闭效果好于油性封闭剂和硝酸铈溶液，封闭后超声锌系磷化膜的物相组成为Zn3(PO4)2·4H2O、Zn2Fe(PO4)2·4H2O、ZnSiO3和Na2SiO3，并且呈现良好的致密性和耐蚀性，其耐硫酸铜点滴时间超过150 s，腐蚀电流密度低至3.20×10-6 A/cm2，较未封闭超声锌系磷化膜的腐蚀电流密度降低幅度接近一个数量级。在硅酸钠溶液封闭过程中发生腐蚀整平现象，同时生成ZnSiO3并析出Na2SiO3起到填补孔隙的作用，使超声锌系磷化膜的致密性得到更大程度改善，从而显著增强抗腐蚀能力。
- Abstract:
- Ultrasonic was introduced in the phosphating process of Q345 steel to improve the surface flatness and compactness of zinc phosphating film. In order to further improve the corrosion resistance of zinc phosphating film prepared under ultrasonic condition, oil sealing agent, cerium nitrate solution and sodium silicate solution were used for sealing treatment respectively. The results show that the sealing effect of sodium silicate solution is better than that of oil sealing agent and cerium nitrate solution. After sealing treatment in sodium silicate solution, the zinc phosphating film prepared under ultrasonic condition is composed of Zn3(PO4)2·4H2O, Zn2Fe(PO4)2·4H2O, ZnSiO3 and Na 2SiO3 phases and shows good compactness and corrosion resistance. The time against corrosion of copper sulfate dropping exceeds 150 s, and the corrosion current density is as low as 3.20×10 -6 A/cm 2, which is nearly an order of magnitude lower than that of the unsealed zinc phosphating film prepared under ultrasonic condition. Corrosion leveling phenomenon occurs during the sealing process of zinc phosphating film in sodium silicate solution, and ZnSiO3 is formed and Na 2SiO3 is precipitated which can play the role of filling the pores. Therefore, the compactness of the zinc phosphating film prepared under ultrasonic condition is improved to a greater extent, thus significantly enhancing the corrosion resistance
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