纳米有机涂层在3.5%NaCl溶液中的电化学阻抗谱研究

Electrochemical Impedance Spectroscopy of Nano-Organic Coatings in NaCl Solution

纳米有机涂层防腐蚀性能良好,但目前有关其对金属防护的具体过程的研究却不多。将涂装纳米有机涂层的16MnR钢试样浸泡在3.5%的NaCl溶液中,采用电化学阻抗谱法(EIS)研究纳米有机涂层在试验周期360d不同测试时间的作用效果,分析各时段纳米有机涂层在NaCl溶液中对金属的防腐蚀情况。结果表明,纳米有机涂层体系对金属基体具有很好的保护性,其对金属的保护过程可以分为4个阶段:腐蚀介质渗入有机涂层阶段,腐蚀介质渗透到富锌涂层阶段,腐蚀产物形成阻挡层阶段,腐蚀产物填补孔隙阶段。

16MnR steel sample with nano-organic coating was immersed in 3.5% NaCl solution,and the electrochemical impedance spectroscopy （EIS） was used to studv the role of nano-organic coating on the 16MnR steel sample after experiment test for 360 d.Moreover,the anticorrosion effect of nano-organic coating on metal substrate over time was studied in NaCl solution.Results showed that the nano-organic coating had excellent protective effect on metal substrate,and the protective process for metal could be divided into four stages：corrosive medium penetrating into the phase of organic coating,corrosion medium infiltrating zinc-rich coating,corrosion products forming barrier layer and corrosion products filling the pores.