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用电化学阻抗谱(EIS)、电化学噪声(EN)及扫描电化学显微镜(SECM)等方法对带有划痕的环氧清漆涂层和环氧/磷酸锌涂层进行了测试,研究了磷酸锌对涂层破损处金属的缓蚀作用。EIS和EN的结果表明:加入磷酸锌后涂层下金属基体的腐蚀受到抑制;SECM结果直观地证明了磷酸锌对涂层划痕有修复作用。用电化学噪声的散粒噪声理论并结合随机分析方法研究了磷酸锌的作用机制,结果发现加入磷酸锌不但大大减缓了腐蚀的孕育速度,还降低了腐蚀的生长概率,因而能够减缓金属基体腐蚀的进行。
Scratched epoxy varnish coatings and epoxy / zinc phosphate coatings were tested by electrochemical impedance spectroscopy (EIS), electrochemical noise (EN) and scanning electrochemical microscopy (SECM) Corrosion Inhibition Effect of Zinc Phosphate on the Damaged Coatings. The results of EIS and EN show that the corrosion of the metal matrix under the zinc phosphate coating is inhibited. The SECM results show that the zinc phosphate can repair the coating scratches. Electrochemical noise of the shot noise theory combined with random analysis of zinc phosphate mechanism of action and found that the addition of zinc phosphate not only greatly slowed down the rate of corrosion of the growth, but also reduces the probability of corrosion growth, which can slow down the corrosion of the metal matrix To carry out.