用电化学阻抗谱（EIS）、电化学噪声（EN）及扫描电子显微镜（SEM）研究磷酸锌对磷酸锌/环氧涂层的保护作用及其保护尺寸的变化规律。研究表明，磷酸锌使划痕处的腐蚀产物变得致密，并对划痕有保护作用，随着划痕尺寸的增大其保护作用逐渐减弱。利用电化学噪声的散粒噪声理论并结合Gumbel随机分析方法研究磷酸锌的作用机制，发现磷酸锌填料的加入降低磷酸锌/环氧涂层的腐蚀生长概率，最终降低金属的腐蚀速度。
The protection dimension of scratched zinc phosphate/epoxy coating was studied by means of electrochemical impedance spectroscopy (EIS), electrochemical noise measurements (EN) and scanning electron microscopy (SEM). The experimental results of EN, EIS and SEM revealed that zinc phosphate could inhibit the corrosion of the scratched epoxy coatings; the protection effect was gradually weakened with increasing scratch dimension from 0.4 mm, 1.0 mm to 2.0 mm. The mechanism of the inhibition of zinc phosphate pigment was analyzed based upon the shot noise theory combined with Gumbel distribution function. It showed that the corrosion growth probability of the metal under the coating decreased with the addition of zinc phosphate.
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