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| PROTECTION DIMENSION OF SCRATCHED ZINC PHOSPHATE/EPOXY COATING |
| SHI Qiumei, SHAO Yawei, ZHANG Tao, MENG Guozhe, CHEN Qihao |
| Materials Science & Chemistry Engineering College, Harbin Engineering University, Harbin 150001 |
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Abstract 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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Received: 24 March 2010
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Corresponding Authors:
SHI Qiumei
E-mail: shaoyawei@hrbeu.edu.cn
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