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| ROLES OF ZINC PHOSPHATE ON THE CORROSION OF THE SCRATCHED EPOXY COATING |
| CAO Jia; SHAO Yawei; ZHANG Tao; MENG Guozhe |
| Materials Science & Chemistry Engineering School; Harbin Engineering University;Harbin 150001 |
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Abstract The roles of zinc phosphate on the corrosion of the scratched coating were studied by electrochemical impedance spectroscopy(EIS), electrochemical noise measurements(EN) and scanning electrochemical microscopy(SECM). The experimental results of EN and EIS revealed that zinc phosphate had inhibition effect on the corrosion of the scratched epoxy coatings. The SECM results implied that the scratched surface of zinc phosphate coating was healed by an insulated film indeed. The mechanism of zinc phosphate on the corrosion of the scratched coating was analyzed based on the combined stochastic theory and shot noise theory using the Weibull distribution and Gumbel distribution function. It showed that the corrosion generation rate and the corrosion growth probability of the metal under the coatings were decreased with the addition of zinc phosphate.
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Received: 05 November 2008
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Corresponding Authors:
SHAO Yawei
E-mail: shaoyawei@hrbeu.edu.cn.
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