Study on Adhesion and Anticorrosive Performance of Magnesium Phosphate Coating Modified by Vac/E and PVE
ZHENG Chuanjie1, LI Yanli1, DONG Huizhu1, TANG Shihao2, FAN Xuhan2, PEI Yan2,*
1 Shandong Electric Power Engineering Consulting Institute Corp., Ltd., Jinan 250199, China 2 School of Civil Engineering, Shandong University, Jinan 250061, China
Abstract: Magnesium phosphate cement (MPC) is a candidate material for inorganic anti-corrosion with excellent performance. However, when it is used for anti-corrosion of the steel surfaces, there are still some problems, such as the coordinated deformation of coating and steel, the evaluation and improvement of anti-corrosion ability. In this work, the modified MPC coating was prepared by Vac/E and PVE. The changes in the setting time and adhesion of the coating with different contents of Vac/E and PVE were studied. The electrochemical performance of the coa-ting with the selected content was analyzed. Combined with the phase composition and micromorphology analysis, the adhesion mechanism between Vac/E and PVE modified MPC coating was revealed. The results show that compared with epoxy coating, the adhesion of Vac/E and PVE-modified MPC coating is improved by 2—3 levels, which meets the engineering application requirements of anti-corrosion coating for power infrastructure. The modified effect of PVE is better than that of Vac/E, and its optimal content is 1%. During the accelerated corrosion process, the coating resistance decreases by only 24.62%, and the penetration decreases by 1—2 orders of magnitude, exhibiting good anti-corrosion performance. SEM analysis shows that the space network structure formed by PVE polymerization is interspersed in the hydration product of MPC, which improves the compactness of the coating and delays the destruction of the passive film. Vac/E could be adsorbed on the surface of the hydration product, inhibits its hydrolysis, and be not conducive to the re-passivation of the pitting corrosion area.
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2025, Vol. 39 
