三种除锈方式对Q235钢表面涂层耐蚀性能的影响

目的对比研究3种不同除锈方式(打磨除锈、先除锈后磷化、除锈-磷化一体化)处理Q235钢表面后,对涂层的耐腐蚀性能的影响。方法在3种除锈方式处理后的Q235钢表面喷涂石墨烯环氧富锌底漆,测试涂层的附着力,通过中性盐雾试验测试涂层的耐腐蚀性能。结果Q235钢经过除锈-磷化一体化处理后,表面性能变优,涂层附着力达到13.6MPa,1000h中性盐雾试验后,涂层不起泡、不脱落,腐蚀程度小。结论除锈-磷化处理Q235钢表面可有效提高防腐涂层的耐蚀性能,与先除锈后磷化相比,简化了工艺过程。

Influence of Three Derusting Methods on the Corrosion Resistance of Q235 Steel Surface Coating

The effects of three different derusting methods (grinding and derusting, first derusting and then phosphating, and derusting and phosphating integration) on the corrosion resistance of the coating are compared and studied. The surface of Q235 steel treated with three rust removal methods is sprayed with graphene epoxy zinc-rich primer to test the adhesion of the coating, and the corrosion resistance of the coating is tested through the neutral salt spray test. The test results show that the surface performance of Q235 steel becomes better after the integrated treatment of rust removal and phosphating, and the coating adhesion reaches 13.6 MPa. After the neutral salt spray test for 1000 h, the coating does not blisters, does not fall off, and the degree of corrosion is small. Rust removal and phosphating treatment on the surface of Q235 steel can effectively improve the corrosion resistance of the anti-corrosion coating, which simplifies the process compared with first rust removal and then phosphating.