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在Q345钢试样上喷涂无机富锌底漆、环氧云铁中间漆和丙烯酸聚氨酯面漆复合涂层,采用盐雾试验测试涂层的耐蚀性能,结合扫描电镜(SEM)观察腐蚀形貌,并计算腐蚀速率,采用电子探针分析技术(EPMA)对腐蚀介质的渗透原理进行了研究。结果表明:盐雾试验后,涂覆复合涂层试样的腐蚀速率仅为基材的6%左右,且表面形貌整体质量较好,仅预制划痕处腐蚀程度加重,腐蚀产物呈絮状,微观结构疏松,但腐蚀后涂层与基体宏观附着良好;Cl-可以穿透底漆到达金属基体,对金属产生腐蚀,而中间漆和面漆能够有效地阻止腐蚀溶液的渗透。
On the Q345 steel samples were sprayed inorganic zinc-rich primer, epoxy iron-iron intermediate paint and acrylic polyurethane topcoat composite coating, the corrosion resistance of the coating was tested by salt spray test, and the corrosion morphology was observed by scanning electron microscope (SEM) , And calculate the corrosion rate, the use of electronic probe analysis technology (EPMA) on the corrosive media penetration principle was studied. The results show that after the salt spray test, the corrosion rate of the coated composite coating sample is only about 6% of the substrate, and the overall quality of the surface morphology is good. Only the pre-scratched corrosion degree is aggravated, and the corrosion products are flocculent , The microstructure is loose, but the macroscopic adhesion between the coating and the substrate after corrosion is good. Cl- can penetrate the primer to reach the metal matrix and cause corrosion to the metal, while the middle paint and the top paint can effectively prevent the infiltration of the corrosion solution.