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[目的]研究热镀锌环保彩涂板的腐蚀失效机制，为提升其耐蚀性提供理论依据。[方法]通过划痕+中性盐雾试验模拟涂层损伤，结合电化学阻抗谱(EIS)、极化曲线测试及扫描电子显微镜(SEM)形貌表征，研究腐蚀介质与产物在不同涂层间的传输与漆膜起泡失效机制。[结果]面漆层结构致密且含铝粉填料，形成“迷宫效应”，能够显著延缓腐蚀介质渗透；底漆层中存在微裂纹，为介质扩散提供通道；预处理层由表面可溶性界面层与内层致密过渡膜组成，具备一定的物理屏障作用，并且附着力良好。腐蚀过程中，介质沿缺陷渗入并引发镀层溶解与析氢反应，产物在致密面漆阻挡下于层间聚集，最终导致漆膜鼓泡。[结论]通过增强底漆致密性、提高预处理层的稳定性及改善层间结合，可有效提升无铬彩涂板的耐蚀性，推动其在环保要求严苛的领域中应用。
Abstract：[Objective] The corrosion failure mechanisms of environmentally friendly pre-coated hot-dip galvanized sheet was studied to provide a theoretical basis for improving their corrosion resistance. [Method] The X-cut salt spray tests were conducted to simulate coating damage. The transport behavior of corrosive media and products and the blistering failure mechanism were studied by electrochemical impedance spectroscopy(EIS), polarization curve measurement, and scanning electron microscopy(SEM). [Result] The topcoat possesses a compact structure containing aluminum flake fillers, which creates a “labyrinth effect” that significantly retards the penetration of corrosive media. The primer coating contains microcracks that provide pathways for media diffusion. The pretreatment layer consists of an outer soluble interfacial film and an inner compact transition layer, offering a physical barrier and good adhesion. During corrosion, media infiltrate through defects, triggering zinc dissolution and hydrogen evolution reactions. The resulting products accumulate at the interface due to the blocking effect of the topcoat, ultimately leading to coating blistering. [Conclusion] The corrosion resistance of chromium-free pre-coated sheets can be effectively enhanced by improving the compactness of primer, the stability of pretreatment layer, and the adhesion of interlayer, thereby facilitating their application in the fields with stringent environmental policies.
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基本信息:
DOI：10.19289/j.1004-227x.2026.01.019
中图分类号:TG174.4
引用信息:
[1]刘昌文,董学强,王涛,等.环保无铬彩涂板表面腐蚀介质传输行为及涂层起泡失效机制研究[J].电镀与涂饰,2026,45(01):149-156.DOI:10.19289/j.1004-227x.2026.01.019.
基金信息:
四川省科技厅重点研发项目（2023YFG0248）; 攀钢集团攀枝花钢铁研究院有限公司合作项目（24H0262）