Organic silicone coatings added with varying Zn content were developed to enhance heat and corrosion resistance in different corrosive environments. Zn was revealed to affect the adhesion strength between the coating and the substrate, and the 40% Zn-added coating demonstrated the best heat and corrosion resistance. In high-temperature environments, the volume expansion and melting deformation of Zn filled the defects of the coating and enhanced the physical shielding effect of the coating. In ambient-temperature environments, Zn provided the chemical shielding effect to the steel substrate by acting as an anode and providing cathodic protection. In high temperature-salt spray cyclic environments, the ambient-temperature corrosion products of Zn also filled the defects of the coating and enhanced the heat resistance in the high-temperature stage. ZnO generated at high temperatures preferentially adsorbed corrosive mediums in the ambient-temperature stage, hindering their diffusion to the substrate, thereby simultaneously enhancing the heat and corrosion resistance of the coating.

中文翻译：

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通过 Zn 粉末的双重屏蔽效果增强有机硅涂层的耐热性和耐腐蚀性


添加了不同 Zn 含量的有机硅涂层旨在增强不同腐蚀环境中的耐热性和耐腐蚀性。发现 Zn 会影响涂层与基材之间的粘合强度，而 40% 的 Zn 添加涂层表现出最佳的耐热性和耐腐蚀性。在高温环境下，Zn 的体积膨胀和熔融变形填补了涂层的缺陷，增强了涂层的物理屏蔽效果。在常温环境中，Zn 通过充当阳极并提供阴极保护，为钢基材提供化学屏蔽效果。在高温-盐雾循环环境中，Zn 的环境温度腐蚀产物也填补了涂层的缺陷，增强了高温阶段的耐热性。在高温下生成的 ZnO 在环境温度阶段优先吸附腐蚀性介质，阻碍它们扩散到基材，从而同时增强涂层的耐热性和耐腐蚀性。