Enhanced heat and corrosion resistance of organic silicone coatings by dual shielding effects of Zn powder

IF 5.5 3区材料科学 Q1 ELECTROCHEMISTRY Electrochimica Acta Pub Date : 2024-11-07 DOI:10.1016/j.electacta.2024.145329

Chuangchuang Zhang, Songmei Li, Jian Xiao, Rong Wang, Xiaoyun Xu, Jianhua Liu, Mei Yu

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Abstract

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.

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通过锌粉的双重屏蔽效应增强有机硅涂层的耐热性和耐腐蚀性

研究人员开发了添加不同锌含量的有机硅涂层，以增强在不同腐蚀环境中的耐热性和耐腐蚀性。研究发现，锌会影响涂层与基材之间的附着强度，而添加 40% Zn 的涂层具有最佳的耐热性和耐腐蚀性。在高温环境中，锌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 通过充当阳极和提供阴极保护，为钢基体提供化学屏蔽效果。在高温-盐雾循环环境中，Zn 的常温腐蚀产物还能填补涂层缺陷，增强高温阶段的耐热性。在高温下生成的氧化锌优先吸附常温阶段的腐蚀介质，阻碍其向基底扩散，从而同时增强了涂层的耐热性和耐腐蚀性。

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来源期刊

Electrochimica Acta 工程技术-电化学

CiteScore

11.30

自引率

6.10%

发文量

1634

审稿时长

41 days

期刊介绍： Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.