This study aims at producing zinc (Zn)-rich epoxy ester (EE) paints for cold galvanizing of mild steel. Zn particles with a narrow particle size distribution of 1μm to 5μm were dispersed in EE resin by vacuum centrifuge mixer. The effect of Zn concentration in EE resin on cathodic protection ability of resulting paints was studied. Galvanic corrosion protection ability of the paints was studied in 3.5% (mass ratio) NaCl solution using electrochemical characterization techniques such as open circuit potential (OCP), Tafel analysis and electrochemical impedance spectroscopy (EIS). The results showed that cathodic protection ability depends on the loading of Zn particles in the EE and it is effective when the mass fraction of Zn was equal to or exceeded 90%. At this concentration, Zn particles developed interconnecting conducting networks as determined by scanning electron microscopy (SEM) which were responsible for the galvanic effect of the coating. The EE paints developed at mass ratio below 90% behaved as a conventional organic barrier coating and did not show any cathodic protection effect due to the lack of contact between Zn particles. The EE paint showed good resistance to abrasion and wear. The electrochemical behavior of Zn-rich EE paint (with cathodic protection ability) developed in this study was compared with commercial acrylic-based “cold galvanized paint” (Roval). EE-based “cold galvanized paints” were found to be more protective and long lasting compared to commercial “cold galvanized paints”.

中文翻译：

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低碳钢冷镀锌用富锌环氧树脂涂料的腐蚀研究

本研究旨在生产用于低碳钢冷镀锌的富锌 (Zn) 环氧酯 (EE) 涂料。粒径分布窄的 Zn 颗粒为 1μ米到 5μm通过真空离心混合器分散在EE树脂中。研究了EE树脂中Zn浓度对所得涂料阴极保护能力的影响。采用开路电位 (OCP)、塔菲尔分析和电化学阻抗谱 (EIS) 等电化学表征技术，在 3.5%（质量比）NaCl 溶液中研究了涂料的电偶腐蚀防护能力。结果表明，阴极保护能力取决于EE中Zn颗粒的负载量，当Zn的质量分数等于或超过90%时有效。在这个浓度下，通过扫描电子显微镜 (SEM) 确定，Zn 颗粒形成了相互连接的导电网络，这导致了涂层的电流效应。以低于 90% 的质量比开发的 EE 涂料表现为传统的有机阻隔涂层，由于锌颗粒之间缺乏接触，因此没有显示出任何阴极保护效果。EE涂料显示出良好的耐磨性和耐磨性。将本研究中开发的富锌 EE 涂料（具有阴极保护能力）的电化学行为与商用丙烯酸基“冷镀锌涂料”（Roval）进行了比较。与商业“冷镀锌漆”相比，基于 EE 的“冷镀锌漆”被发现更具保护性和持久性。将本研究中开发的富锌 EE 涂料（具有阴极保护能力）的电化学行为与商用丙烯酸基“冷镀锌涂料”（Roval）进行了比较。与商业“冷镀锌漆”相比，基于 EE 的“冷镀锌漆”被发现更具保护性和持久性。将本研究中开发的富锌 EE 涂料（具有阴极保护能力）的电化学行为与商用丙烯酸基“冷镀锌涂料”（Roval）进行了比较。与商业“冷镀锌漆”相比，基于 EE 的“冷镀锌漆”被发现更具保护性和持久性。