Abstract The wear resistance of organic coatings is a key factor in preserving their barrier effect against corrosion. In this research, epoxy-based powder coatings were loaded with different percentages of SiO2 nanoparticles (1, 2 and 3% by wt.) to improve their wear resistance. The innovative mixing method used to homogenize the nanoparticles in the matrix was a hot mixer. The modified organic powders were applied by electrostatic gun on carbon steel substrates. After curing, sliding wear tests were performed at 5 N using reciprocating wear equipment, and measuring the coefficient of friction (COF). The wear mechanism was analyzed and the width and the depth of each track were measured through scanning electron microscopy (SEM) and optoelectronic microscopy. Wear results were analyzed considering the increase in hardness and scratch resistance, and the decrease in ductility of the coating caused by the nanoparticles. As no wear track was found on 3% SiO2 containing coatings under this load due to its properties, it was decided to perform more tests at higher loads to delve further into its wear mechanisms. This coating withstands wear with very small damage under moderate loads, but starts to show abrasive wear and high COF when the load increases.

中文翻译：

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环氧粉末涂料与纳米颗粒热混合以改善其磨损

摘要 有机涂层的耐磨性是保持其防腐蚀屏障效果的关键因素。在这项研究中，环氧基粉末涂料加载了不同百分比的 SiO2 纳米粒子（1、2 和 3% 重量百分比）以提高其耐磨性。用于在基质中均质化纳米粒子的创新混合方法是热混合器。通过静电喷枪将改性有机粉末喷涂在碳钢基材上。固化后，使用往复磨损设备在 5 N 下进行滑动磨损试验，并测量摩擦系数 (COF)。分析磨损机理，并通过扫描电子显微镜（SEM）和光电显微镜测量每个轨迹的宽度和深度。考虑到硬度和抗划伤性的增加，对磨损结果进行了分析，以及由纳米颗粒引起的涂层延展性的降低。由于在此负载下，含 3% SiO2 的涂层由于其特性而未发现磨损痕迹，因此决定在更高负载下进行更多测试以进一步研究其磨损机制。这种涂层在中等载荷下能够承受磨损，损伤很小，但当载荷增加时开始表现出磨粒磨损和高 COF。