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The Enhancement Effect of Salt Bath Chromizing for P20 Steel

机译：P20钢盐浴铬化的增强效果

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摘要

The TD (Thermal Diffusion) salt bath process is used to obtain a super hard carbide coating on the material surface by utilizing the mechanism of metal thermal diffusion. In this paper, chromium carbide coating was prepared on P20 hot-pressing die steel by the TD salt bath chromizing process. Characterization of the modified surface layer was made by means of scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDS), a micro-hardness tester and an automatic scratch tester. The influence rules of different salt bath times and temperatures on the growth thickness of the cladding layer were explored through experiments, and the optimum salt bath process scheme was determined as a temperature of 960 °C and time of 6 h. The chromium carbide coating with a thickness similar to that of chromium plating was prepared, and the average thickness of the coating was about 8–10 μm. The results showed that hardness and bonding strength of chromium carbide coating are higher than that of electroplated chromium coating. The combination of chromium carbide coating and matrix is metallurgical, while the electroplated chromium coating is physical. Immersion corrosion test results show that both coatings have good corrosion resistance in a 65% nitric acid solution.
机译：Td（热扩散）盐浴工艺通过利用金属热扩散的机制来获得材料表面上的超硬碳化物涂层。本文通过TD盐浴铬化方法对P20热压模钢制备碳化铬涂层。通过扫描电子显微镜（SEM），能量分散X射线分析（EDS），微硬度测试仪和自动刮擦测试仪进行改性表面层的表征。通过实验探索不同盐浴时间的影响规则和包层层的生长厚度上的温度，最佳盐浴工艺方案被确定为960℃和6小时的温度。制备厚度与铬镀铬相似的碳化铬涂层，涂层的平均厚度约为8-10μm。结果表明，碳化铬涂层的硬度和粘合强度高于电镀铬涂层的硬度和粘合强度。碳化铬涂层和基质的组合是冶金，而电镀铬涂层是物理的。浸渍腐蚀试验结果表明，两种涂层在65％硝酸溶液中具有良好的耐腐蚀性。

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