Abstract

This work is devoted to the deposition of Cr₃C₂ chromium carbide powder on steel 35 by electrospark treatment in titanium granules. Three mixtures of granules containing Cr₃C₂ powder were prepared from 7.4 to 15.6 vol %. X-ray phase analysis of coatings showed the predominance of the Cr₇C₃ phase, which is the product of the decarbidation of Cr₃C₂ chromium carbide when it interacts with the iron of the substrate. With an increase in the powder content in the mixture of granules, the microhardness of the coatings increased from 8.2 to 9.8 GPa. The average coefficient of friction of the coatings ranged from 0.42 to 0.68. The wear resistance of coatings in dry wear mode was 20–57 times higher than that of steel 35. Polarization tests of coatings in 3.5% NaCl solution showed significantly lower corrosion potential and current, and higher resistance to polarization compared to steel 35. Study of heat resistance at a temperature of 700°C showed that the use of coatings on steel 35 increases the resistance of its surface to high-temperature gas corrosion by 14–18 times per 100 h of testing. The tests carried out have shown that the optimal content of Cr₃C₂ powder in a mixture with granules is in the range of 11.7–15.6 vol %.

中文翻译：

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电火花沉积获得的基于碳化铬Cr 7 C 3的耐磨耐腐蚀涂层

摘要

这项工作致力于通过在钛粒中进行电火花处理在钢35上沉积Cr ₃ C ₂碳化铬粉末。制备了7.4体积％至15.6体积％的包含Cr ₃ C ₂粉末的三种颗粒混合物。涂层的X射线相分析表明Cr ₇ C ₃相占优势，这是Cr ₃ C ₂脱碳的产物碳化铬与基材的铁相互作用时。随着颗粒混合物中粉末含量的增加，涂层的显微硬度从8.2 GPa增加到9.8 GPa。涂层的平均摩擦系数为0.42至0.68。在干磨模式下，涂层的耐磨性是35钢的20-57倍。与3.5钢相比，在3.5％NaCl溶液中的涂层极化测试显示出明显更低的腐蚀电位和电流，以及更高的抗极化性。在700°C的温度下的耐热性表明，每35小时进行一次测试，在钢35上使用涂层可使表面抗高温气体腐蚀的能力提高14到18倍。进行的测试表明，Cr ₃ C的最佳含量_2种粉末与颗粒的混合物的体积百分比在11.7–15.6之间。