Abstract

The cathodic plasma electrolytic deposition (CPED) was performed in alkaline electrolyte (glycerol + sodium nitrite) to form a nitrocarburized layer on AISI 1045 steel at constant voltage of 380 V. The results indicated that nitrocarburized layer was mainly comprised of ε–Fe_2–3N, γ'–Fe₄N, Fe₃C and Fe [Fe(CN)₆]₃ phases. As the treatment time was prolonged from 5 to 15 min, the surface porosity increased from 4.13 to 7.43%, while the thickness of layer was increased about 70% from 13 to 22 μm. On the contrary, the corrosion test revealed that the coatings prepared at 10 min treatment time had the best corrosion resistance with a value of 27 384 Ω.cm². Moreover, the mechanical behavior of coatings were also significantly increased by treatment time. The surface hardness increased 5 times, while the wear friction coefficient and wear rate of nitrocarburized layer were decreased to about \({\text{1/}}3~\) and \(1{\text{/}}6~\) respectively compared to that of the substrate.

中文翻译：

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处理时间对阴极等离子体电解沉积氮碳共渗膜层腐蚀和摩擦学性能的影响

摘要

在碱性电解液（甘油+亚硝酸钠）中进行阴极等离子体电解沉积（CPED），以380 V恒定电压在AISI 1045钢上形成氮碳共渗层。结果表明，氮碳共渗层主要由ε–Fe _{2– 3} N，γ'–Fe ₄ N，Fe ₃ C和Fe [Fe（CN）₆ ] ₃相。随着处理时间从5分钟延长到15分钟，表面孔隙率从4.13％增加到7.43％，而层的厚度从13μm增加到大约70％。与此相反，在腐蚀试验，发现该涂层在10分钟处理时间来制备具有最佳的耐腐蚀性的27 384的值Ω.cm ²。而且，涂层的机械性能也随着处理时间的增加而显着提高。表面硬度提高了5倍，而氮碳共渗层的磨损摩擦系数和磨损率降低到约\（{\ text {1 /}} 3〜\）和\（1 {\ text {/}} 6〜\ ）分别与基材相比。