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Wear Resistance of Electrodeposited Ni–Mn–SiC Composite Coatings

机译：电沉积Ni-Mn-SiC复合涂层的耐磨性

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摘要

To improve the wear resistance of type 45 steel surfaces, Ni–Mn alloy coatings are prepared through electrodeposition under different sodium citrate concentrations based on which SiC particles of varying concentrations are added to prepare Ni–Mn–SiC composite coatings. The coatings are characterized by scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, microhardness testing, surface roughness meter, composite material surface performance testing, and laser scanning confocal microscopy. The results show that adding an appropriate concentration of sodium citrate into the electrolyte can significantly improve the Mn content in the coatings; however, an excessively high concentration increases the residual stress of the coatings and induces cracks on the surface. When the sodium citrate concentration is 40 g/L, the microhardness and wear resistance of the coatings are optimum. The average microhardness of the Ni–Mn alloy coatings is 522.8 HV0.05, and the minimum scratch area of the wear mark is 9526.26 μm2. The addition of SiC particles improves the surface integrity of the composite coatings and further improves the microhardness and wear resistance of the coatings. The composite coating has a maximum average microhardness value of 648.7 HV0.05 for SiC particle concentration of 4 g/L; this value is nearly 25% higher than that of pure Ni–Mn alloy coatings; the minimum scratch area of the wear mark is reduced to 7160.46 μm2.
机译：为了提高45型钢表面的耐磨性，通过在不同的柠檬酸钠浓度下通过电沉积制备Ni-Mn合金涂层，基于加入的不同浓度的SiC颗粒以制备Ni-Mn-SiC复合涂层。涂层的特征在于扫描电子显微镜，能量分散光谱，X射线衍射，微硬度测试，表面粗糙度计，复合材料表面性能测试和激光扫描共聚焦显微镜。结果表明，将柠檬酸钠浓度添加到电解质中可以显着改善涂层中的Mn含量;然而，过高的浓度增加了涂层的残余应力并在表面上诱导裂缝。当柠檬酸钠浓度为40g / l时，涂层的显微硬度和耐磨性是最佳的。 Ni-Mn合金涂层的平均微硬度为522.8 HV0.05，耐磨标记的最小划痕区域为9526.26μm2。添加SiC颗粒改善了复合涂层的表面完整性，并进一步改善了涂层的显微硬度和耐磨性。复合涂层的最大平均微硬度值为648.7 HV0.05，用于4g / L的SiC颗粒浓度;该值比纯Ni-Mn合金涂层高近25％;磨损标记的最小划痕区域减少到7160.46μm2。

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