Abstract

The tribological and electrochemical properties of various nanocomposite coatings of Ni–P–MoS₂–SiO₂ have been investigated. Such coatings were made by the electroless method and then heated at 400°C for 1 h. The amount of SiO₂ nanoparticles was a factor which changed Ni–P–MoS₂ coatings characteristics. In addition to microstructure evaluations and the phase detection, the microhardness, the friction coefficient, and wear behavior were studied for various coatings. Field emission scanning electron microscopy images demonstrated that SiO₂ nanoparticles were distributed uniformly in the Ni–P–MoS₂ matrix. The obtained results showed that when the concentration of SiO₂ nanoparticles in the deposition bath increased from 5 to 20 g/L, then the microhardness and the wear resistance increased as well. Besides, the friction coefficient reached the lowest value of 0.05. For nanocomposite coatings, the ratio of the friction coefficient to the square hardness was a proper parameter which could predict the wear behavior. Additionally, energy dispersive spectroscopy results showed that the content of SiO₂ nanoparticles in such coatings increased from 4.9 to 11.4 wt %. Corrosion tests demonstrated that the best corrosion resistance was observed for the nanocomposite coating when the concentration of SiO₂ nanoparticle was 20 g/L.

中文翻译：

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SiO 2纳米粒子的添加对热处理后Ni–P–MoS 2多组分镀层的摩擦学和电化学行为的影响

摘要

研究了各种Ni-P-MoS ₂ -SiO ₂纳米复合涂层的摩擦学和电化学性能。这种涂层是通过化学方法制成的，然后在400℃下加热1小时。SiO ₂纳米颗粒的数量是改变Ni–P–MoS ₂涂层特性的一个因素。除了微观结构评估和相检测之外，还研究了各种涂层的显微硬度，摩擦系数和磨损行为。场发射扫描电子显微镜图像表明，SiO ₂纳米颗粒均匀分布在Ni–P–MoS ₂基质中。所得结果表明，当SiO ₂浓度为沉积浴中的纳米颗粒从5 g / L增加到20 g / L，然后显微硬度和耐磨性也增加。此外，摩擦系数达到0.05的最低值。对于纳米复合涂层，摩擦系数与平方硬度之比是可以预测磨损行为的合适参数。另外，能量分散光谱结果表明，这种涂层中SiO ₂纳米颗粒的含量从4.9wt％增加到11.4wt％。腐蚀试验表明，当SiO ₂纳米颗粒的浓度为20 g / L时，纳米复合涂层具有最佳的耐腐蚀性。