摘要
Cr-SiC nanocomposite coatings with various contents of SiC nanoparticles were prepared by electrodeposition in optimized Cr plating bath containing different concentrations of SiC nanoparticles. Direct current electrocodeposition technique was used to deposit chromium layers with and without SiC nanoparticles on mild carbon steel. The effects of current density, stirring rate and concentration of nanoparticles in the plating bath were investigated. Scanning electron microscopy was used to study surface morphology. Energy dispersive analysis technique was used to verify the presence of SiC nanoparticles in the coated layers. The corrosion behaviors of coatings were investigated by potentiodynamic polarization and electrochemical impedance spectroscopy methods in 0.05 mol/L HCl, 1 mol/L NaOH and 3.5% NaCl （mass fraction）, respectively. Microhardness measurements and pin-on- disc tribometer technique were used to investigate the wear behavior of the coatings.
在含SiC纳米颗粒的铬电镀液中,通过改变溶液中SiC纳米颗粒的含量,电沉积得到不同SiC纳米颗粒含量的Cr-SiC纳米复合材料涂层。采用直流共沉积技术在低碳钢基体上沉积得到纯Cr涂层和Cr-SiC纳米复合涂层。研究了电流密度、搅拌速度和SiC纳米颗粒浓度对电沉积的影响。用扫描电镜来研究涂层的表面形貌,用能谱分析检测Cr-SiC纳米复合涂层中SiC纳米粒,用动电位极化和电化学阻抗谱方法研究涂层在0.05mol/LHCl、1mol/LNaOH和3.5%NaCl中的腐蚀行为。用显微硬度计测量涂层的硬度和采用销-盘磨损试检研究涂层的磨损行为。
