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1镀液循环流量对封闭循环电沉积Ni-SiC复合镀层的影响显示文摘目的研究封闭式镀液循环装置中不同镀液循环流量对Ni-SiC复合镀层的影响规律,优化镀液循环流量参数。方法以Q235管状工件为待镀基体,以添加SiC颗粒的改良瓦特镀液为母液,在自主研发的封闭式镀液循环电镀装置中以0.3、0.5、0.7 m3/h的镀液循环流量于管件内壁制备Ni-SiC复合镀层,通过SEM检测、XRD测试、硬度测试和摩擦磨损性能测试等手段,对各Ni-SiC复合镀层宏微观形貌、厚度、成分、结构、硬度和耐磨性进行分析研究。结果在0.5 m^(3)/h流量条件下,镀层厚度为32.98μm,SiC颗粒含量为15.37%,镀层晶粒尺寸和硬度分别为10.84 nm和704HK_(0.245),该条件下制备的Ni-SiC复合镀层具有最佳耐磨性,摩擦系数为0.41,体积磨损率仅2.83×10^(-5) mm^(3)/Nm。结论在不同镀液循环流量参数下,采用该封闭式循环电镀装置,均可制得均匀完整的Ni-SiC复合镀层。随镀液循环流量的升高,镀层厚度和SiC颗粒体积含量均降低,镀层颜色金属光泽增强,镀层晶粒尺寸先减小、后增大,镀层硬度则先升高、后降低。李浪 谢发勤 吴向清 宋嘉蕾 2021装备环境工程2021,18,8:2
2Influence Mechanism of Sulfide Ions during Manganese Electrodeposition显示文摘Influence mechanism of sulfide ions(S^2-) during manganese electrodeposition from sulphate electrolyte was investigated. Under the experimental conditions, S^2- ion concentration and electrolyte pH represented significant multiple effects on the cathode current efficiency. Scanning electron microscope(SEM) indicated that electrodeposition manganese layer(EML) became refinement as S^2- ion concentration was increased. X-ray Diffraction(XRD) displayed that S^2- ion had negligible influence on the preferred orientation of the crystalline layer of the EML. S^2- ion had no influence on the chemical composition of EML. S^2- ion could improve the corrosion resistance of EML. The interaction mechanism of S^2- ion with manganese electrodeposition was systematically explored by analysing E-pH diagram, cyclic voltammetry curve, cathode polarization curve and electrochemical impedance method.薛建荣 ZHONG Hong WANG Shuai LONG Dongping 2019Journal of Wuhan University of Technology(Materials Science)2019,34,6:0
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