ABSTRACT

ZnFe and ZnFe/BN composite coatings were successfully electrodeposited on 304 stainless steel substrates by pulse electrodeposition technique. The effect of various concentrations of BN particles in the plating solution on the structural, hardness and corrosion properties of electrodeposited ZnFe alloy and ZnFe/BN composites were investigated. The deposition process and electrochemical behaviour of alloy and composite coatings were analysed by the Cyclic Voltammetry (CV) method. X-ray diffraction (XRD), and scanning electron microscopy (SEM) were used for the structural, and morphological characterisation of the coatings. Vickers micro hardness indentation was used to determine the hardness of the deposits. The corrosion behaviour of ZnFe alloy and ZnFe/BN composites was investigated by open circuit potential (OCP), Tafel plots, and electrochemical impedance spectroscopy (EIS) methods. As the BN particle content in ZnFe/BN composite coatings rose, the microhardness, and corrosion resistance of coatings increased, which was due to the function of grain refinement and changing dispersion strengthening. Meanwhile, grain sizes were strongly affected from the presence of BN particles and their content. The ZnFe/BN composite coatings with the BN particle concentration of 20 g L⁻¹ had the highest corrosion resistance, and microhardness.

摘要

采用脉冲电沉积技术在304不锈钢基材上成功电沉积了ZnFe和ZnFe/BN复合涂层。研究了镀液中不同浓度的BN颗粒对电沉积ZnFe合金和ZnFe/BN复合材料的结构、硬度和腐蚀性能的影响。采用循环伏安法（CV）分析了合金和复合涂层的沉积过程和电化学行为。X 射线衍射 (XRD) 和扫描电子显微镜 (SEM) 用于涂层的结构和形态表征。维氏显微硬度压痕用于确定沉积物的硬度。ZnFe合金和ZnFe/BN复合材料的腐蚀行为通过开路电位（OCP）、Tafel图、和电化学阻抗谱（EIS）方法。随着 ZnFe/BN 复合涂层中 BN 颗粒含量的增加，涂层的显微硬度和耐腐蚀性能提高，这是由于晶粒细化和改变弥散强化的作用。同时，晶粒尺寸受到BN颗粒及其含量的强烈影响。BN颗粒浓度为20 g·L的ZnFe/BN复合涂层^-1具有最高的耐腐蚀性和显微硬度。