ABSTRACT

In the present work, the authors designed a deposition process and prepared ternary Zn–Ni–Co alloy material over a mild steel substrate via direct current deposition using an acidic electrolyte for the development of good surface quality and corrosion resistance properties in metal finishing uses. The quality of coatings has been optimised, through implementation of different experimental conditions and parameters, respectively. The prepared specimens have been subjected to X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) with energy-dispersive X-ray spectroscopy (EDS). The XRD pattern revealed highly crystalline properties and FESEM revealed a bright and uniform deposit distribution with an aggregated spherical structure. Electrochemical studies through Tafel polarisation testing and electrochemical impedance spectroscopy (EIS) were carried out in 3.5% NaCl solution. The Tafel analysis revealed that Zn–Ni–Co alloy deposited with the highest corrosion resistance property was observed at a practical currect density of 1 A dm⁻². Thus, it can be possible to produce coated material for good corrosion resistance for machinery parts in automobile industries.

摘要

在目前的工作中，作者设计了一种沉积工艺，并通过以下方法在低碳钢基材上制备了三元 Zn-Ni-Co 合金材料使用酸性电解液进行直流沉积，以在金属精加工用途中开发良好的表面质量和耐腐蚀性能。通过分别实施不同的实验条件和参数，涂层的质量得到了优化。所制备的样品已经过 X 射线衍射 (XRD)、场发射扫描电子显微镜 (FESEM) 和能量色散 X 射线光谱 (EDS)。XRD 图案显示高度结晶特性，FESEM 显示具有聚集球形结构的明亮且均匀的沉积分布。通过 Tafel 极化测试和电化学阻抗谱 (EIS) 进行的电化学研究在 3.5% NaCl 溶液中进行。^-2。因此，可以生产用于汽车工业机械零件的具有良好耐腐蚀性的涂层材料。