Anticorrosive deposits are a valuable approach to defending against corrosion from mild steel structures/machinery equipment. The Zn–Ni–Co coating has been deposited on low carbon steel surfaces using environment friendly optimized acidic chloride bath with ZnCl2·6H2O, NiCl2·6H2O, CoCl2·6H2O, sulphanilic acid (C6H7NO3S) and gelatin (C6H8O6). The standard Hull cell technique has been adopted for the optimization of bath components and experimental conditions, for the superior corrosion resistant coating. The corrosion test with potentiodynamic polarization method was performed to investigate the role of pH on the film quality and corrosion performances of the films. Further, the effect of current densities on corrosion resistance, thickness and hardness, have been investigated. Cyclic voltammetry technique has been used to test the electrochemical properties of the Zn–Ni–Co coating in acidic solutions. The results revealed that the increase in the current density favoured the increase in Ni and Co content in the deposit, showed higher corrosion resistance and higher cathodic current efficiency. The structural and morphological characteristics of the alloy coating have been obtained through scanning electron microscopy and X-ray diffraction techniques. The atomic force microscope was used to examine the topographic structure of the coating. X-ray Photoelectron spectroscopy was used to determine the chemical composition of alloy coatings and verified by energy dispersive X-ray analysis. The results indicate that a new and low-cost chloride bath for Zn–Ni–Co coating exhibit superior corrosion resistance properties and can be implement in various industrial applications such as automobiles, machine tools etc.

中文翻译：

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酸性氯化物浴对Zn-Ni-Co涂层耐蚀性的电化学研究

防腐沉积物是防止低碳钢结构/机械设备腐蚀的一种有价值的方法。Zn-Ni-Co 涂层已使用环境友好的优化酸性氯化物浴，包括 ZnCl2·6H2O、NiCl2·6H2O、CoCl2·6H2O、对氨基苯磺酸 (C6H7NO3S) 和明胶 (C6H8O6) 沉积在低碳钢表面。采用标准赫尔槽技术优化镀液成分和实验条件，以获得优异的耐腐蚀涂层。采用动电位极化法进行腐蚀试验，研究pH值对薄膜质量和腐蚀性能的影响。此外，还研究了电流密度对耐腐蚀性、厚度和硬度的影响。循环伏安技术已用于测试 Zn-Ni-Co 涂层在酸性溶液中的电化学性能。结果表明，电流密度的增加有利于沉积物中Ni和Co含量的增加，表现出更高的耐腐蚀性和更高的阴极电流效率。通过扫描电子显微镜和X射线衍射技术获得了合金涂层的结构和形态特征。原子力显微镜用于检查涂层的形貌结构。X 射线光电子能谱用于确定合金涂层的化学成分，并通过能量色散 X 射线分析进行验证。