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首页> 外文期刊>Journal of Materials Engineering and Performance >Electrodeposition of Zn-Co-Mo Alloy on the Steel Substrate from Citrate Bath and Its Corrosion Behavior in the Chloride Media
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Electrodeposition of Zn-Co-Mo Alloy on the Steel Substrate from Citrate Bath and Its Corrosion Behavior in the Chloride Media

机译：从柠檬酸浴钢基材上的Zn-Co-Mo合金电沉积及其在氯化物介质中的腐蚀行为

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摘要

In this study, Zn-Co-Mo coatings were deposited on the steel substrate from a citrate bath after adjusting pH, concentration, and current density. The morphology, the content of alloying elements, and the thickness of deposits were studied. Deposition behavior of these ternary coatings was examined by cathodic polarization and cyclic voltammetry (CV) techniques. The synthesized deposits were investigated by scanning electron microscopy (SEM), energy-dispersive x-ray (EDX) analysis, x-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization methods. The results showed that the deposition potential of Zn-Co-Mo alloy was feasible in negative potentials higher than about -1.25 V versus Ag/AgCl. Moreover, the corrosion behavior of these coatings was found to be related to the extent of Mo as well as the local anodes and cathodes. The amount of molybdenum in the Zn-Co-Mo coating varied from 2.6 to 14 wt.% as a result of changing the pH. Based on the experimental findings, a narrow range of pH values between 5 and 5.5 could contribute to the high quality of coating in conjunction with the corrosion resistant alloy. Besides, the coatings with Mo element could show a passive-like behavior in the anodic region.
机译：在该研究中，调节pH，浓度和电流密度后，在柠檬酸浴中沉积在钢基板上的Zn-Co-Mo涂层。研究了形态学，合金元素的含量和沉积物的厚度。通过阴极偏振和环状伏安法（CV）技术检查这些三元涂层的沉积行为。通过扫描电子显微镜（SEM），能量分散X射线（EDX）分析，X射线衍射（XRD），电化学阻抗光谱（EIS）和电位偏振方法来研究合成的沉积物。结果表明，Zn-Co-Mo合金的沉积电位在高于-1.25V的负电位中可行，而Ag / AgCl是可行的。此外，发现这些涂层的腐蚀行为与Mo的程度以及局部阳极和阴极有关。 Zn-Co-Mo涂层中的钼的量从2.6〜14重量变化，由于改变pH值。基于实验结果，5至5.5之间的窄的pH值范围可以与耐腐蚀合金结合涂覆高质量的涂层。此外，具有Mo元素的涂层可以在阳极区域中显示出类似的行为。

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