材料科学
腐蚀
介电谱
合金
成核
计时安培法
电化学
冶金
循环伏安法
扫描电子显微镜
锌
极化(电化学)
碳钢
溶解
化学工程
电解质
分析化学(期刊)
电极
复合材料
化学
有机化学
物理化学
色谱法
工程类
作者
J.M. Falcón,Idalina Vieira Aoki
标识
DOI:10.1016/j.surfcoat.2024.130603
摘要
The development of ZnCo alloys appeared as alternative for obtaining layers more resistant than the conventional zinc with a minimum increment of cost. The aim of this work is to study the electrodeposition mechanism of the ZnCo alloy on SAE 1020 carbon steel by cyclic voltammetry using two baths with different [Zn2+]/[Co2+] concentration ratios and also to evaluate the corrosion resistance in 0.1 mol L−1 NaCl of electrodeposits obtained potentiostatically using electrochemical techniques as electrochemical impedance spectroscopy, linear polarization resistance and potentiodynamic polarization curves. The voltammograms showed two anodic peaks attributed to dissolution of zinc rich ƞ-phases and cobalt, and a cathodic peak related to ZnCo alloy deposition. The nucleation mechanisms were examined by fitting the experimental data (chronoamperometry) into the Scharifker and Hills nucleation models. Scanning electron microscopy (SEM) showed that the electrodeposits obtained for the [Zn2+]/[Co2+] 9:1 ratio presented a structure in the form of hexagonal platelets in comparison to the electrodeposits with [Zn2+]/[Co2+] 12:1 ratio, which presented cauliflower-shaped structures. On the other hand, the electrochemical techniques proved that the electrodeposits obtained for the [Zn2+]/[Co2+] 9:1 ratio at potential of −1450 mV presented the best anticorrosive properties. Structural and chemical characterization of coatings was accomplished by XRD and XRF.
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