Abstract

Nine distinct zinc-nickel-tin films with different compositions have been galvanostatically electrodeposited. The films have been characterized by scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). Their corrosion potentials and densities have been estimated using Tafel extrapolation. Next, the electrochemical behaviors of the films (deposited through the electrolytes containing 0, 6, 8, and 10 g/L SnCl₂∙6H₂O) have been examined based on cyclic voltammetry (CV) measurements. Further, these films have been immersed in 3.5wt% NaCl solution for 1 h, 1 d, 7 d, 14 d, 28 d, and 42 d followed by application of Tafel extrapolation and electrochemical impedance spectroscopy (EIS) tests on each aged sample. Finally, to analyze the morphologies and the compositions of the oxide films covering the surfaces of the 42-d aged films, FT-IR and SEM analyses have been performed. The results indicated that the Zn–Ni–Sn film produced through the bath including 6 g/L SnCl₂∙6H₂O exhibits superior corrosion resistance because of the high Ni content in the presence of Sn that promotes the barrier protection capability of the deposit.

中文翻译：

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Zn-Ni-Sn三元合金的表征与腐蚀研究

摘要

九个不同组成的锌-镍-锡薄膜已经被恒电流化电沉积。通过扫描电子显微镜（SEM）和能量分散光谱（EDS）对薄膜进行了表征。使用Tafel外推法估计了它们的腐蚀电位和密度。接下来，薄膜的电化学行为（通过含0、6、8和10 g / L SnCl ₂ ∙6H ₂的电解质沉积O）已根据循环伏安（CV）测量进行了检查。此外，将这些薄膜浸入3.5wt％NaCl溶液中1 h，1 d，7 d，14 d，28 d和42 d，然后对每个老化的样品进行Tafel外推法和电化学阻抗谱（EIS）测试。最后，为了分析覆盖42d时效膜表面的氧化膜的形貌和组成，进行了FT-IR和SEM分析。结果表明，通过镀液制备的包含6 g / L SnCl ₂ ∙6H ₂ O的Zn-Ni-Sn膜表现出优异的耐腐蚀性，这是因为在Sn的存在下Ni含量高，从而促进了沉积物的阻挡保护能力。 。