Abstract

The anti-corrosive Zn and Zn–Ni alloy coatings were electrodeposited on different copper substrates using an optimized sulphate electrolyte bath by conventional Hull cell method with glycine as an additive. The composition and surface morphology of the coatings were dependent on the current density. The co-deposition of Zn and Ni in Zn–Ni alloy showed anomalous behaviour, wherein, the deposition of less noble metal (Zn) was preferred over the more noble (Ni) metal. Anticorrosion properties of the coatings were experimented by electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization techniques in 3.5% NaCl medium. The Zn–Ni alloy exhibited 3 times better corrosion resistance than pure Zn coating under the same deposition conditions.

中文翻译：

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电沉积锌和锌-镍合金涂层改善氯离子介质腐蚀防护的比较研究

摘要

使用优化的硫酸盐电解质浴，通过传统的赫尔槽法，以甘氨酸为添加剂，将防腐锌和锌镍合金涂层电沉积在不同的铜基材上。涂层的组成和表面形态取决于电流密度。Zn-Ni合金中Zn和Ni的共沉积表现出异常的行为，其中，较稀有金属（Zn）的沉积比较稀有金属（Ni）的沉积更可取。通过电化学阻抗谱（EIS）和电位动力学极化技术在3.5％NaCl介质中测试了涂层的防腐性能。在相同的沉积条件下，Zn-Ni合金的耐腐蚀性是纯锌涂层的3倍。