ABSTRACT

Zinc layers are widely used for the protection of various classes of steel in atmospheric conditions. An improvement in corrosion performance of these layers may qualify them to be used in harsh marine conditions. In this study, two practical approaches, including alloying Zn with Co at different current densities and electrolyte temperatures, as well as deposition of multilayered Zn-Co films with various numbers of interlayers, were applied to fabricate corrosion barrier coatings on St 37 steel. The surface and cross-sectional morphologies of the coatings were studied using scanning electron microscopy (SEM). Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarisation tests were employed to compare the corrosion resistance of the alloy and multilayered coatings. Results illustrated that the best protection performance is obtained for multilayered coatings with top Co layer showing promise to be used in marine applications.

摘要

锌层广泛用于在大气条件下保护各类钢。这些层的腐蚀性能的改进可能使它们有资格在恶劣的海洋条件下使用。在这项研究中，两种实用的方法，包括在不同的电流密度和电解质温度下将 Zn 与 Co 合金化，以及沉积具有不同数量夹层的多层 Zn-Co 薄膜，被应用于在 St 37 钢上制造腐蚀屏障涂层。使用扫描电子显微镜（SEM）研究涂层的表面和横截面形貌。电化学阻抗谱 (EIS) 和动电位极化测试用于比较合金和多层涂层的耐腐蚀性。