Abstract

Steels are majorly used for diverse structural applications; however, they suffer severe degradation in a corrosive environment which necessitates the need for a protective surface coating. In this paper, the electrochemical study of MgZnCa alloy thin film coating on an AISI 304 stainless steel was reported. The study intends to investigate the influence of coating thickness on the electrochemical performance of the ternary MgZnCa alloy thin film. The polarization results indicated that better corrosion resistance is achieved when the MgZnCa coating is applied on the steel substrate, as the corrosion current density of the 4 µm coating (0.28 mA/cm²) is lower than for the uncoated substrate (0.44 mA/cm²). As the MgZnCa coating thickness increases from 4 to 6 µm, a decrease in the corrosion density with a resultant increase in the corrosion potential was observed. The microstructural characterization revealed fewer corrosion attacks for the coated substrates as compared with the uncoated material with the presence of more degradation products. The corrosion resistance of the steel substrate is enhanced by the application of MgZnCa coating and increasing coating thickness is significantly beneficial.

摘要

钢材主要用于各种结构应用。然而，它们在腐蚀性环境中遭受严重降解，因此需要保护性表面涂层。本文报道了AISI 304不锈钢上MgZnCa合金薄膜涂层的电化学研究。该研究旨在研究涂层厚度对三元MgZnCa合金薄膜电化学性能的影响。极化结果表明，将MgZnCa涂层涂覆在钢基底上可获得更好的耐腐蚀性，因为4 µm涂层的腐蚀电流密度（0.28 mA / cm ²）低于未涂覆基底的腐蚀电流密度（0.44 mA / cm）^2个）。当MgZnCa涂层的厚度从4μm增加到6μm时，观察到腐蚀密度降低，结果腐蚀电位增加。与未涂层材料相比，具有更多降解产物的微观结构表征显示，涂层基材的腐蚀侵蚀更少。通过使用MgZnCa涂层可以提高钢基材的耐腐蚀性，并且增加涂层厚度是非常有利的。