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Microstructure and Corrosion Behavior of ZnO-Mg Coating on AISI 4140 Steel Fabricated by Spray Coating
Journal of Materials Engineering and Performance ( IF 2.3 ) Pub Date : 2020-09-14 , DOI: 10.1007/s11665-020-05099-9
T. Ramkumar , M. Selvakumar , M. Mohanraj , P. Chandramohan , P. Narayanasamy

This paper aims to investigate the corrosion behavior of ZnO-Mg coatings on AISI 4140 steel using spray coating technology. Three different coating thicknesses of approximately ≈ 30, 60 and 90 µm are considered in this study. The structural and morphological properties of the coated samples are characterized using optical microscope, scanning electron microscope (SEM), x-ray diffraction analysis, atomic force microscope and energy-dispersive spectroscopy analysis. The corrosion behavior is evaluated in a chloride environment by Tafel and electrochemical impedance spectroscopy (EIS) techniques as a function of coating thickness. The acquired results exhibit that the introduction of ZnO-Mg coating improves corrosion resistance of AISI 4140. ZnO-Mg coating acts as a stabilizer in the electrolyte and maintains electrochemical stability. After prolonged polarization, the coating exhibits higher impedance in the subsequent EIS results compared to that of the substrate. The corroded surfaces of AISI 4140 are analyzed using SEM for surface morphological changes.



中文翻译:

喷涂法在AISI 4140钢上制备ZnO-Mg涂层的组织和腐蚀行为

本文旨在通过喷涂技术研究AISI 4140钢上ZnO-Mg涂层的腐蚀行为。在这项研究中考虑了三种不同的涂层厚度,分别约为≈30、60和90 µm。使用光学显微镜,扫描电子显微镜(SEM),X射线衍射分析,原子力显微镜和能量色散光谱分析对涂层样品的结构和形态特性进行表征。在氯化物环境中,通过Tafel和电化学阻抗谱(EIS)技术评估了腐蚀行为随涂层厚度的变化。获得的结果表明,引入ZnO-Mg涂层可以改善AISI 4140的耐腐蚀性。ZnO-Mg涂层在电解质中起稳定剂的作用并保持电化学稳定性。长时间极化后,与基板相比,该涂层在随后的EIS结果中显示出更高的阻抗。使用SEM分析AISI 4140腐蚀的表面的表面形态。

更新日期:2020-09-15
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