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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Pre-treatment on Roughness and Hydrophobicity of Electro-Etched Steel with Improved Corrosion Resistance
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Effect of Pre-treatment on Roughness and Hydrophobicity of Electro-Etched Steel with Improved Corrosion Resistance

机译：预处理对电蚀刻钢的粗糙度和疏水性的影响改善耐腐蚀性

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摘要

A hydrophobic steel surface was created by a simple electro-etching technique using a cobalt sulfate bath. The effect of surface pre-treatment on the hydrophobicity and surface roughness was investigated. The wettability and roughness of the surface were determined by water contact angle (WCA) and atomic force microscopy (AFM), respectively. Accordingly, the sample abraded with 800 grit sandpaper followed by electro-etching process was selected as the optimum sample with the highest roughness and WCA (S-a = 28.4 nm,R-a = 35.4 nm, and WCA = 144 +/- 1.6 degrees, respectively). The morphology and cross-sectional images of the hydrophobic surface were investigated using field-emission scanning electron microscopy (FESEM). FESEM images showed a micro/nanostructured surface. The resulted hydrophobicity was attributed to the high roughness and overhanging structure obtained through this method. Furthermore, by using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests, the corrosion behavior of the samples was investigated. It was revealed that the surface hydrophobicity improved the corrosion resistance by increasing the polarization resistance (from 726 to 1598 ohm cm(2)) and decreasing the corrosion current density (from 0.025 to 0.012 mA cm(-2)). The simplicity of creating a hydrophobic surface with the improved corrosion behavior, the availability, and the low cost of the materials used to develop this approach makes it a proper candidate for large-scale and industrial applications.
机译：使用硫酸钴浴通过简单的电蚀刻技术产生疏水性钢表面。研究了表面预处理对疏水性和表面粗糙度的影响。表面的润湿性和粗糙度分别通过水接触角（WCA）和原子力显微镜（AFM）测定。因此，选择用800粒砂纸磨的样品，然后选择电蚀刻过程，作为最高粗糙度和WCA的最佳样品（SA = 28.4nm，Ra = 35.4nm，以及WCA = 144 +/- 1.6度） 。使用现场 - 发射扫描电子显微镜（FESEM）研究了疏水表面的形态和横截面图像。 FeSEM图像显示微/纳米结构表面。得到的疏水性归因于通过该方法获得的高粗糙度和悬垂结构。此外，通过使用电位动力学偏振和电化学阻抗谱（EIS）测试，研究了样品的腐蚀行为。揭示了表面疏水性通过增加偏振电阻（从726至1598欧姆（2））来提高耐腐蚀性，并降低腐蚀电流密度（0.025至0.012 mA cm（-2））。用改进的腐蚀行为，可用性和用于开发这种方法的材料的低成本来制造疏水表面的简单性使其成为大规模和工业应用的适当候选者。

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