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Multivariable Analysis of Electrodeposited Silane/Zinc Coating—Improvement of Cathodic Protection of Steel
Journal of Materials Engineering and Performance ( IF 2.3 ) Pub Date : 2020-09-16 , DOI: 10.1007/s11665-020-05088-y
Victor Hugo C. A. Rego , Gabriel Batalha Leoni , Simone Louise D. C. Brasil

In order to enhance corrosion protection efficiency of electrodeposited sol–gel zinc/silica coatings, this paper resorted to a central composite design as a tool to improve cathodic protection effectiveness time and electrochemical tests to understand the film protection mechanism. Coatings were produced by electrodeposition of a mixture of tetraethoxysilane (TEOS) and Zn2+ onto carbon steel. The amount of silane agent, concentration of zinc nitrate and the applied potential were chosen as the variables to be studied. Open-circuit potentials in NaCl 3.5% (wt.) solution were monitored to verify the duration of cathodic protection, according to ISO 15589-2:201. Microstructures characterization and distribution of deposited zinc were determined by scanning electron microscopy and energy-dispersive x-ray spectroscopy. At last, coating degradation was analyzed by potentiodynamic polarization curves, electrochemical impedance spectroscopy and visual inspection of corrosion products. Results revealed films whose cathodic protection endured more than 600 min of immersion when higher concentrations of Zn2+ were combined with lower potentials and lower silane content. Furthermore, visual inspection of immersed specimens showed no corrosion signs for carbon steel samples deposited with zinc and TEOS, even after 20 h, providing a superior protection when compared to the sample deposited solely with zinc.



中文翻译:

电沉积硅烷/锌涂层的多变量分析—改善钢的阴极保护

为了提高电沉积溶胶-凝胶锌/二氧化硅涂层的腐蚀防护效率,本文采用中央复合设计作为一种工具,以延长阴极保护的有效时间,并通过电化学测试来了解膜的保护机理。通过电沉积四乙氧基硅烷(TEOS)和Zn 2+的混合物来生产涂层到碳钢上。选择硅烷试剂的量,硝酸锌的浓度和施加的电势作为要研究的变量。根据ISO 15589-2:201,在3.5%(wt。)的NaCl溶液中监测开路电势,以验证阴极保护的持续时间。通过扫描电子显微镜和能量色散X射线光谱法确定沉积锌的微观结构特征和分布。最后,通过电位动力学极化曲线,电化学阻抗谱和腐蚀产物的目测来分析涂层的降解。结果显示,当较高浓度的Zn 2+时,其阴极保护膜可承受600分钟以上的浸没。与较低的电势和较低的硅烷含量结合在一起。此外,对浸入式样品的目视检查表明,即使仅在20小时之后,对于沉积有锌和TEOS的碳钢样品也没有腐蚀迹象,与仅沉积锌的样品相比,该涂层提供了卓越的保护。

更新日期:2020-09-16
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