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首页> 外文期刊>Journal of Materials Engineering and Performance >Multivariable Analysis of Electrodeposited Silane/Zinc Coating-Improvement of Cathodic Protection of Steel
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Multivariable Analysis of Electrodeposited Silane/Zinc Coating-Improvement of Cathodic Protection of Steel

机译：电沉积电沉积硅烷/锌涂层的多变量分析改进钢阴极保护

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摘要

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 Zn(2+)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 Zn(2+)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.
机译：为了提高电沉积溶胶 - 凝胶锌/二氧化硅涂层的耐腐蚀效率，本文采用了中央复合设计作为改善阴极保护效果时间和电化学测试以了解薄膜保护机制的工具。通过将四乙氧基硅烷（TEOS）和Zn（2+）的混合物电沉积在碳钢上产生涂层。选择硅烷试剂的量，硝酸锌浓度和施加电位作为待研究的变量。根据ISO 15589-2：201，监测NaCl 3.5％（WT。）溶液中的开放式电位以验证阴极保护的持续时间。通过扫描电子显微镜和能量分散X射线光谱法测定沉积锌的微观结构表征和分布。最后，通过电位偏振曲线，电化学阻抗光谱和腐蚀产品的目视检查分析涂层劣化。结果显示，当较高浓度的Zn（2+）与较低的电位和较低的硅烷含量合并时，薄膜的阴极保护待覆盖超过600分钟。此外，即使在20小时后，浸入锌和TEOS的碳钢样品的目视检查显示出含有锌和TEOS的碳钢样品，与单独用锌沉积的样品相比，提供优异的保护。

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