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首页> 外文期刊>Journal of Materials Engineering and Performance >Improved Corrosion Protection of Aluminum Alloys by Electrodeposited Silanes
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Improved Corrosion Protection of Aluminum Alloys by Electrodeposited Silanes

机译：电沉积硅烷改善铝合金的防腐性能

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摘要

Organofunctional silanes recently have emerged as outstanding, environmentally friendly corrosion protectors for metal substrates, compared with conventional chromate treatments. A simple immersion technique is typically used to coat the metal surface with silane films. However, the thickness and uniformity of the films are uncontrolled in this process. This paper proposes a new deposition technique for the silane films on the metal surface, i.e., by electrodeposition. Hydrolyzed silanes are water-soluble, ionized molecules, so they can be deposited on metals by electrodeposition. Various combinations of silane mixtures were tested at different voltages, pH values, bath concentrations, and exposure times on panels of alloy aluminum and mirror-polished ferro-plate. The surface structure was characterized by scanning electron microscopy (SEM) and ellipsometry. The resistance of the film to corrosion was investigated by direct current (DC) polarization and electrochemical impedance spectroscopy (EIS) techniques. Electrodeposition results in a more organized and uniform film with fewer pores, compared with immersed or dipped films.
机译：与传统的铬酸盐处理相比，有机官能硅烷最近已成为金属基材的出色，环保型腐蚀防护剂。通常使用一种简单的浸入技术在金属表面涂上硅烷膜。然而，在该过程中，膜的厚度和均匀性不受控制。本文提出了一种在金属表面上的硅烷膜的新沉积技术，即通过电沉积。水解硅烷是水溶性的离子化分子，因此可以通过电沉积将其沉积在金属上。在不同的电压，pH值，浴液浓度和暴露时间在合金铝和镜面抛光的铁板上测试了各种硅烷混合物组合。表面结构通过扫描电子显微镜（SEM）和椭圆光度法表征。通过直流（DC）极化和电化学阻抗谱（EIS）技术研究了膜的耐腐蚀性。与浸入或浸入的薄膜相比，电沉积可形成具有更少孔隙的更有条理且更均匀的薄膜。

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