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首页> 外文期刊>Journal of Materials Engineering and Performance >Studies on Corrosion-Resistant Behavior of Siliconized Epoxy Interpenetrating Coatings over Mild Steel Surface by Electrochemical Methods
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Studies on Corrosion-Resistant Behavior of Siliconized Epoxy Interpenetrating Coatings over Mild Steel Surface by Electrochemical Methods

机译：电化学方法研究低碳钢表面硅化环氧互穿涂层的耐腐蚀性能

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摘要

Solvent-free siloxane-modified epoxy coatings were developed by the interpenetrating technique using epoxy resin as base (DGEBA, GY 250, Ciba-Geigy) and hydroxyl-terminated polydimethylsiloxane as modifier (commercially known as silicone) with gamma-aminopropyltriethoxysilane as cross-linker, dibutyltin-dilaurate as catalyst, and 25 percent zinc powder as additive. Hexamethylenediamine (Aldrich) and polyamidoamine (HY 840, Ciba-Geigy) were used as curatives for the siliconized epoxy coatings containing 25 percent zinc powder. The corrosion-resistant behavior of these coating systems is assessed by electrochemical methods such as electrochemical potential measurements, potentiodynamic polarization, and electrochemical impedance spectroscopic methods. Based on the results obtained from the electrochemical potential measurements for epoxy and siliconized epoxy coating systems, few samples, namely AX_4 and BX_4, have been found to be the best corrosion-resistant coating systems, and they are used for potentiodynamic polarization measurements, electrochemical impedance, and salt-spray tests. The experimental results reveal that the siloxane (10 percent) modified epoxy coating system (AX_4) with 25 percent zinc powder cured by hexamethylenediamine offers the maximum corrosion protection to the steel surface rather than the polyamidoamine-cured system (BX_4). The better protective action offered by the coating system (AX4) is mainly imparted by the reaction of aliphatic amine hydrogens with oxirane groups of the epoxy resin, which gives coating films with a high cross-link density. The observation is further supported by a capacitive behavior in the Nyquist plot and no spreading of visible corrosion product in the salt-spray test.
机译：无溶剂硅氧烷改性的环氧涂料是通过互穿技术开发的，该方法使用环氧树脂作为基础（DGEBA，GY 250，Ciba-Geigy）和端羟基的聚二甲基硅氧烷作为改性剂（商业上称为有机硅），以γ-氨基丙基三乙氧基硅烷为交联剂。 ，二月桂酸二丁基锡为催化剂，锌粉为25％作为添加剂。六亚甲基二胺（Aldrich）和聚酰胺基胺（HY 840，Ciba-Geigy）被用作含25％锌粉的硅化环氧涂料的固化剂。这些涂层系统的耐腐蚀性能通过电化学方法进行评估，例如电化学电势测量，电位动力学极化和电化学阻抗谱法。根据环氧和硅化环氧涂料体系的电化学电势测量结果，很少发现AX_4和BX_4样品是最佳的耐腐蚀涂料体系，它们可用于电势极化测量，电化学阻抗和盐雾测试。实验结果表明，用六亚甲基二胺固化的具有25％锌粉的硅氧烷（10％）改性环氧涂料体系（AX_4）对聚酰胺表面提供了最大的腐蚀保护，而不是聚酰胺胺固化的体系（BX_4）。涂料体系（AX4）提供的更好的保护作用主要是由于脂肪族胺氢与环氧树脂的环氧乙烷基团的反应，使涂膜具有高交联密度。奈奎斯特图中的电容行为以及盐雾测试中没有可见的腐蚀产物扩散，进一步支持了这一观察结果。

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