环氧磷酸酯/水性环氧涂层的耐蚀性能

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引用本文:	丁纪恒，刘栓，顾林，赵海超，余海斌.环氧磷酸酯/水性环氧涂层的耐蚀性能[J].中国表面工程,2015,28(2):126~131
	DING Jiheng, LIU Shuan, GU Lin, ZHAO Haichao, YU Haibin.Corrosion Resistance of Epoxy Phosphate/Waterborne Epoxy Coatings on Steel[J].China Surface Engineering,2015,28(2):126~131

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环氧磷酸酯/水性环氧涂层的耐蚀性能
丁纪恒，刘栓，顾林，赵海超，余海斌^1,2
1. 中国科学院宁波材料技术与工程研究所 a. 中国科学院海洋新材料与应用技术重点实验室, b. 浙江省海洋材料与防护技术重点实验室, 浙江宁波315201;2. 南京理工大学化工学院, 南京 210094

摘要:

为研究水性环氧涂层缓蚀剂的制备及其耐蚀性能，采用化学法将磷酸接到双酚A环氧树脂上，并与N,N二甲基乙醇胺中和制备水性环氧磷酸酯。将环氧磷酸酯添加到双组份水性环氧树脂中制备3种环氧磷酸酯/水性环氧涂层(E44, 0.2% PE44和0.5% PE44)。采用极化曲线和交流阻抗谱技术研究了环氧磷酸酯/水性环氧树脂对Q235钢基体在3.5%NaCl溶液中的防护性能。结果表明：浸泡24 h后，0.2% PE44/碳钢体系的自腐蚀电流密度(0.431 μA/cm2)低于E44/碳钢体系(0.928 μA/cm2)和0.5% PE44/碳钢体系(0.553 μA/cm2); 在浸泡 24 h内，3种涂层的涂层电容Qc逐渐增大，涂层电阻Rc和电荷转移电阻Rct逐渐较小，环氧磷酸酯可以显著提高纯水性环氧的Rc和Rct，进而提高水性环氧的耐蚀性能。当水性环氧树脂中环氧磷酸酯的含量为0.2%时，其防护性能较好。

关键词: 环氧磷酸酯水性环氧涂层腐蚀行为 Q235钢

DOI：10.11933/j.issn.1007-9289.2015.02.015

分类号:

基金项目:

Corrosion Resistance of Epoxy Phosphate/Waterborne Epoxy Coatings on Steel

DING Jiheng, LIU Shuan, GU Lin, ZHAO Haichao, YU Haibin^1,2

1a. Key Laboratory of Marine Materials and Related Technologies, 1b. Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, Zhejiang;2. School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094

Abstract:

The preparation of an inhibitor used for waterborne epoxy coating and its corrosion resistance were investigated in this research. Waterborne epoxy phosphate was synthesized by the reaction of bisphenol A epoxy resin and phosphoric acid and then neutralization using N,Ndimethyl ethanolamine. Three different coatings (E44, 0.2% PE44 and 0.5% PE44) were obtained by adding epoxy phosphate into the twocomponent waterborne epoxy resin.The protective performance of epoxy phosphate/waterborne epoxy coatings based on Q235 steel immersed in 3.5% NaCl solution was investigated by polarization curves and electrochemical impedance spectroscopy (EIS). The results show that the corrosion current density of the 0.2% PE44/Q235 carbon steel system (0.431 μA/cm2) is lower than that of the E44/Q235 carbon steel system (0.928 μA/cm2) and 0.5% PE44/Q235 carbon steel system (0.553 μA/cm2) after 24 hours. During the immersion of 24 hours, the coating capacitances Qc of the three coatings gradually increase, and the coating resistances Rc and charge transfer resistances Rct gradually decrease. Epoxy phosphates can significantly improve the corrosion resistance of waterborne epoxy coatings on Q235 steel. The epoxy phosphate content of 0.2% achieves high corrosion protection performance.

Key words: epoxy phosphate waterborne epoxy coating corrosion behavior Q235 steel