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Incorporation of Reactive Corrosion Inhibitor in Waterborne Acrylic Polyurethane Coatings and Evaluation of its Corrosion Performance
Lin Gu1, Ji-heng Ding1,2, Shuan Liu1, Hai-bin Yu1
1.Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Ma-rine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;2.School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Abstract:
Hydroxyl-epoxy phosphate (HEP) as a reactive corrosion inhibitor was innovatively synthesized by the reaction of bisphenol A epoxy resin with phosphoric acid. HEP was mixed with hydroxyl acrylate resin, and crosslinked with waterborne isocyanate curing agent, which was used to form waterborne HEP/acrylic polyurethane composite (HEP-APU) coatings on Q235 steel surfaces. Electrochemical impedance spectroscopy and polarization curves were applied to analyze the corrosion behavior of the HEP-APU coatings in 3.5wt% NaCl solutions. The results indicated that the HEP-APU coatings show a superior passivation property and efficient corrosion protection of Q235 steel. The waterborne acrylic polyurethane coating containing 0.5wt% HEP exhibited the best corrosion performance among all the coating specimens. The improved flash-rust resistance can be attributed to the introduction of the phosphate group which could form phosphate film on the steel substrate.
Key words:  Hydroxyl-epoxy phosphate  Acrylic polyurethane  Electrochemical impedance spectroscopy  Corrosion performance  Passivation
FundProject:This work is supported by the National Natural Science Foundation of China (No.21404112), the China Postdoctoral Science Foundation (No.2014M561798) and the Ningbo Natural Science Foundation (No.2015A610016). We thank Dr. Qing-yun Wu from Ningbo University for the suggestion and discussion.
水性丙烯酸聚氨酯涂料中反应性缓蚀剂掺入及其耐蚀性能
顾林1, 丁纪恒1,2, 刘栓1, 余海斌1
1.中国科学院海洋新材料与应用技术重点实验室, 浙江省海洋材料与防护技术重点实验室, 中国科学院宁波材料技术与工程研究所, 宁波 315201;2.南京理工大学化工学院, 南京 210094
摘要:
利用磷酸和双酚A环氧树脂反应得到功能性缓蚀剂羟基环氧磷酸酯(HEP). 将其添加到水性羟基丙烯酸树脂中,再与水性异氰酸酯固化剂交联,制备了水性羟基环氧磷酸酯/丙烯酸聚氨酯复合涂层(HEP-APU). 由于磷酸酯基团可以与金属基体发生反应,在金属表面形成一层磷化膜,极大的提升了金属的抗闪蚀能力. 利用电化学阻抗谱和极化曲线研究HEP-APU复合涂层对Q235碳钢在3.5wt% NaCl溶液中耐蚀性能. 结果表明,HEP-APU涂料对Q235碳钢具有优越的钝化和耐腐性能,且当HEP在水性丙烯酸聚氨酯涂料中质量分数为0.5%时,所得到的复合涂层的防腐性能最佳.
关键词:  羟基环氧磷酸酯  丙烯酸聚氨酯  EIS  耐蚀性能  钝化
DOI:10.1063/1674-0068/29/cjcp1507156
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