文献类型：期刊文献

英文题名：Polybenzoxazine/Epoxy Composite Coatings: Effect of Crosslinking on Corrosion Resistance

作者：Zhou, Changlu[1];Fu, Ming[1];Xie, Hanyu[1];Gong, Yanwei[1];Chen, Jiawen[1];Liu, Juan[2];Xin, Zhong[3]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Res Ctr Anal & Test, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2021

卷号：60

期号：4

起止页码：1675

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20210609884774);WOS:【SCI-EXPANDED(收录号:WOS:000618164700016)】；

基金：National Natural Science Foundation of China (21978086), Shanghai Pujiang Program (2020PJD015), Innovation Program of Shanghai Municipal Education Commission (2019-01-07-00-02-E00061), the Fundamental Research Funds for the Central Universities (50321011921025).

语种：英文

外文关键词：Hydrogen bonds - Sodium chloride - Corrosion resistant coatings - Curve fitting - Fourier transform infrared spectroscopy - Charge transfer - Solutions - Composite coatings - Hydrogen - Electrochemical corrosion - Electrochemical impedance spectroscopy

摘要：The crosslinking structure of polybenzoxazine/epoxy (PBE) composite coatings was controlled by a polymerization reaction between a benzoxazine (Bz) precursor bearing 1-3 Bz rings and epoxy. The structure was confirmed by Fourier-transform infrared spectroscopy (FTIR). Electrochemical impedance spectroscopy was used to monitor the corrosion resistance of the PBE coating. A good barrier coating with a high crosslinking density was obtained by incorporating a Bz precursor with 2 or 3 Bz rings, which showed a much higher gel content of similar to 99% than the system (gel content: similar to 66%) derived from a Bz precursor with only one Bz ring. Additionally, an increased charge-transfer resistance of approximately 1-3 orders of magnitude greater than that of the other system was observed during the immersion process. The influence of hydrogen bonding was also investigated in this paper by curve-fitting of the corresponding FTIR spectra, which is another important factor that determines the coating's resistance to corrosion. As a result, the coating with high crosslinking density and less intermolecular hydrogen bonding content exhibited the best performance with a high charge-transfer resistance of over 1 G Omega cm(2) and a low double-layer capacitance of similar to 7 nF cm(-2) during 80 days' immersion in a 3.5 wt % NaCl aqueous solution.