Corrosion protection of waterborne epoxy coatings containing mussel-inspired adhesive polymers based on polyaspartamide derivatives on carbon steel
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2018年第12期
论文作者：Mingliang Yang Jianhua Wu Daqing Fang Bo Li Yang Yang
文章页码：2464 - 2471
摘 要：A novel mussel-inspired adhesive polymer（PHEA-DOPA） containing the 3,4-dihydroxyphenylalanine（DOPA） functional group based on polyaspartamide derivatives was synthesized. The corrosion protection of the waterborne epoxy coatings containing the adhesive polymers was investigated by electrochemical impedance spectroscopy（EIS）. The results indicated that the PHEA-DOPA could improve the corrosion resistance of the waterborne epoxy coating. The corrosion products were also analyzed by Raman microspectroscopy（RM）, indicating the formation of the insoluble DOPA-Fe complexes on the carbon steel surface. These complexes simultaneously acting as a passivating layer, can inhibit the process of corrosion at the metal-solution interface. The differential scanning calorimeter（DSC） measurement indicated that PHEA-DOPA can increase the crosslinking density of coating. The effect of O2 on the protective mechanism of the PHEA-DOPA coating in a 3.5% NaCl solution was also evaluated by EIS. The results indicated that the barrier effect was significantly improved under aerated conditions because DOPA was oxidized to DOPA-quinone（Dq） by O2, which triggered the reaction with Fe ions that were released from the surface of the carbon steel. This led to more compact coatings.
Mingliang Yang1,2，Jianhua Wu1,3,2，Daqing Fang2，Bo Li2，Yang Yang2
1. College of Materials Science and Chemical Engineering,Harbin Engineering University2. Xiamen Sunrui Ship Coating Co.,LTD.3. State Key Laboratory for Marine Corrosion and Protection
摘 要：A novel mussel-inspired adhesive polymer（PHEA-DOPA） containing the 3,4-dihydroxyphenylalanine（DOPA） functional group based on polyaspartamide derivatives was synthesized. The corrosion protection of the waterborne epoxy coatings containing the adhesive polymers was investigated by electrochemical impedance spectroscopy（EIS）. The results indicated that the PHEA-DOPA could improve the corrosion resistance of the waterborne epoxy coating. The corrosion products were also analyzed by Raman microspectroscopy（RM）, indicating the formation of the insoluble DOPA-Fe complexes on the carbon steel surface. These complexes simultaneously acting as a passivating layer, can inhibit the process of corrosion at the metal-solution interface. The differential scanning calorimeter（DSC） measurement indicated that PHEA-DOPA can increase the crosslinking density of coating. The effect of O2 on the protective mechanism of the PHEA-DOPA coating in a 3.5% NaCl solution was also evaluated by EIS. The results indicated that the barrier effect was significantly improved under aerated conditions because DOPA was oxidized to DOPA-quinone（Dq） by O2, which triggered the reaction with Fe ions that were released from the surface of the carbon steel. This led to more compact coatings.
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