| LU Zhong-hai,ZHANG Lun-wu,LI Chuan-peng,YU Jin-guang,LIU Jie.Effect of Different Temperatures on Shape Memory Effect and Protective Performance of Epoxy Coating[J],50(1):357-365 |
| Effect of Different Temperatures on Shape Memory Effect and Protective Performance of Epoxy Coating |
| Received:March 04, 2020 Revised:May 19, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.01.032 |
| KeyWord:epoxy coating shape memory effect temperatures self-healing EIS |
| Author | Institution |
| LU Zhong-hai |
School of Chemistry and Chemical Engineering, Yantai University, Yantai , China |
| ZHANG Lun-wu |
Weathering Test and Research Center of Science Technology and Industry for National Defense, Southwest Technology and Engineering Research Institute, Chongqing , China |
| LI Chuan-peng |
School of Chemistry and Chemical Engineering, Yantai University, Yantai , China |
| YU Jin-guang |
School of Chemistry and Chemical Engineering, Yantai University, Yantai , China |
| LIU Jie |
School of Chemistry and Chemical Engineering, Yantai University, Yantai , China |
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| Abstract: |
| The work aims to study the effect of different temperatures on the shape memory effect and protective performance of epoxy coating. Self-healing anticorrosive coating was prepared by mixing equimolar bisphenol A diglycidyl ether, neopentyl glycol diglycidyl ether and D230 curing agent. The chemical structure and mechanical properties of the epoxy coating were characterized by Fourier infrared transform spectroscopy (FTIR) and adhesion tester. The shape recovery rate of the epoxy coating at different temperatures was measured to characterize its shape memory performance. Electrochemical impedance spectroscopy (EIS) technique was used to characterize the electrochemical performance of the epoxy coating, and micro-morphological evolutions of scratched coating were recorded by an electronic digital microscope. The main characteristic peaks and relative intensity of the anti-corrosion coating with self-healing function at different temperatures in the infrared spectrum were basically the same as those of the unheated epoxy coating, and the adhesion strength of the epoxy coating at different temperatures all exceeded 13 MPa. As the heating temperatures increased, the recovery rate of the epoxy coating first increased rapidly and then increased slowly. Meanwhile, the impedance modulus first increased and then decreased, and the scratch width first decreased and then basically did not change. The impedance value of the epoxy coating after heating at 70 ℃ was always significantly higher than that of the unheated epoxy coating in the same immersion time. Within a certain temperature range, the self-healing anticorrosive coating has no degradation reaction, and it has excellent adhesion performance. Increasing temperature enhances the movement trend of molecular chains, and improves the self-healing performance of the epoxy coating. When the heating temperature is very high, the self-healing performance of the coating is not further enhanced. Therefore, the optimal response temperature for obtaining the shape memory effect of the epoxy coating is 70 ℃. Triggering the shape memory effect of the epoxy coating after it is heated to 70 ℃ can significantly narrow the width of the scratches and greatly improve the protective performance of the scratched coating. |
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