| JIAO Zhi-qiang,WEI Shi-cheng,HAN Qing,WANG Bo,CHEN Jian-she,LI Bin-chuan.Effect of Nano-titanium Polymer on Microstructure and Corrosion Resistance of Water-based Epoxy Coatings[J],52(9):189-198 |
| Effect of Nano-titanium Polymer on Microstructure and Corrosion Resistance of Water-based Epoxy Coatings |
| Received:June 18, 2022 Revised:February 27, 2023 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2023.09.015 |
| KeyWord:nano-titanium polymer water-based epoxy microstructure corrosion resistance electrochemical testing |
| Author | Institution |
| JIAO Zhi-qiang |
Northeastern University, Shenyang , China |
| WEI Shi-cheng |
National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing , China |
| HAN Qing |
Northeastern University, Shenyang , China |
| WANG Bo |
National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing , China |
| CHEN Jian-she |
Northeastern University, Shenyang , China |
| LI Bin-chuan |
Northeastern University, Shenyang , China |
|
| Hits: |
| Download times: |
| Abstract: |
| To study the effect of different nano-titanium polymer (NTP) contents on the microstructure and corrosion resistance of water-based epoxy resin coatings. In this experiment, NTP was used as fillers to improve the water-based epoxy coatings for the first time by physical blending. Pencil hardness test, cross-cut adhesion test, scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FT-IR), electrochemical test and salt spray test were taken to detect the microscopic morphology, microstructure and anti-corrosion properties of the coatings. The pencil hardness of the coating was improved from HB to 3H by adding NTP and all coating adhesion grades were 0, which indicated good adhesion between the coating and the substrate. SEM test results showed that adding NTP could significantly reduce the agglomeration of epoxy resin latex particles, but agglomeration would occur when NTP was added in excess. Only when the addition amount was 10wt.%, the surface defects of the coating were the least. EIS tests were performed on the coatings. And the results of each group of coatings were fitted with two different models. The penetration process of corrosive medium in the coating was analyzed by fitting the results and the improvement mechanism of NTP on the coating was explained by combining the SEM results:NTP could significantly alleviate the agglomeration of epoxy resin latex particles and could participate in the cross-linking curing reaction of the coating to enhance the denseness of the coating, but it could not be added in excess. When the addition amount of NTP was 10wt.%, the coating was the densest and the capacitive arc radius of the coating in the high frequency band was the largest, and the impedance modulus value in the low frequency band was the largest, which was three times higher than that of the pure water-based coating. The results of Tafel curve showed that the addition of NTP positively shifted the corrosion potential of the coating. When the content of NTP was 10wt.%, the corrosion potential of the coating was the highest, which was ‒1.024 9 V, and the corrosion current density was the smallest, which was 8.09×10‒8 A/cm2. The results of salt spray test showed that the NTP could significantly improve the corrosion resistance of the coating, and the optimum addition amount was consistent with the other test results, which was 10wt.%. To sum up the above, when the content of NTP is 10wt.%, the surface defects of the coating are the least and the coating has the best anti-corrosion performance. |
| Close |
|
|
|