| QIN Wen-feng,LI Ya-yun,GENG Jun-heng,LIN Chuan-xi.Preparation and Corrosion Resistance of Epoxy Resin Coating Modified by MMT-PPy[J],51(3):128-137 |
| Preparation and Corrosion Resistance of Epoxy Resin Coating Modified by MMT-PPy |
| Received:June 15, 2021 Revised:August 25, 2021 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.03.013 |
| KeyWord:anti-corrosion coating montmorillonite polypyrrole EIS |
| Author | Institution |
| QIN Wen-feng |
Aviation Engineering College, Civil Aviation Flight University of China, Guanghan , China |
| LI Ya-yun |
Aviation Engineering College, Civil Aviation Flight University of China, Guanghan , China |
| GENG Jun-heng |
Aviation Engineering College, Civil Aviation Flight University of China, Guanghan , China |
| LIN Chuan-xi |
Aviation Engineering College, Civil Aviation Flight University of China, Guanghan , China |
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| Abstract: |
| This paper aims to study the anti-corrosion performance of montmorillonite-polypyrrole (MMT-PPy) modified epoxy resin coating. PPy is prepared by oxidation synthesis method, MMT-PPy powder with different Py content is prepared by intercalation method, EP, PPy/EP, MMT/EP, MMT-PPy/EP coating samples are prepared by knife coating method, and samples prepared with different Py content MMT-PPy composite coating and doped MMT-PPy composite coating with different mass fractions, using SEM, FT-IR, XRD, 3D profile scanner, contact angle measuring instrument, electrochemical workstation to observe and analyze the micro morphology of the coating, structural components, hydrophobic properties, corrosion resistance, etc. The results show that the distance between the MMT layers became significantly larger, and there are cellular PPy particles between the layers, and the morphology is more dense, indicating that the PPy is successfully intercalated into the MMT, which can make the MMT-PPy coating more continuous; the left shift of the characteristic peak in the FT-IR test indicates that the polymerization between PPy and MMT occurs; from XRD, it is found that PPy is successfully intercalated to the interlayer of MMT, and the interlayer spacing of MMT is expanded from 1.241 nm to 1.838 nm; through the contact angle and roughness test, the contact angle CA of the MMT-PPy/EP coating is 84.3°, and the hydrophobic performance is better; in the electrochemical polarization curve analysis, the corrosion potential of the MMT-PPy/EP coating is the largest, which is ‒0.661 V, the minimum corrosion current is 1.801×10‒8 A/cm2, and the protection rate reaches 99.28%, indicating the lowest corrosion rate; electrochemical impedance spectroscopy analysis shows that MMT-PPy/EP coating is better than other coatings. It has a larger impedance arc, the phase angle is the largest in the high-frequency region, and the impedance modulus value is the largest in the low-frequency region, indicating that its corrosion resistance is better. In the influence of changing the Py content on the corrosion resistance of the MMT-PPy powder made, the impedance arc of m(Py)∶m(MMT)=3∶1 is the largest, and the MMT-PPy powder prepared by doping 5wt.% m(Py)∶m(MMT)=3∶1 is added to Among epoxy resins, the coating has the largest arc resistance and the best corrosion resistance. According to the above results, when the addition amount of MMT-PPy composite is 5wt.% and the ratio of m(Py)∶m(MMT) is 3∶1, the anticorrosion effect of composite epoxy resin coating is the best. |
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