| CUI Gan,ZHANG Chu-chu,BI Zhen-xiao,WANG Bing-ying,LI Zi-li,YANG Feng,LI Shou-qin,LIU Jian-guo.Anti-corrosion Performance of Modified Graphene Oxide-based Epoxy Zinc-rich Coating[J],50(2):310-320 |
| Anti-corrosion Performance of Modified Graphene Oxide-based Epoxy Zinc-rich Coating |
| Received:May 17, 2020 Revised:July 05, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.02.033 |
| KeyWord:graphene oxide modification dispersibility epoxy zinc-rich coating anti-corrosion |
| Author | Institution |
| CUI Gan |
College of Pipeline and Civil Engineering,Qingdao , China;Shandong Key Laboratory of Oil & Gas Storage and Transportation Safety, Qingdao , China |
| ZHANG Chu-chu |
College of Pipeline and Civil Engineering,Qingdao , China;Shandong Key Laboratory of Oil & Gas Storage and Transportation Safety, Qingdao , China |
| BI Zhen-xiao |
College of Pipeline and Civil Engineering,Qingdao , China;Shandong Key Laboratory of Oil & Gas Storage and Transportation Safety, Qingdao , China |
| WANG Bing-ying |
School of Materials Science and Engineering, China University of Petroleum East China, Qingdao , China |
| LI Zi-li |
College of Pipeline and Civil Engineering,Qingdao , China;Shandong Key Laboratory of Oil & Gas Storage and Transportation Safety, Qingdao , China |
| YANG Feng |
Dongxin Oil Production Plant, Shengli Oilfield Company, SINOPEC, Dongying , China |
| LI Shou-qin |
Dongxin Oil Production Plant, Shengli Oilfield Company, SINOPEC, Dongying , China |
| LIU Jian-guo |
College of Pipeline and Civil Engineering,Qingdao , China;Shandong Key Laboratory of Oil & Gas Storage and Transportation Safety, Qingdao , China |
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| Abstract: |
| Aiming to improve the anti-corrosion performance of epoxy zinc-rich coating by adding modified graphene oxide, this paper modifies the graphene oxide (GO) by p-aminobenzenesulfonic acid diazo salt, polyvinylpyrrolidone (PVP) and sulfonated carbon nanotube (SMWCNT), prepares the modified graphene oxide-based epoxy zinc-rich coating, analyzes the structure change and the dispersion effect in the coating of modified GO by X-ray diffraction spectrum, Fourier transform infrared spectrum and scanning electron microscope, and discusses the corrosion behavior of the coating in corrosion environment and tests its corrosion resistance by electrochemical impedance spectroscopy, salt spray test, scanning electron microscope and open-circuit potential for graphene oxide epoxy zinc-rich coating with the best modification effect. The results showed that three kinds of modified GO were successfully prepared, and the dispersion effects were all improved. After SMWCNT modification, the lamellar spacing of GO changed from 0.83 nm to 0.88 nm, the dispersion effect was the best in the coating, and the coating formed was dense without pores. With the addition of modified graphene oxide, the cathodic protection time of zinc-rich epoxy coating was prolonged and the physical shielding effect was enhanced. After 1680 hours of salt spray test, there was no blistering on the surface of the coating. The maximum depth of corrosion pits on metal substrate is reduced from 42.31 μm to 16.09 μm. In the process of immersion in electrolyte solution, the impedance modulus of the coating is higher than that of the pure epoxy zinc-rich coating, and after 72 days, the low-frequency impedance of the coating increases from 103 Ω.cm2 to 104 Ω.cm2, and the corrosion resistance is much stronger than that of the pure epoxy zinc-rich coating. It can be concluded that with the addition of modified graphene oxide, the anti-corrosion performance is improved by 62.4%. |
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