低温固化AMT–GO/EP复合涂层的制备及防腐性能研究

Preparation and Protection Performance of AMT-GO/EP Coating Cured at Low Temperature

目的研究‒10℃下固化的复合涂层在常温和低温环境下的防腐性能。方法通过溶液共混法成功制备了2–氨基–5巯基–1,3,4噻二唑修饰的氧化石墨烯(AMT–GO),并将其作为填料添加到环氧树脂(EP)中,随后在‒10℃环境下进行固化,形成AMT–GO/EP复合涂层。同时,制备纯环氧涂层(纯EP)和氧化石墨烯增强环氧涂层(GO/EP)作为对照。通过盐雾试验、低温–盐雾交替试验、附着力测试和吸水率测试等方法研究了低温固化涂层的防腐性能。结果加入AMT–GO填料的环氧涂层在‒10℃的环境下经过72 h后可良好固化,形成更致密的交联结构,在6 d的中性盐雾试验后仍具备良好的防腐性能。该涂层的吸水率(2.77%)约为纯环氧涂层(5%)的一半,其附着力(5.53 MPa)大于纯环氧涂层的附着力(4.01 MPa)。结论AMT可以有效地改善氧化石墨烯在环氧涂层中的分散性,在环氧涂层中添加一定量的AMT–GO可以提高低温固化涂层的交联密度,有效阻碍了腐蚀介质的渗透过程,提高了涂层的防腐性能。另外,该涂层在低温–盐雾交替试验中仍保持十分优异的防腐性能。

This work aims to improve the corrosion resistance of epoxy resin cured at -10 ℃. Herein, 5-Amino-1,3,4-thiadiazole-2-thiol modified graphene oxide(AMT-GO) were successfully prepared by solution blending method. The same amount of graphene oxide(GO) and AMT-GO fillers were introduced into epoxy resin, which cured at low temperature(-10 ℃). The corrosion protection performance of the coatings cured at low temperature was studied by salt spray test, low temperature-salt spray alternating test, adhesion test and water absorption test. The epoxy coating with the right amount of AMT-GO filler can cure well at -10 ℃ after 72 h, forming a more compact cross-linked structure, and still has good anti-corrosion performance after 6 days of salt spray test. The water absorption of the AMT-GO/EP(2.77%) is about half of that of the pure epoxy coating(5%), and the adhesion of the AMT-GO/EP(5.53 MPa) is higher than that of the pure epoxy coating(4.01 MPa). AMT-GO can effectively prevent the infiltration process of corrosive medium, to improve the anti-corrosion coating performance. Besides, the coating will remain in the low temperature-salt alternating fog test is excellent anticorrosion performance.