缓蚀型聚邻甲苯胺-氧化石墨烯基防腐材料的制备与性能
Preparation and properties of corrosion inhibited poly(o-toluidine)-graphene oxide-based anticorrosive materials
王海花 1叶梦玉 1费贵强 1李焱宇 1王丹丹1
作者信息
- 1. 陕西科技大学 化学与化工学院,西安 710021
- 折叠
摘要
为开发缓蚀剂高效利用的新途径,选取氧化石墨烯为基材、聚邻甲苯胺微胶囊为壁材、缓蚀剂 2-巯基苯并噻唑为芯材,制备了缓蚀型聚邻甲苯胺-氧化石墨烯基防腐材料,并将其作为填料用于水性环氧树脂涂层(WEP)的改性.通过FTIR、XRD、XPS和SEM等对材料进行了结构和形貌的表征,采用紫外可见光谱对缓蚀剂的释放行为进行分析,采用万能试验机、电化学测试和盐雾实验对涂层的拉伸性能和防腐性能进行了评价.结果表明:缓蚀剂成功包覆于聚邻甲苯胺微胶囊内部,并通过共价键方式将微胶囊连接在改性氧化石墨烯表面,使缓蚀剂得到了充分利用,提高了涂层的拉伸性能、自修复性能及对腐蚀介质的屏蔽性能.紫外可见光谱测试结果表明,微胶囊在人工破损96 h后,内部缓蚀剂的释放量达78%;拉伸性能测试结果表明,与纯WEP相比,当填料加入量为 0.3wt%时,涂层应力从 14.281 MPa增加到 24.25 MPa;SEM结果表明,被划伤的涂层在常温下放置 10 h后自修复;电化学测试和盐雾实验结果表明,涂层腐蚀电位从-0.6216 V提高到-0.1554 V,腐蚀电流密度从4.271×10-7 A·cm-2 减小到1.016×10-11 A·cm-2,阻抗模量可达到1.5757×109 Ω·cm2,在盐雾 500 h后仍表现出较好的防腐性能.
Abstract
In order to develop a new way of efficient utilization of corrosion inhibitors,a corrosion inhibited poly(o-toluidine)-graphene oxide-based anticorrosive materials was prepared by using graphene oxide as the substrate,poly(o-toluidine)microcapsules as the wall material and 2-mercaptobenzothiazole as the corrosion inhibitor as the core material,and it was used as the filler for the modification of waterborne epoxy resin coating(WEP).The struc-ture and morphology of the coating were characterized by FTIR,XRD,XPS and SEM.The release behavior of the cor-rosion inhibitor was analyzed by UV-Vis spectroscopy.The tensile property and anti-corrosion properties of the coating were evaluated by universal testing machine,electrochemical test and salt spray test.The results show that the corrosion inhibitor is successfully coated inside poly(o-toluidine)microcapsules,and the microcapsules are connected to the surface of the modified graphene oxide by covalent bond,so that the corrosion inhibitor is fully utilized,and the tensile property,self-healing properties and shielding properties of the coating against corrosive media are improved.UV-vis spectrum test results show that the release of corrosion inhibitor in microcapsules reaches 78%after 96 h of artificial damage.The tensile property test results show that,compared with pure WEP,the coating stress increases from 14.281 MPa to 24.25 MPa when the filler content is 0.3wt%.SEM results show that the scratched coating self-healing after 10 h at room temperature.The electrochemical test and salt spray test results show that the corrosion potential of the coating increases from-0.6216 V to-0.1554 V,the corrosion current density decreases from 4.271×10-7 A·cm-2 to 1.016×10-11 A·cm-2,and the impedance modulus can reach 1.5757×109 Ω·cm2.After 500 h of salt spray,the corrosion resistance is still good.
关键词
氧化石墨烯/聚邻甲苯胺/微胶囊/水性环氧树脂/防腐涂层Key words
graphene oxide/poly(o-toluidine)/microcapsule/water-based epoxy resin/anticorrosive coating引用本文复制引用
基金项目
国家自然科学基金面上项目(21978164)
国家自然科学基金面上项目(22078189)
出版年
2024
NETL
NSTL
万方数据