石墨烯/氟碳涂层的制备及其耐蚀性能  

Preparation and Corrosion Resistance of Graphene/Fluorocarbon Coating

作　　者：房亚楠[1,2] 刘栓 赵文杰 白琴[1] 刘志雄 赵海超 

机构地区：[1]上海大学材料科学与工程学院,上海200000 [2]中科院海洋新材料与应用技术重点实验室浙江省海洋材料与防护技术重点实验室中科院宁波材料技术与工程研究所,浙江宁波315201

出　　处：《表面技术》2016年第11期67-75,共9页Surface Technology

基　　金：国家自然科学基金(51202263;51335010);"973"计划项目(2014CB643305);宁波市石墨烯重大科技专项(2013B6013);中国博士后基金(2015M580528)~~

摘　　要：目的为了增强氟碳涂层的耐蚀性,研究涂层在3.5%NaCl溶液中的失效过程。方法采用硅烷偶联剂对石墨烯进行接枝改性,将改性后的石墨烯添加到氟碳树脂中,制成不同含量的石墨烯氟碳复合涂层。采用傅里叶变换红外光谱、拉曼光谱、透射电镜和扫描电镜,分析了石墨烯改性前后的结构及在涂层中的分散性。采用交流阻抗谱和动电位极化曲线,研究了涂层在模拟海水中的电化学腐蚀行为和失效过程,并考察了涂层的耐盐雾性能。结果石墨烯表面成功接枝官能团,在涂层中分散较均匀。石墨烯对腐蚀介质具有良好的屏障作用。涂层的防护性能随着石墨烯含量的增大先增加后降低,当含量为0.4%(质量分数)时,涂层的腐蚀电流密度为2.209×10^(–10) A/cm^2,氟碳涂层的腐蚀电流密度为6.026×10^(–6) A/cm^2,腐蚀电流密度大大降低,该涂层的耐蚀性能最好,且浸泡360 h内均为浸泡前期,能有效隔绝腐蚀液体的渗透,对Q235钢基底的防护性能最佳。石墨烯含量过高时易团聚,容易引起缺陷,降低涂层的防护作用。结论石墨烯显著提高了氟碳涂层的耐蚀性能。The work aims to enhance the corrosion resistance of fluorocarbon coating by studying its failure process in 3.5% Na Cl solution. Functionalized graphene obtained by using silane coupling agent for graft modification was added to fluorocarbon resin to fabricate a series of fluorocarbon coatings reinforced with various content of graphene. Structural properties anddispersibility of graphene in the coatings before and after being modified were characterized by Fourier transform infrared spectroscopy（FTIR）, Raman spectroscopy, transmission electron microscopy（TEM） and scanning electron microscopy（SEM）. Moreover, the electrochemical corrosion behavior and failure process of the coatings in simulated seawater（3.5% Na Cl solution） were investigated by virtue of AC impedance spectroscopy and potentiodynamic polarization curve. In addition, salt fog resistance of the coatings was studied as well. The results showed that the graphene surface could be grafted to functional groups successfully and was well dispersed in the coating. The graphene could be well protected from aggressive mediums. Anti-corrosion performance of the coatings first increased and then decreased as the graphene content increased. Provided with graphene coating of 0.4%（mass fraction）, corrosion current density of the coatings 2.209×10–10 A/cm2 and that of fluorocarbon coating 6.026×10–6 A/cm2, significant reduction of corrosion current density contributed to optimal corrosion resistance. Finally, during the 360 h of immersion which fell into early immersion stage, the FEVE-0.4%G coating showed an effective corrosion resistance and could protect Q235 steel substrate in the best manner. The corrosion resistance of fluorocarbon coating can be improved greatly by graphene.

关 键 词：氟碳树脂 石墨烯 分散性 改性 腐蚀行为 电化学 

分 类 号：TG174.2[金属学及工艺—金属表面处理]