多巴胺表面改性CNTs制备微纳双重结构的Ni/CNTs@pDA超疏水复合镀层

Preparation of Super-hydrophobic Ni/CNTs@pDA Composite Coating with Micro/Nano Binary Structures by Dopamine Modification

为进一步增强Ni/CNTs复合镀层的耐腐蚀性、耐摩擦以及耐磨损性,采用多巴胺(DA)对碳纳米管(CNTs)进行表面改性处理,增强CNTs的亲水性以及与镀层金属间的结合力。高分辨透射电镜(HRTEM)和能谱仪(XPS)检测表明,处理后的CNTs被聚多巴胺(pDA)膜包裹,膜厚最高达3.6 nm。其后本研究使用球盘式摩擦磨损实验机和电化学工作站对复合镀层的摩擦学性能和腐蚀性能进行了测试。结果表明:Ni/CNTs@pDA复合镀层的性能优于纯镍镀层。最后本研究使用氟硅烷(FAS)对镀层表面进行改性,从而构建超疏水表面,接触角测试仪分析表明静态接触角最高可达152.7°。

In order to enhance the corrosion resistance,rub resistance and wear resistance of Ni/CNTs composite coating,surface modification of carbon nanotubes(CNTs)was carried out by dopamine(DA),and the hydrophilicity of CNTs and the bonding between CNTs and the substrate was improved obviously.The high resolution transmission electronic microscope(HRTEM)and energy dispersive spectrometer(XPS)confirmed that the CNTs were coated with poly-dopamine(pDA)up to 3.6 nm.Then the tribological properties and corrosion behavior of the composite coating were measured by ball-on-disk wear tester and electrochemical workstation.The results showed that the performance of Ni/CNTs@pDA compo-site coating is better than the pure nickel coating.Finally,tridecafluorooctyl trimethoxysilane(FAS)was selected to modify the composite coating surface to improve their hydrophobicity.The maximum contact angle measuring up to 152.7°.