稳定超疏水镍基涂层的制备及其耐蚀性  

Preparation and Corrosion Resistance of Robust Superhydrophobic Nickel-based Coating

作　　者：宋政伟 黄志凤 谢治辉[2] 丁莉峰[1] 张胜健 徐克瑾 张学元 SONG Zheng-wei;HUANG Zhi-feng;XIE Zhi-hui;DING Li-feng;ZHANG Sheng-jian;XU Ke-jin;ZHANG Xue-yuan(Taiyuan Institute of Technology,Taiyuan 030008,China;Sichuan Provincial Key Laboratory of Chemical Synthesis and Pollution Control,China West Normal University,Sichuan Nanchong 637002,China;Gamry Instruments,Warminster Pennsylvania 18974,USA)

机构地区：[1]太原工业学院,太原030008 [2]西华师范大学化学合成与污染控制四川省重点实验室,四川南充637002 [3]GAMRY公司,美国宾夕法尼亚州18974

出　　处：《表面技术》2023年第12期379-389,共11页Surface Technology

基　　金：国家自然科学基金(52271073);山西省大学生创新创业训练项目(2022)。

摘　　要：目的在金属表面制备稳定的超疏水镍基涂层,以提升金属的耐蚀性。方法通过电沉积方法先后在金属表面获得具有微纳结构的多孔镀镍层和聚硅氧烷层。通过扫描电子显微镜、X射线粉末衍射仪、X射线光电子能谱、傅里叶变换红外光谱仪、接触角测定仪、电化学工作站等对涂层的形貌、成分、疏水性和耐蚀性进行表征。结果乙二醇的添加能够促进电镀镍时阴极氢气的析出,当乙二醇的添加量为50.0~100.0 mg/dm3时,形成了均匀相互连接的多孔镍镀层;在水解后的硅氧烷溶液中、-1.5 V电压下沉积3.0 min,可形成具有自清洁性能的超疏水膜层,其表面水接触角达到(159±1)°。在质量分数为3.5%的氯化钠溶液中,涂层的腐蚀电流密度约为3.6×10^(-8)A/cm^(2),与未修饰的镍镀层相比降低了3个数量级;低频阻抗模值|Z|0.01 Hz为2.0×10^(6)Ω·cm^(2),与未修饰的镍镀层相比,提升了3个数量级;在磨损实验后,涂层的微纳米结构依旧存在,保持着超疏水能力,其腐蚀电流密度和|Z|0.01 Hz分别为5.3×10^(-8)A/cm^(2)和1.3×10^(6)Ω·cm^(2),说明经磨损后涂层依然具有较好的耐蚀性。结论通过电沉积和硅氧烷修饰制备的超疏水复合涂层具有稳定超疏水性和优良耐蚀性,能够为基底金属提供良好的防护。In nature,the corrosion of most metals is universal and spontaneous,so adequate protection must be carried out for metals in use.The coating is one of the most common ways to metal corrosion,such as metal coating,conversion coating,oxidation coating and superhydrophobic coating.Among these protective coatings,the corrosion metal superhydrophobic coating has great application potential in metal protection.The formation of a layer of air as a barrier between asuperhydrophobic metal substrate and liquid provides remarkable opportunities in corrosion resistance of metal compounds.However,the poor stability of the superhydrophobic coating limits its wide range of applications.This paper aims to prepare robust superhydrophobic nickel-based coatings on a metal surface to improve corrosion resistance.The brass sheet was cut into a rectangle of 20 mm´20 mm as the substrate.A composite coating including a micro/nanostructured porous nickel-plated layer and a polysiloxane layer was prepared on the brass surface via a three-step deposition protocol.In the first stage,the nickel-plated layer with a microporous structure was formed on the brass surface by electroplating in a nickel-plating bath with the addition of ammonium chloride and ethylene glycol.After that,the sample was electrodeposited in another nickel-plating solution containing crystal regulator ethylenediamine hydrochloride to form a sea urchin-like nickel layer.Finally,a polysiloxane layer was deposited on the surface by electrodeposition to obtain a coating with durable superhydrophobic properties.The morphology,composition,hydrophobicity,and corrosion resistance of the coating were characterized with a scanning electron microscope(SEM),an X-ray powder diffractometer(XRD),an X-ray photoelectron spectroscopy(XPS),a Fourier transform infrared spectroscopy(FT-IR),a contact angle tester,and an electrochemical workstation.The mechanical stability of the prepared superhydrophobic coating was characterized by a linear wear test on an 800-grit sandpaper with a 200.0 g

关 键 词：电镀镍 超疏水涂层 耐蚀性 多孔镍 微纳米结构 

分 类 号：TG174.4[金属学及工艺—金属表面处理]