Ni-CeO_(2)黑色防护镀层的光助动电位沉积及光热性能

Photo-Assisted Potentiodynamic Deposition and Photothermal Properties of Ni-CeO_(2)Black Protective Coatings

镍镀层作为一种重要的工程材料,已经在金属涂装等领域得到了广泛的应用,而二氧化铈作为一种重要的稀土氧化物也引起了学者们极大的关注。本工作利用光助动电位沉积法制备了Ni-CeO_(2)复合黑色镀层,分别研究了光照条件、沉积电位范围和沉积温度对镀层结构、组成和性能的影响。采用循环伏安法、塔菲尔极化曲线、接触角测量仪、台阶仪、紫外-可见-近红外分光光度计、发射率测量仪、扫描电子显微镜及附属能谱对不同条件下制备的镀层进行了系列表征。结果表明,光照条件下,沉积电位范围为0~-1.5 V、沉积温度为50℃时制备的Ni-CeO_(2)复合黑色镀层具有最佳的综合性能,其腐蚀电流密度为9.642×10^(-6)A·cm^(-2),水接触角达到125.95°,各波段吸收率均在94%以上且具有0.592的发射率。当沉积电位范围为0~-3.5 V时,镀层具有最高的发射率,达0.757;光照条件除了对CeO_(2)的沉积产生影响之外,也显著提升了Ni的沉积速率。该研究为制备具有高吸收率和发射率的黑色复合镀层提供了一个思路,有望在光热转换和光学仪器中得到应用。

Nickel coatings,as important engineering materials,have been widely used in many industrial fields.Ceria,as an important rare earth oxide,has also attracted great attention of scholars.In this work,Ni-CeO_(2)composite black coatings were prepared by photo-assisted potentiodynamic deposition.The effects of light,deposition potential range and temperature on the structure,composition and properties of the coatings were studied.The coatings prepared under different conditions were characterized by cyclic voltammetry,Tafel polarization curves,contact angle measurement,stylus profiler,ultraviolet-visible-near-infrared spectrophotometer,dual-band emittance measuring instrument,scanning electron microscopy and energy dispersive spectrometry.The results show that the Ni-CeO_(2)composite black coating prepared at the deposition potential range of 0—-1.5 V,the temperature of 50℃and with the photo illumination has the best comprehensive properties:the corrosion current density of 9.642×10^(-6)A·cm-^(2),water contact angle of 125.95°,the absorptivity above 94%and the emissivity of 0.592.When the deposition potential range is 0—-3.5 V,the coating has the highest emissivity of 0.757.Photo illumination not only affects the deposition rate of CeO_(2),but also significantly increases the deposition rate of Ni.This study provides an idea to prepare black composite coatings with high absorptivity and emissivity,which can be expected to be applied in photothermal conversion and optical instruments.