Electrolytic Deposition of Ni/NiO on Stainless Steel for Production of Selective Surfaces

Abstract The solar energy is one of the most promising energy sources today. In this context, the goal of this work is to produce selective surfaces for receiver tubes of parabolic trough collectors (PTCs). Ideally, solar collectors should have an absorbing surface that has high absorptance for radiation in the solar energy spectrum and, at the same time, low emittance. Therefore, Ni/NiO selective surfaces were produced with Ni in the first film and NiO in the second film. The method used was by electrolytic deposition of nickel on stainless steel AISI 304, followed by oxidation in a muffle furnace. The thicknesses of the coatings were measured with the photometer Digimess, making it possible to verify their variations and the surface irregularities typical of the electrodeposition procedure. The NiO film was observed in scanning electron microscope (SEM). The film hardness was evaluated by the pencil hardness test and the adhesion by the tape test.

摘要 太阳能是当今最具潜力的能源之一。在此背景下，本研究旨在制备槽式太阳能集热器（PTCs）集热管所用的选择性吸收表面。理想的太阳能集热器应具备对太阳能光谱辐射具有高吸收率、同时发射率极低的吸收表面。为此，本研究制备了镍/氧化镍（Ni/NiO）选择性吸收表面，底层为镍膜，表层为氧化镍膜。制备方法为：先在AISI 304不锈钢基底上电解沉积镍，随后在马弗炉中进行氧化处理。采用Digimess型光度计测量涂层厚度，以此验证涂层厚度的变化以及电沉积工艺典型的表面不平整性。通过扫描电子显微镜（SEM）观测了氧化镍膜的微观形貌。采用铅笔硬度试验评估膜层硬度，通过胶带试验测试膜层附着力。