The investigation of Ni/NiO coatings in aluminum substrate has been realized to develop high performance selective surfaces for photothermal applications. These absorber surfaces have been designed for industrial production. The present work describes Ni/NiO coatings in aluminum substrate obtained by chemical and electrolytic processes. Thermal treatments were used for oxidation. The first layer is Ni, the second one is NiO, the layer is an antireflectant (AR). The layer thicknesses are 1.0µm. The microstructures of the samples were examined by scanning electronic microscope (MEV). The X-ray diffraction (XRD) was used to identify the present phases. The optical properties, in some regions of visible and near infrared, allowed peaks of 97,5% for solar absorption and reflection of 12% for the electrolytic process oxidation.
Ni/NiO coatings; chemical; electrolytic processes; solar absorption
