Characterization and corrosion resistance of electroless black Ni-P coatings of double black layer on carbon steel
| Autor: | M. L. Mendoza López, I. Zamudio Torres, J. J. Pérez Bueno, A. Sosa Dominguez |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Carbon steel Scanning electron microscope chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences Corrosion Coating Materials Chemistry Composite material Absorption (electromagnetic radiation) Double layer (biology) Metallurgy Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Surfaces Coatings and Films Nickel chemistry engineering 0210 nano-technology Layer (electronics) |
| Zdroj: | Surface and Coatings Technology. 326:192-199 |
| ISSN: | 0257-8972 |
| DOI: | 10.1016/j.surfcoat.2017.07.044 |
| Popis: | In this work, the corrosion evaluation of a double black layer, by an acidic bath of double electroless Ni-P coatings, were conducted. A double black layer and a coarse sandblast finishing were intended for increasing the sunlight absorption and its anchoring. The surface preparation process comprises four stages: A) a Ni-P electroless coating, B) an acidic attack for a black layer formation, C) a second Ni-P electroless coating, and D) an acidic attack for a second black layer. The properties of the coating were investigated by X-ray diffraction, scanning electron microscopy, mechanical profilometry, confocal laser scanning microscopy and low-discharge optical emission spectroscopy. The results of these studies indicate that a double layer Ni-P coating with Rp and corrosion rate values of 1170 Ω cm2 and 0.4 mm/year were obtained, thereby exhibiting an increase in corrosion resistance compared to a one layer Ni-P coating. The GDOES profiles show two Ni-P coatings and two black layers intercalated through small variations of the percentage of nickel and phosphorus, which was associated with the interface between both layers. |
| Databáze: | OpenAIRE |
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