Abstract

AKANDE, G. et al. Development of Ni-Al₂SiO₅/Ni-SiO₂ Coating Doped with Benzotriazole: Corrosion, Structural Evolution and Thermal Degradation Study. Port. Electrochim. Acta [online]. 2022, vol.40, n.6, pp.451-462.  Epub Dec 31, 2022. ISSN 0872-1904.  https://doi.org/10.4152/pea.2022400605.

Several engineering mild steel components have catastrophically failed, due to structural defects, corrosion and wear deformation. These drawbacks have prompted a continuous mild steel modification, for its higher durability and efficiency. In an attempt to improve the metal performance, Ni-SiO2 (silicon dioxide), Ni-SiO2-C6H5N3 (1H-benzotriazole), Ni-Al2SiO5 (niquel + aluminum silicate) and Ni-Al2SiO5-10C6H5N3 composite films were developed on mild steel samples, at a constant temperature of 45 ºC, and deposition time of 20 min. The coating performances were investigated by potentiodynamic polarization technique, CERT UMT-2 multi-functional tribological testing, high resolution optical microscopy and high diamond pyramid indentation. The samples were further subjected to heat treatment, and its effects on hardness were examined. Potentiodynamic polarization study carried out in 0.5 M HCl revealed an improved anti-corrosion resistance. The hardness and wear tests showed better mild steel mechanical properties. Ni- Al2SiO5-10C6H5N3 coated sample had better hardness and wear resistance features that those from the other samples. High resolution optical microscopy unveiled the particles homogeneous distribution throughout mild steel, with a new surface evolution. Mild steel surface morphology and other properties was optimized by Ni-SiO2, Ni-SiO2-C6H5N3, Ni-Al2SiO5 and Ni-Al2SiO5-10C6H5N3 coatings. Comparatively, NiAl2SiO5- C6H5N3 coated mild steel exhibited the overall best performance characteristics, and it is thus recommended for advanced applications in petrochemical and marine industries.

Keywords : wear; corrosion; mild steel; hardness and polarization.

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