Investigation on microstructural, anti-corrosion and mechanical properties of doped Zn–Al–SnO2 metal matrix composite coating on mild steel

摘要

In this study, the microstructural, mechanical and anti-corrosion properties of nanocomposite Zn–Aludcoating containing SnO2 nanoparticles prepared from sulphates electrolyte by electrodeposition on mildudsteel substrate was investigated. The morphologies of the coating were analysed using SEM/EDS, AFMudRaman and X-ray diffraction. The anticorrosion behaviour of the coating prepared with different concentrationsudof SnO2 (7 and 13 g/L) and potential of (0.3 and 0.5 V) was examined in 3.65% NaCl solution byudusing linear polarization techniques. The wear and hardness properties of the coatings were performedudunder accelerated reciprocating dry sliding wear tests and diamond micro-hardness tester respectively.udThe results obtained showed that the incorporation of SnO2 in the plating bath brings an increase in corrosionudresistance and mechanical properties of Zn–Al–SnO2 composite coatings. The SEM images showeduda homogeneous grain structure and finer morphology of the coatings. The hardness values was found toudimprove with the amount of the SnO2 embedded into the Zn–Al metal deposit and effective depositionudparameters