AZ31B Mg alloy substrate was coated in aqueous sodium aluminate, sodium silicate and KOH electrolyte using PEO method in different processing times with and without WC nano-powders. Thickness, composition, morphology and hardness examined using eddy current, EDS, SEM and micro-Vickers hardness tester respectively. Electrochemical corrosion tests were carried out using potentiodynamic polarization technique. Pin on disk wear test was implemented in order to investigate effect of added WC nano-powders in nano-composite ceramic coating on AZ31B alloy. In cross section investigation, increase in thickness with coating time and in coating surfaces increase in porosity percentage and mean pore diameter with coating time was revealed. In presence of nanopowders wear rate, wear track width was decreased and roughness and COF increased. Results showed that presence of nano-powders can modify the composition of coating and subsequently corrosion resistance of coated samples. Also Hardness of nanocomposite coating is about 1.62 times greater than that of ordinary coatings.
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Vatan et al. (2016) studied this question.
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