Refined Microstructural Formation and Corrosion Behavior of Aluminium Nanocrystalline on Nickel-Phosphate Coatings Produced from Electrolytic Time Dependent Factor

Marine industries and environments is faced with corrosion and wear of materials challenge which have shortened the life span of metals and alloys. In order to curb these problems, nanocrystalline coatings of less than 100 nm size range grain refinement have shown better superior properties as substitute for coating mild steel in marine environment. The study aim at using nanocrystalline coatings for structural and corrosion mitigation of mild steel for manufacturing system. The impact of the particle loading in electrolytic bath is fabricated using electrodeposition technique. The coating characteristics were characterized by scanning electron microscope (SEM) equipped with energy dispersive spectrometer (EDS). The microhardness properties and corrosion behaviour was examined through Dura scan diamond-base Vickers hardness tester and Potentiostat Galvanostat (PGStat101) respectively. From the experimental results, the developed coating Ni–Zn–P–30Al2O3 possesses outstanding properties compared to other emerged alloys. The minimum abrasive wear behaviour and maximum hardness property was observed to be 0.022 and 260 HVN respectively with microhardness tester and CERT UMT-2 reciprocating sliding. The potentiodynamic polarization and SEM studies indicated the impact of different loading of Al2O3 as a suitable additive as protective layer over mild steel. This produced coating has better resistance properties to deterioration and can be considered as potential replacement to other nanocrystalline coating towards mild steel protection in manufacturing environment.