Evaluation of corrosion and erosive wear behaviour of Co-Ni-Fe coating deposited by electrodeposition method

Corrosion and erosive wear are insidious problems in the offshore industry. It could not only contribute to the rise of cost for maintenance and repair but also may lead to hazardous working conditions. The potential reduction may be achieved by the application of appropriate coating to protect the surface. Current study reported fabrication and characterisation of Co-Ni-Fe coatings deposited at various deposition times. The main aims are to investigate the physical and mechanical properties, as well as the corrosion and erosive wear resistance behaviour of the coatings. Co-Ni-Fe coatings were deposited using electrodeposition method with deposition time of 30 to 90 minutes. The as-deposited coatings were characterised using Scanning Electron Microscope (SEM), Vicker Hardness, X-ray Diffraction (XRD) and Alicona Infinite Focus. The corrosive and wear behaviours of coatings were investigated using dip test and slurry test respectively. The findings showed the existence of voids on coatings deposited for 30 minutes. The particle size of Co-Ni-Fe increased as the deposition time was prolonged to 90 minutes with the largest size of 8 to 15 mu m. Results showed that the corrosion and wear resistance behaviour of Co-Ni-Fe coatings improve by 32% and 78% with a prolonged deposition time of 90 minutes.