Oloyede O R
Afe Babalola Univerity, Nigeria
Title: Improving wear performance of multi-layer electroless Ni-based coating using laser heat treatment
Biography
Biography: Oloyede O R
Abstract
The industrial application of electroless nickel (EN) based plating in automobile, maritime and spacecraft parts manufacturing sector is growing by the day due to its high hardness, uniform thickness deposition as well as its excellent thermal, wear, impact and corrosion resistance. In this study, emphasis is on the formulation and deposition of multilayer duplex Ni-P/Ni-W-P coatings; as well as the observed microstructural and tribology behaviour changes between the as-deposited and laser treated coatings. The coatings were obtained from acidic electroless bath. The supersaturated as-deposited coats were observed to have been strengthened by precipitation of nickel phosphide crystallites as a result of controlled and suitable laser treatment. The morphological transformation was confirmed using optical and SEM while the observed change in mechanical property (increased wear resistance) was evaluated using pin-on-disc test apparatus. The results show the case of laser treated Ni-P/Ni-W-P duplex coatings offering better grain orientation/recrystallization, reduced porosity formation and improved wear resistance than in the asdeposited
coatings.