Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Electrochemical corrosion resistance of martensitic stainless steel coatings on carbon steel substrates obtained by thermal spraying and friction surfacing
Submission Author:
Gabriela de Andrade Oliveira , MG , Brazil
Co-Authors:
Gabriela de Andrade Oliveira, Carlos Roberto de Araújo, Fernanda Christina Teotonio Dias Troysi, Pedro Paiva Brito
Presenter: Gabriela de Andrade Oliveira
doi://10.26678/ABCM.COBEM2021.COB2021-1017
Abstract
Friction surfacing is a solid-state joining process that has been successfully applied for producing similar and dissimilar coatings of numerous metallic alloys, avoiding some of the problems associated with conventional fusion based welding techniques such as solidification cracking, formation of gas porosities and elevated residual stresses. In the present work, a comparison of the electrochemical corrosion resistance of AISI 420 martensitic stainless steel coatings deposited on AISI 1045 carbon steel steel substrates by thermal spraying and friction surfacing is compared. The corrosion resistance was investigated by potentiodynamic polarization in 0.5M H2SO4 solution containing naturally dissolved O2. The coatings were further analyzed in terms of mechanical properties (Vickers microhardness profiles determined along the materials cross sections) and microstructure. Both coatings exhibited similar hardness profiles, but was possible to show that the coatings obtained by thermal spraying exhibited a relatively high level of porosities, which hindered its corrosion resistance compared to the coatings obtained by friction surfacing.
Keywords
Friction Surfacing, Coatings, corrosion, thermal spray
