Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Electrodeposition of CuZn from alkaline solution containing micrometric SiC particles in a flow-cell for composite coatings.
Submission Author:
Paulo Cezar Tulio , PR
Co-Authors:
Paulo Cezar Tulio, Maria Isabel da Silva
Presenter: Paulo Cezar Tulio
doi://10.26678/ABCM.COBEM2021.COB2021-1578
Abstract
Metal-matrix composites (MMCs) coatings can be obtained by electrodeposition. Hard particles as dispersed phase can enhance erosion-corrosion resistance by acting as obstacles for dislocations. Indirect effects of particles on the metal matrix, such as reduction in grain size and, in the case of alloys, increase of the tougher metal in the matrix also contribute for enhancing. In this work it was studied the electrodeposition of CuZn metal matrix from an alkaline solution containing SiC hard particles at CSiC of 10 g/L. A flow-cell was employed. CuZn coatings were obtained at distinct deposition current densities (ig): 15, 20, 30 and 40 mA/cm2. Fluid velocity was 0.43 m/s. Coatings were characterized by SEM, EDS and Microindentation hardness. Formation of CuZn-SiC coating was indicated by EDS. Mass ratios (% m.Cu/% m.Zn) were influenced by the presence of SiC in the solution. They changed from 2.19 +- 0.17 (20 mA/cm2 ) and 3.03 +- 0.06 (30 mA/cm2) for CSiC 0 g/L to 3.27 +- 0.18 (20 mA/cm2) and 2.29 +- 0.63(30 mA/cm2) for CSiC 10 g/L. It was observed higher values of microhardness for coatings at CSiC 10 g/L than those at CSiC of 0 g/L. There are good prospects for CuZn-SiC composite coatings to be employed against erosion-corrosion, especially in low ig, where the copper content is higher.
Keywords
electrodeposition, copper-zinc (CuZn), composite coating, silicon carbide (SiC), alkaline solution sorbitol
