Effect of SiC and Al2O3 particles on the electrodeposition of Zn, Co and ZnCo: II. Electrodeposition in the presence of SiC and Al2O3 and production of ZnCo–SiC and ZnCo–Al2O3 coatings

Abstract

SiC or Al 2 O 3 microsized particles were added to acid sulfate-based solutions for the electrodeposition of Zn, Co, and ZnCo. Initially, their effects on the electrochemical processes were evaluated. The Zn electrodeposition rate was increased in both SiC and Al 2 O 3 -loaded solutions. The Co electrodeposition rate was also increased by SiC. However, Al 2 O 3 decreased it, especially at the beginning. Both SiC and Al 2 O 3 influenced the electrodeposition of ZnCo positively at moderate loadings. The factors involved in producing ZnCo-SiC and ZnCo-Al 2 O 3 composites were evaluated. ZnCo-SiC composites could be deposited with a higher [Co/Zn] ratio in the metal matrix than for pure ZnCo. In ZnCo-Al 2 O 3 , the [Co/Zn] ratio was smaller than in ZnCo and ZnCo-SiC. It was necessary to reduce the CoSO 4 concentration to improve the Al 2 O 3 co-deposition. The variation in [Co/Zn] ratio could, in principle, be related to the effects of SiC and Al 2 O 3 on the individual Zn and Co electrodeposition.

Electrodeposition of Metal Matrix Nanocomposites: Improvement of the Chemical Characterization Techniques

“…A variety of nanosized particles, ranging from 4 nm to 800 nm diameters, have been successfully incorporated into metallic electrodeposits (Low et al, 2006). These include oxides such as Al 2 O 3 , ZrO 2 , TiO 2 and Cr 2 O 3 or carbides like SiC, WC, TiC or nitrides like Si 3 N 4 (Bahrololoom & Sani 2005;Jung et al, 2009;Srivastava et al, 2010;Krishnaveni et al, 2008;Stroumbouli et al, 2005;Gay et al, 2001).The metals mostly used are copper and nickel (Low el al., 2006) however other metals like zinc, silver and, alloys have been used (Gomes et al, 2005;Gay et al, 2001;Tulio & Carlos 2009;Muller et al, 2002;Tian & Cheng, 2007). The most studied system has been the Ni-SiC due to its potential technological applications (Low et al, 2006;Hovestad & Janssen 1995;Zimmermann et al, 2002;Hou et al, 2002;Garcia et al 2001;Gyftou et al, 2005;Lekka et al, 2005).…”

The Effect of Direct and Pulsed Current in the Presence of Surfactants on the Electrodeposition of Zn–SiC Nanocomposite Coatings

“…Silicon carbide (SiC) micro-and nano-particles are of considerable interest as the reinforcing phase [3,4,7,8]. The matrix phase studied so far has been mainly Ni and its alloys [3,[9][10][11][12][13][14], whereas much less has been reported on SiC co-electrodeposition with Zn [15][16][17][18].…”

Self-lubricating metal-matrix composite CuZn-graphite coatings obtained by electrodeposition from near neutral solutions. Surface morphological analyses and chemical composition

“…Apart from that, this enrichment in Cu could improve corrosion resistance of the coating. Compositional variation of the metal-matrix in electrocomposite coatings literature is a normal finding [20,21,22,23] and is also now observed for CuZn-graphite form citrate solutions.…”