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The Effect of Dispersion Phases of SiC and Al2O3 on the Properties of Galvanic Nickel Coatings

Kozik A., Nowak M., Gawlik M., Bigaj M., Karaś M.

Archives of Metallurgy and Materials

2016

Vol. 61, iss. 1

375--380

In this study, Ni, Ni-SiC and Ni-Al2O3 coatings were electroplated on the 2xxx series aluminium alloy. The following parameters of the electroplating process were applied: current density - 4A/dm2, time - 60 minutes, and temperature - 60°C. Hard particles of submicrometric size were used. The results of the research showing the effect of the addition of hard particles (introduced into the nickel bath as a dispersed phase) on the properties of coatings, including the effect of the type (SiC or Al2O3) and content (0, 25, 50 g / l) of these particles, were discussed. Based on extensive investigations, it was found that the type of ceramic particles significantly affects the structure of produced coatings. The dispersed particles incorporated into the nickel coatings improve their abrasion resistance. Improving of the corrosion properties were observed only in the case of coatings containing silicon carbide particles.

Comparison of the properties of nickel coatings reinforced with dispersion SiC particles of micrometric, submicrometric and nanometric size deposited on the 5xxx series aluminium alloy

Najder A., Nowak M., Bigaj M., Żelechowski J., Opyrchał M., Karaś M

Archives of Metallurgy and Materials

2014

Vol. 59, iss. 1

349--353

In this study, Ni-SiC composite coatings were electroplated on the 5xxx series aluminium alloy substrate. The effect of the quantity (25g/l i 50g/l) and the size (3 m, 0,41 m and 50nm) of SiC particles introduced into the bath as a dispersed phase on properties of the coatings was tested. The influence of these parameters on thickness, microhardness, surface structure, abrasion resistance and corrosion resistance of nickel composite coatings was determined.

W niniejszej pracy powłoki Ni-SiC, osadzano elektrolitycznie na stopie aluminium serii 5xxx. Przedstawiono wyniki badań dotyczące wpływu ilości (25g/l i 50g/l) oraz wielkości cząstek SiC (3 m, 0,41 m oraz 50nm), wprowadzanych do kąpieli niklowych jako faza zdyspergowana, na właściwości otrzymanej powłoki niklowej. Określono wpływ tych parametrów na grubość, mikrotwardość, strukturę powierzchni, odporność na ścieranie oraz odporność korozyjną otrzymanych kompozytowych powłok niklowych.