Effect of Cobalt Additions on the Properties of Sterling Sliver Alloys
The objective of this research was to investigate the effect of Cobalt in as-cast sterling silver alloys used in jewellery industry on microstructure, mechanical properties, and tarnish resistance. The tarnish and corrosion resistance of sterling silver were improved with cobalt. This may be due to the grain refinement and the forming of cobalt oxide film on the surface of sliver alloy.
Sihai Jiao, Zhengyi Jiang and Jinglong Bu
X. Z. Xiang et al., "Effect of Cobalt Additions on the Properties of Sterling Sliver Alloys", Advanced Materials Research, Vols. 146-147, pp. 1350-1355, 2011