锌对925银抗变色性能的影响

Effects of Zn Addition on the Anti-Tarnishing of 925 Silver Alloys

研究添加0～2.5%(质量分数,下同)的Zn对925银合金抗变色性能的影响。物相分析、铸造分析、显微组织观察、抗变色性能试验结果表明,添加0.5%～1%的Zn对提高925银合金抗变色性能较为明显有效,主要原因是表面形成一层氧化锌膜。此外,合金中添加Zn可起到增亮的效果,并改善其铸造性能。

The effects of 0-2.5wt%Zn addition on the anti-tarnishing of 925 silver alloys were investigated,The results of phase analysising,casting analysising,microstructure observation,and anti-tarnishing performance test show that adding of 0.5wt%～1wt% Zn will improve the anti-tarnishing of 925 silver alloy obviously which is attributed to a layer of zinc oxide film formed on the surface.Adding of Zn can play a role of brightening effect and improve the casting properties.