锡对斯特林银组织和性能的影响

Influence of Sn on Microstructure and Properties of Sterling Silver

研究了锡对斯特林银合金组织和性能的影响。结果表明:含锡1wt%以内有助于获得致密细小的晶粒,但锡超过一定量后组织明显粗大疏松。锡含量在0.5wt%以内时,银合金具有较好的冷加工性能,超过1wt%后合金的塑性显著下降,加工过程中易出现裂纹。锡可以提高斯特林银的腐蚀电位,提高其抗硫化变色和抗氧化性能,锡含量越高,合金的抗变色能力越好。综合考虑锡对斯特林银的组织和性能的影响,用于铸造成型的抗变色银合金,锡含量应控制在1wt%以内;用于冷加工成型时,锡含量应控制在0.5wt%以内。

The influences of Sn on the microstructure and properties of sterling silvers alloy were studied. Adding less than lwt% Sn into sterling silvers is beneficial to form compact and fine grain structure, however, when the amount of Sn exceeds a certain threshold, the structure will obviously become coarse and loosened. Adding less than 0.5wt% Sn, silver alloy has preferable cold working performance, but when Sn is more than lwt%, it will markedly decline the plasticity, causing the alloy easily crack during processing. Sn can raise the corrosion potential of sterling silver and improve the properties of anti-tarnishing and anti-oxidation, the more the mount of Sn, the better property of anti-tarnishing sterling silver. Synthetically considering the influences of Sn on the microstructure and properties of sterling silver, the mount of Sn should be less than lwt% in anti-tarnishing silver alloy for casting, while for cold working, it should be less than 0.5wt% .