银银与纯银
2023-03-25
Meetu jewelry
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纯银首饰很受欢迎。 然而，纯银的缺点之一是它很容易失去光泽。 有许多产品可以让纯银恢复美丽光泽，但在我们忙碌的生活中，我们常常没有时间来保养精美的纯银。
传统的纯银是银 (92.5%) 和铜 (7.5%) 的合金。 您经常会在珠宝上发现数字 925，保证该首饰的银含量为 92.5%。
纯银太软，无法用于大多数珠宝，但添加少量铜后，银会变得更坚固，同时保留其成型和焊接的能力。 问题是纯银会因空气中的硫化合物与铜发生反应而迅速失去光泽。 铜和硫反应的结果是在金属上形成深色锈斑。
银银基本上消除了失去光泽的问题。 它是当今最耐变色的银。 米德尔塞克斯大学 (Middlesex University) 教授兼银匠彼得·约翰斯 (Peter Johns) 在 20 世纪 90 年代发现他可以制造出不会出现变色问题的现代纯银。 这是通过用 1% 的锗代替铜来实现的。 银含量仍保持在 92.5%，但银银不易变色。
锗喜欢氧气！在空气中，银中的锗首先在铜和银上氧化，形成看不见的氧化锗保护表面层。 氧化物能够在环境温度下通过锗原子迁移到表面来不断补充自身。 锗的优先氧化可防止形成变色。 这可以让您的银首饰看起来很漂亮，而无需经常清洁锈迹。
当使用银合金时，它们在成型或成型过程中需要柔软且具有延展性。 然而，成品必须坚硬耐用，这样金属才不易被划伤、凹陷和变形。
银在完全柔软的状态下能够形成复杂的形状。 很容易焊接和镶嵌宝石。 当珠宝首饰的构造完成后，可以通过简单的热处理轻松硬化。 银银的硬度显着提高，且没有淬火相关的风险。
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