銀銀與純銀
2023-03-25
Meetu jewelry
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純銀首飾很受歡迎。 然而，純銀的缺點之一是它很容易失去光澤。 有許多產品可以讓純銀恢復美麗光澤，但在我們忙碌的生活中，我們常常沒有時間來保養精美的純銀。
傳統的純銀是銀 (92.5%) 和銅 (7.5%) 的合金。 您經常會在珠寶上發現數字 925，保證該首飾的銀含量為 92.5%。
純銀太軟，無法用於大多數珠寶，但添加少量銅後，銀會變得更堅固，同時保留其成型和焊接的能力。 問題是純銀會因空氣中的硫化合物與銅反應而迅速失去光澤。 銅和硫反應的結果是在金屬上形成深色鏽斑。
銀銀基本上消除了失去光澤的問題。 它是當今最耐變色的銀。 米德爾塞克斯大學 (Middlesex University) 教授兼銀匠彼得·約翰斯 (Peter Johns) 在 20 世紀 90 年代發現他可以製造出不會出現變色問題的現代純銀。 這是透過用 1% 的鍺代替銅來實現的。 銀含量仍維持在 92.5%，但銀銀不易變色。
鍺喜歡氧氣！在空氣中，銀中的鍺首先在銅和銀上氧化，形成看不見的保護性氧化鍺表面層。 氧化物能夠在環境溫度下透過鍺原子遷移到表面來不斷補充自身。 鍺的優先氧化可防止形成變色。 這可以讓您的銀飾看起來很漂亮，而無需經常清潔鏽跡。
當使用銀合金時，它們在成型或成型過程中需要柔軟且具有延展性。 然而，成品必須堅硬耐用，這樣金屬才不易被刮傷、凹陷和變形。
銀在完全柔軟的狀態下能夠形成複雜的形狀。 很容易焊接和鑲嵌寶石。 當珠寶首飾的構造完成後，可以透過簡單的熱處理輕鬆硬化。 銀銀的硬度顯著提高，且沒有淬火相關的風險。
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