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首页> 外文会议>European corrosion congress;EUROCORR 2010 >Enrichment of Silver at the Gold Layer of Gilt Silver Embroidery Wires of Qaaba Curtains
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Enrichment of Silver at the Gold Layer of Gilt Silver Embroidery Wires of Qaaba Curtains

机译：Qaaba窗帘镀金银绣线金层上的银富集

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The deterioration of metal threads occurs because of the environmental conditions and also because of the contact with textile fibers. The main corrosion products of gold gilt silver threads (e.g. wires, strips) are silver sulphide (Ag_2S) crystals grown on the gold coating surface in flower-like shape. The formation of Ag_2S by the corrosion of silver based historical objects is previously documented. In gold coated silver electronic products, diffusion of silver and its enrichment at the surface of gold coating layer produced silver sulfide when the gilt layer was contaminated with sulfur and heated by the passage of current. It is reported that sulfuric atmosphere and temperature accelerated the silver diffusion process. The present work is the first communication about silver enrichment towards the outer surface of gold coating on gilt silver wires. The formation of Ag_2S corrosion products are visualized by field emission scanning electron microscope (FE-SEM). In addition to this technique, Raman spectroscopy is used to identify the corrosion products on the gilt layer surface. The enrichment of silver towards the gold layer outer surface is investigated by using Field Emission Electron Microscope and concentration profiles of silver, sulfur and gold in gold layer were obtained. The results showed that silver sulfide crystals were present at the surface of two gold gilt silver wires dating from 16th century but not at the surface of two wires dated from 18th and 19th centuries. However all the gold layers on four wires investigated contained sulfur. Wires dated from 16th century exhibited silver enrichment near the outer surface of gold coatings. The presence of sulfur in gold layer may be related to its production method. However diffusion of gold in silver and diffusion of silver in gold is related to the heat used during the production of gold gilt silver wires.
机译：金属丝的劣化是由于环境条件以及与纺织纤维的接触而发生的。金镀金银丝（例如金属丝，金属条）的主要腐蚀产物是在金涂层表面上呈花状生长的硫化银（Ag_2S）晶体。先前已记录了通过腐蚀银基历史物体形成Ag_2S的过程。在镀金的银电子产品中，当the镀层被硫污染并通过电流加热时，​​银的扩散及其在金涂层表面的富集会产生硫化银。据报道，硫酸气氛和温度加速了银的扩散过程。本工作是关于镀金银线上金涂层外表面银富集的首次交流。通过场发射扫描电子显微镜（FE-SEM）观察到Ag_2S腐蚀产物的形成。除此技术外，拉曼光谱法还用于识别镀金层表面上的腐蚀产物。使用场发射电子显微镜研究了银向金层外表面的富集，并获得了金层中银，硫和金的浓度分布。结果表明，硫化银晶体存在于16世纪的两条金镀金银线表面，但不存在于18和19世纪的两条金线表面。但是，研究的四根导线上的所有金层都含有硫。始于16世纪的金属丝在金涂层的外表面附近表现出银富集。金层中硫的存在可能与其生产方法有关。但是，金在银中的扩散和银在金中的扩散与金金银线生产过程中使用的热量有关。

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