分析了我厂银币表面缺陷形成的原因,并提出了在银币表面施加保护膜的设想,通过各种防变色工艺实验,提出了采用电解保护和浸渍抗变色剂的多层组合防护膜保护工艺方案.实验表明,经过该保护工艺处理的银币自然放置半年无白斑及其他变色现象产生,在40 ℃,3 mg/L硫化氢气体和3%硫化钾溶液中耐蚀时间为130 min,分别为未经处理银币的耐蚀时间的10倍和26倍.
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