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2017
- handle: 10670/1.q7xhg0
- hal: hal-02426592
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Isabel Tissot et al., « Silver-copper alloys corrosion mechanisms », HAL-SHS : histoire de l'art, ID : 10670/1.q7xhg0
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The conservation of silver alloys has been largely based on studies of pure silver atmospheric corrosion mechanisms, resulting in the identification of Ag 2 S as the main corrosion product and discarding the importance of the other alloy constituents. This work studies the early stages of the atmospheric corrosion of sterling silver, considering the role of copper and its subsequent influence on conservation assessment. After corrosion in a sulfide solution, copper and sterling silver samples were analysed by UV-visible spectrophotometry, scanning electron microscopy with energy-dispersive x-ray spectrometry and x-ray diffraction. Naturally corroded samples were also studied for comparison. The relation between colour and the thickening of the corrosion layer with the formation , over time, of different compounds could be shown. The heterogeneous and porous film developed during the first stages is then replaced