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Discharge cleaning of corroded silver surface
Brecelj, Franc ...
Discharge cleaning has become a routine treatment in conservation of archeological artifacts. Most of the authors put their attention to the reduction of metal oxides. However, in the present paper ...we show that by this treatment it is often possible not only to remove oxygen from the surface but also sulphur and chlorine. Experiments were carried out in low pressure hydrogen plasma with the density of ▫$2.10^16 m^{-3}$▫ and the electron temperature of 6 eV. The concentration of S and Cl in the surface layer of artificats was measured with electron microprobe. We have found out that aftera sample in exposed to hydron plasma, the concentration of S and Cl decreases. However, traces of these elements still remain. This is due to the fact that a layer of loosey bound impurities rich in Fe remain on the surface.It cannot be removed by plasma but effectively by ultrasound treatment. Repeating the discharge and the ultrasound cleaning enabled us to decrease the concentration of Cl and S below the detection limit of our microprobe.
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