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Abstract

The application of reducing, low pressure, radio frequency plasma at temperatures in the range 240–400°C for the conservation of iron artefacts has been studied. For this purpose, steel oxidised either in a salt spray cabinet or in the soil, together with excavated objects from a collection from Mount Athos, were treated. Post-corrosion experiments, including electrochemical polarisation studies and exposure in a humid atmosphere, revealed improved behaviour for specimens treated in H₂ plasma diluted with N₂ and CH₄. Using instrumental neutron activation analysis, measurements were made of the chloride ion removal from the corrosion layer after H₂ plasma treatment. This was found to be a consequence of heating rather than of the plasma treatment.

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Effect of heat treatment in reducing plasma environments on chloride ion removal and corrosion of oxidised steel artefacts

Abstract

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