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The tarnishing of silver artefacts surface, that are exposed in museums or kept in storage, is a reason that makes them inappropriate for displaying. In this work the conditions for tarnish removal (horn silver and silver sulphide) from silver artefacts surfaces by an electrochemical galvanic cell of silver/aluminium in sodium carbonate electrolyte are investigated. For this purpose sterling silver drawn sheet coupons were tarnished by different chemical methods so as to produce a corrosion layer containing mainly silver chloride or silver sulphide compounds. An extensive study of the produced corrosion layers was performed by X–ray diffractometry, scanning electron microscopy and surface analysis. Measurements of galvanic current were taken by shorting the corroded silver and aluminium sheet together through a potentiostat. Possible cathodic reactions and their effect on the overall galvanic current are discussed.
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Novaković et al. (2013) studied this question.
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