Abstract
This paper establishes a comparison between the interface exhibited by an archaeological bronze alloy when previously submitted to a burial environment and a chloride electrolyte. The SEM-EDAX analysis shows that the archaeological surface exhibited a three layered structure characterized by a tin enrichment at the inner layer, the succeeding layer being only by copper species, the outer layer is relevant of the burial environment. This corrosion structure is to be regarded as Type I morphology described in the literature for bronzes exhumed in the northern side of the Mediterranean Sea. When submitted to chloride solution, the open circuit potential of material tends to constant values after five days of immersion time. The evolution of the resulting interface was characterized using EIS and the spectra obtained were tentatively fitted using a simple electrical equivalent circuit. When, the interface attained the steady state, the interface shows a patina with two layered morphology similar to the archaeological one.
Published Version
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