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Abstract The present paper studies the corrosion mechanisms of blue enamel powder samples, immersed in water, reproduced according to historic recipes from an 18th-century manuscript. The pH increase of the… Click to show full abstract
Abstract The present paper studies the corrosion mechanisms of blue enamel powder samples, immersed in water, reproduced according to historic recipes from an 18th-century manuscript. The pH increase of the electrolyte reveals an ionic exchange between the alkaline ions of the glass and the hydrogen-bearing ions of the water. With the lixiviation of the alkaline components, cobalt is influenced by other neighbouring ions, leading to a change of enamel colour. In two high-lead samples, hydrated lead white and Co 2+ /Co 3+ spinels were identified, which explains their complete colour fade. The influence of Pb 2+ ions may increase in detriment of the Co 2+ ions.
Journal Title: Corrosion Science
Year Published: 2018
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