![]() ![]() Subsequently, the main part of scotlandite is displaced, forming a protective film of anglesite. Upon further exposure to the atmosphere, carbonates react with sulfur dioxide (SO 2) and sulfur trioxide (SO 3) and form a film, which consists of a mixture of scotlandite (PbSO 3) and anglesite (PbSO 4). By entering a condensed water drop, carbon dioxide leads to the formation of lead carbonates, primarily cerussite (PbCO 3) and hydrocerussite (Pb 3(CO 3) 2(OH) 2). Water serves as an electrolyte and provides a medium for dissolving the entire spectrum of the atmosphere’s gases. ![]() The main cause of lead corrosion is the presence of humidity condensed on its surface. Lead is quite well preserved in atmospheric conditions as it forms a thin oxide film which protects the base metal from any damaging influence of the environment. Lead is one of the first metals that became known to humans and many museums around the world store lead objects in their collections. ![]()
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