Electrochemical Corrosion Behavior of Bronze Artifact Materials Covered with Patina in Environment Simulation Solutions

The electrochemical corrosion behaviors of three kinds of patinated bronze and bare bronze in 3 environment simulation solutions were studied in terms of open circuit potential (OCP) and electrochemical impedance spectrum (EIS) to investigate the corrosion regularity of bronze artifact materials in different preservation environments. The results indicate that the bronze with Cu₂O had minimal corrosion tendency in three kinds of environment simulation solutions, while the bare bronze had the largest corrosion tendency. The corrosion degree of bronze samples in three kinds of environmental simulation solutions decreased according to the order of marine environment simulation solution > SO₂ environment simulation solution > atmospheric environment simulation solution. In the atmospheric environment simulation solution, the corrosion resistance of patinaed bronze increased with the increase of soaking time. In the marine environment simulation solution, bronze samples suffered severe corrosion, and their corrosion resistance could not be significantly improved with time. In the SO₂ environment simulation solution, the longer the bronze was preserved, the more serious the corrosion.