Corrosion Behavior of Antique Bronze (High Tin and High Lead) in Simulated Acidic Soil Solution

Using metallographic microscopy, scanning electron microscopy, X-ray diffractometer, electrochemical workstation and other instruments, combined with immersion test and other methods, the micro morphology of antique bronze material (high tin and high lead) and its corrosion behavior in simulated acid soil solution were studied. The results showed that there were α phase, (α+δ) phase and free Pb phase in the bronze material. In the simulated acid soil solution environment, the free state Pb phase was most prone to corrosion, and white corrosion products would be formed after corrosion. The corrosion of α phase and (α+δ) phase belonged to uniform corrosion, and yellow fine granular corrosion products were formed after corrosion. The main components of corrosion products were Cu₂O, SnO₂ and PbO. The corrosion rate of the sample increased with the extension of the test time in the early stage of corrosion (0-10 d), and decreased with the extension of the test time in the later stage of corrosion (10-180 d).