The Atmospheric Corrosion Factors Of Bronze

Bronze is the important historical and cultural heritage in our country. Its non-renewable feature makes its protection important. The atmospheric corrosion factors which include air pollution, illumination, temperature and humidity in the museum exhibition shelves have serious harm to bronze. Therefore, the study of atmospheric corrosion behavior and laws to bronze has the important theoretical value and practical significance.This article mainly uses the semiconductor micro balances (QCM) to situ monitor the atmospheric corrosion behavior of semiconductor vibration plated copper tin alloy under SO2, NO2 and their mixing atmosphere and in a simulated museum exhibition shelves, then gets the corrosion kinetics curves. In combination with scanning electron microscope (SEM), energy spectrometer (EDS) and X-Ray photoelectron spectroscopy (XPS) analysis methods to analyze vibration silicon wafer surface corrosion products, and presumes atmospheric corrosion mechanism of the simulated bronze relics material.The results show that SO2, NO2 can accelerate the atmospheric corrosion of simulated bronze material, and they have a synergistic effect. Increasing SO2, NO2 gas concentration and reaction temperature will accelerate the bronze relics simulated material in different degrees of corrosion speed. The existence of the light and the rise of temperature and humidity will accelerate the corrosion of bronze relics simulatied material, sheng halogen lamp has worst corrosive affected for bronze relics simulated material, and the corrosion of bronze relics simulatied material is more serious under high temperature. The main corrosion products of the bronze relics simulatioed material corroded 60 days under the condition of light are CU2O, CuO, SnO, SnO2, followed by copper sulfate, copper nitrate, copper carbonate, copper sulfide and copper chloride.