Effect Of Ozone On Corrosion Behaviour Of Bronze Relics

Museum environment refers to the overall independent room to keep and display the relics. Among many pollutants in museum environment, ozone as an oxidant, has strong oxidation and potential damage effect. Ozone not only can result in degradation of organic cultural relics such as textile and dye, but also can damage metallic cultural relics. Serious damage from ozone to the cultural relics has attracted wide attention of domestic and international experts.Bronze is an alloy mainly made by Cu and Sn. In this study quartz crystal microbalance (QCM) was used to monitor the frequency change of Cu-Sn electrodeposited quartz crystals exposed to ozone and its compounds to obtain the corrosion kinetic curves. Corrosion rates were calculated. Combining with the scanning electron microscope (SEM), energy disperse spectroscopy (EDS), raman spectroscopy (RS) and x-ray photoelectron emission microscopy (XPS) to obtain suface morphology and main constituent of the corrosion product to prove the corrosion kinetics obtained by QCM. At last the relationship between corrosion rate and environmental impacting factors was initially built by generating the dose-response function to provide basis for the establishment of museum quality standard.Analysis indicated that the extent of corrosion was influenced by both ozone concentration and temperature. The analysis of Raman spectroscopy and XPS indicated that the inner corrosion product layer may included Cu2O, SnO, PbO and the ourter part were CuO, Cu2(OH)2CO3. SnO, SnO2and PbCO3after1day corrosion in the ozone. The corrosion product was also analysed after10days. The inner corrosion product layer may included Cu2O, SnO and PbO and the ourter part were CuCO3, SnO2and PbCO3.Besides, the extent of corrosion was influenced by formic acid concentration. Acetic acid+ozone made bigger contributions than either one by itself. The effect of formic acid on the corrosion was stronger than acetic acid.