Corrosion Behavior of Copper in the Country Atmospheric Environment of Qingyuan

The corrosion behavior of copper exposed to the country atmosphere of Qingyuan for different times was studied by metallographic microscopy, scanning electron microscopy, X-ray diffraction, energy dispersive spectra and electrochemical impedance spectroscopy. The results showed that localized corrosion occurred after copper was exposed to the country atmospheric environment of Qingyuan. When the exposure time was prolonged, the corrosion products increased and gradually covered the copper surface to form a relatively dense film, leading to a decrease of corrosion rate. The main corrosion products were Cu₂O in the first 6 months of exposure. With the extension of exposure time, the effect of other pollutants in the atmosphere on the corrosion of copper increased. CuS and CuOHCl also appeared in the corrosion products after 12 months of exposure.