Corrosion Behavior of Brass with SO₂ Pollutants Deposited on Surface in Atmosphere

The corrosion behavior of brass with SO₂ pollutants deposited on surface in atmospheric environment was investigated by electrochemical impedance spectroscopy (EIS) and scanning Kelvin probe (SKP) techniques. The corrosion products were characterized by XRD. The results showed that the corrosion resistance of brass with SO₂ pollutants deposited on surface was much smaller than that without surface deposition of SO₂ pollutants. The more the surface deposition of pollutants SO₂, the smaller the corrosion resistance. With the extension of corrosion time, more and more corrosion products were produced on the surface of brass. The surface Volta potential shifted positively and the activity of corrosion reaction reduced. The main components of corrosion products of brass were ZnSO₄·7H₂O, CuSO₄·3H₂O, ZnO, and a small amount of Zn(OH)₂, Cu(OH)₂ and CuO.