Lead forms a dense lead oxide film on the surface of the air, a lead carbonate film in the humid air containing carbon dioxide, and a lead sulfate film in sulfuric acid, which play a good protective role. Therefore, lead has excellent corrosion resistance in many media, especially in sulfuric acid. The corrosion rate in the atmosphere of lead industrial area is 0.00043~0.00068mm/a; The corrosion rate in natural seawater is 0.01~0.015mm/a; When the concentration of sulfuric acid is as high as 70% - 80% and the temperature is 50 ℃, lead still has good corrosion resistance.

Lead is initially oxidized to PbO2 during heating and melting, and then decomposed to PbO after heating, and Pb3O4 (i.e. lead) is generated when heating to 603-723K. Pb2O3 or Pb3O4 is easy to dissociate at high temperature to form stable PbO.