Corrosion Behavior of Q235B Steel and Galvanized Steel for Electrical Equipment Framework Components in Industrial High Humidity and Heat Environment

The corrosion behavior of Q235B steel and galvanized steel in mixed solution of NaHSO₃ and NaCl was studied by neutral salt spray test. The corrosion resistance of two materials was analyzed by scanning electron microscopy and electrochemical test. The results showed that with the increase of corrosion time, the surface corrosion products of Q235B steel changed from flake γ-FeOOH to spherical α-FeOOH, and the surface corrosion product layer of Q235B steel and galvanized steel became compact gradually, the low frequency capacitive reactance arc radius and the charge transfer resistance of galvanized steel showed a trend of first decreasing and then increasing. In the process of salt fog corrosion, the corrosion of Q235B steel corrosion current density was greater than that of galvanized steel, the charge transfer resistance of galvanized steel was higher than that of Q235B steel, indicating that the corrosion resistance of galvanized steel was better than that of Q235B steel.