Corrosion Behavior of Galvanized Q235 Steel for Grounding in Acid Soils

Electrochemical behavior of galvanized Q235 steel for grounding in acidified soils with different pH value was investigated utilizing electrochemical impedance spectrum (EIS) and poten- tiodynamic polarization tests. Results showed that the corrosion behavior of galvanized Q235 steel in acid soils presents an adsorption of intermediate corrosion products in the early stage, and a low frequency inductive loop then induced in Nyquist plot. With the formation of corrosion products on the surface of the steel, the inductive loop disappeared, the low frequency capacitive arc enlarged gradually. The corrosion process is mainly controlled by the cathodic process. The corrosion rate of the galvanized Q235 steel decreased with the increasing pH of the acidified solution, it also in- creased and then decreased with the increasing time.