Study on Atmospheric Corrosion Behavior of Q235 Galvanized steel in Substation

摘要

In this paper, the natural exposure corrosion behavior of Q235 galvanized steel in four different substation environment including urban population centers (A), rural settlements (B), industrial park (C) and chemical industrial park (D) are studied by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). In order to analyze the corrosion behavior comprehensively, the Q235 galvanized steel was insolated for 0～300 days. In addition, the corrosion morphology and corrosion products of Q235 galvanized steel were investigated by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). Consequently, it is speculated that Zn(OH)_2, ZnCO_3 and Zn_5(CO)_3(OH)_6 are the main corrosion products of galvanized steel. Moreover, it is found that the current density increase firstly and then reduce with the natural exposure extending. In general, corrosion products adhering to the galvanized steel surface can promote the corrosion resistance effectively and prevent the sample from corrosion.