Effects of pH values and temperature on the electrochemical corrosion behavior of galvanized steel in simulated rust layer solution

The effects of pH values and temperature on the electrochemical corrosion behavior of galvanized steel in simulated rust layer(SRL) solution were studied by using the polarization curves,electrochemical impedance spectroscopy and scanning electron microscopy(SEM).The results indicated that galvanized steel was in the passive state in high alkaline SRL solution,the corrosion resistance of galvanized steel increased with the increase of pH values of SRL solution.The corrosion rate of galvanized steel was almost invariant in temperature range from 0 to 40℃.However,when the temperature raised to 60℃,the corrosion rate of galvanized steel increased rapidly.