Abstract：The corrosion behaviors of the raw Q235 and hot- molten- aluminum- dipped (HMAD) Q235 steels were investigated in mass fraction of 3.5% sodium chloride solution. The surface morphologies of the samples before and after corrosion were detected using scanning electron microscopy (SEM). The corrosion rates of the raw Q235 and HMAD Q235 steels were studied by electrochemical impedance spectroscopy and a weight- loss method. The results showed that the corrosion rate of the raw Q235 among the three samples was the fastest with a value of about 0.11 mm/a (mm/year). The corrosion rates of HMAD Q235 steels with aluminum- dipping once and twice were 0.04 and 0.03 mm/a, respectively. The corrosion resistance of the raw Q235 steel was significantly enhanced after HMAD treatment, which indicated that HMAD was an effective way to improve the seawater corrosion resistance of Q235 steel.
2018, Vol. 28 
