Study on Electrochemical Corrosion Behaviors of Enamel Coating Prepared from Titanium Tailings

The enamel coating was prepared from the titanium tailings in Panzhihua area,and the electrochemical corrosion behaviors of the enamel coating in 30% HCl solution were studied using potentiodynamic polarization curve(Tafel) and electrochemical impedance spectroscopy(EIS).The results show that the amount of bubbles in the enamel coating and the iron oxides-iron phase dendrite structures increase,and the island and anchor structures are obviously embedded into each other,with the increase of the addition of titanium tailings.The polarization curve E_corr of the enamel coating in 30% HCl solution decreases with the increase of titanium tailings content,and the corrosion rate increases.A large radius of capacitive reactance arc is found in the high-frequency region of electrochemical impedance spectroscopy Nyquisy,and the diffusion effect can be observed in the low-frequency region where the phase angle θ is near 5° and log|Z|~logf diagram approximates to a horizontal line.The coating presents as pure resistance with high impedance.Therefore,the optimal content of titanium tailings is 8%~10%.