Effects of pH and Chloride Ions on the Corrosion Behavior of Zinc-clad Steel in the Simulated Soil Solution

Abstract

The study was about the corrosion behavior of zinc-clad steel in simulated soil solution suffered from pH and chloride ions using polarization curves, electrochemical impedance spectroscopy and total immersion weight loss technique. The results showed that the corrosion rate of zinc-clad steel was decreased with the increase of pH value of 6, 7, 8 in simulated soil solution and increased with the increasing of chloride concentration ranged from 2 to 6g/L. while the rate was decreased gradually with the increasing of chlorine ions in the range from 6 to 10 g/L. With the increase of immersion time, the corrosion rate of zinc-clad steel was firstly decreased and then increased. The bottom of zinc-clad cylinder, which was the junction of zinc and steel, suffered severe galvanic corrosion, pitting and corrosion rate was greater than its side.