The Corrosion Behavior of a New Acid Resistant Steel in a Concentrated Sulphuric Acid Solution Containing HCl

The corrosion behaviors of a new acid resistant steel and Q235 steel were investigated by weight loss measurements in a solution of 16.9% H2SO4+0.35% HCl at 60 ℃,potentiodynamic polarization,electrochemical impedance spectroscopy (EIS) and scanning electron microscopy.The results showed that the corrosion rate of Q235 steel was high,it had poor corrosion resistance and grooving corrosion was detected by scanning electron microscopy (SEM) on the surface of Q235 steel,but the new acid resistant steel showed the oppsite.The resistance to sulfuric acid and hydrochloric acid of the new steel was excellent.It was improved with the addition of Cu,Sb and Mo alloying elements.