Electrochemical Property Study of Water-Wall Tube 20G in SO42- Medium at Room Temperature

In the article, the effect of SO42- on the corrosion behavior of boiler water-wall material 20G under the equilibrium phosphate treatment (EPT) was studied by a series of electrochemical experiments at room temperature. Electrodes AC impedance value (Rp) was used to evaluate the corrosion resistance of the material. The experiment results show that, SO42- ion is aggressive anion; water-wall tube material 20G has certain sensitive corrosion to the SO42- . The 20G electrode AC impedance value decreases with the increase of the SO42-’s concentration and the material corrosion resistance reduces.