Study on Corrosion Behavior of Grounding Electrode Materials in Saline Soil Areas of Northwest China

The corrosion behavior of carbon steel, a grounding electrode material for power grids, in the northwest saline soil environment was studied by weight loss method, polarization curve and electrochemical impedance spectroscopy (EIS). The results show that the grounding electrode materials all undergo oxygen uptake reaction in the saline soil environment under laboratory simulated saline soil conditions, and the corrosion types are all localized corrosion. The grounding electrode does not increase the corrosion rate with the increase of alkalinity, when the pH = 12, passivation reaction occurred, corrosion was inhibited. After adding 2%, 4% and 6% chloride ions respectively and the negative direction of the corrosion potential shift is obvious, the corrosion rate is obviously accelerated, but at 4% the corrosion rate is the fastest, is only pH 22 times. The synergistic effect obviously accelerated the corrosion of the grounding electrode material and shortened the service life of the material.