Effect of Sodium Benzoate Concentration in Ethylene Glycol-Water Solution onElectrochemical Behavior of 316L Stainless Steel

The electrochemical behavior of 316L stainless steel in ethylene glycol aqueous solution containing different amounts of sodium benzoate was studied by electrochemical method, and the corrosion morphology of 316L stainless steel was characterized by SEM. The results showed that the addition of sodium benzoate in glycol water solution could effectively inhibit the corrosion of 316L stainless steel. When the mass fraction of sodium benzoate not exceeded 1. 40%, with the increase of the content of sodium benzoate in glycol water solution, the charge transfer resistance of 316L stainless steel first increased and then decreased, the self corrosion density first decreased and then gradually increased, and the corrosion rate of 316L stainless steel showed a trend of first decreasing and then increasing. When the mass fraction of sodium benzoate in glycol water solution was 0. 80%, 316L stainless steel had the best corrosion resistance.