Inhibition effect of sodium benzoate, zinc benzoate and zinc bromide on low carbon steel corrosion in dilute H2SO4 and HCL solution

Abstract

The corrosion inhibition performance of inorganic chemical compounds of sodium benzoate, zinc benzoate and zinc bromide on low carbon steel was studied in 0.5 M H₂SO₄ and HCl solution at volumetric concentrations of 10%, 30%, 50% and 70%. Results obtained from LCS inhibition in H₂SO₄ showed sodium benzoate performed poorly with highest and lowest inhibition efficiency value of 50.5% and 36.24% at concentrations of 70% and 10%. Zinc bromide performed most effectively in H₂SO₄ with highest and lowest results of 90.96% and 76.96% at concentrations of 50% and 10%. Zinc benzoate displayed good results with peak value of 88.32% at 70% concentration and lowest value of 46.79% at 10% concentration. The corresponding performance of the compounds in HCl solution showed zinc benzoate performed more effectively with highest and lowest value of 70.17% and 33.26% at concentrations of 50% and 10%. Sodium benzoate and zinc bromide displayed average performance in HCl solution with optimal values of 67.38% and 55.40% at 30% concentration. Statistical analysis through analysis of variance showed exposure time is the only relevant factor (independent variable) in both acids responsible for the inhibition performance of the compounds with significance factor above 100%. The second independent variable (inhibitor concentration) was determined to be statistically irrelevant with significance factor below zero.