Experimental studies of mild steel corrosion inhibition in hydrochloric acid using inhibitor type sulfa drugs

• Adiba A. Mahmmod

Department of Chemical Engineering – College of Engineering – University of Diyala – Baquba City 32001, Daiyla governorate, Iraq

Abstract: A corrosion inhibitor is a chemical compound that, when added to a gas or liquid, decreases the process of corrosion. Sulfaguanidine is a guanidine derivative of sulfanilamide antibiotic used in veterinary medicine, the gut but is well suited for the treatment of bacillary dysentery and other enteric infections and sulfonamides are active against Gram-positive bacteria and Gram-negative bacteria. In the present work I studied the effect of Sulfaguanidine (SFGD) type inhibitor on carbon steel corrosion in a corrosive medium (HCl). For this, I used the weight loss measurements to evaluate the data of corrosion rate and the results showed that SFGD performed excellently as a corrosion inhibition of metal type carbon steel in hydrochloric acid environment. The inhibition of corrosion of the used metal in present work in corrosive solution (3% HCl) at the temperature range of (30–60°C) and (0.002–0.008 M) was studied in the absence and presence of the SFGD inhibitor used in this experimental work. Corrosion rate decreased with an increase in inhibitor concentration, also it increased with an increase in temperature while the efficiency of inhibition increased with an increase in SFGD concentration. The efficiency reaches a maximal value of 97.61% at 0.008 M at 30°C. The adsorption isotherm of inhibitor on metal surface used in this research was found to follow Langmuir, the kinetic–thermodynamic data and adsorption isotherms were used to evaluate the values of equilibrium constants (K).

Keywords: carbon steel, sulfa drugs inhibitor, adsorption, corrosive solution, weight loss technique

Int. J. Corros. Scale Inhib., 2019, 8, no. 4, 1112-1122 PDF (846 K)
doi: 10.17675/2305-6894-2019-8-4-18

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