Corrosion inhibition of carbon steel in saline water using an azo dye at various concentrations

• R.A. Mohammed and S.Z. Hussein

Department of Chemistry, Collage of Science, University of Baghdad, Jadriyah, Baghdad, 10011, Iraq

Abstract: Potentiodynamic measurements were used to examine the corrosion-inhibiting impact of 4-[6-bromo-benzothiazolylazo]thymol (BTAT) on low carbon steel (LCS) in 3.5% NaCl solution at various temperatures (293–323 K) and concentrations. It was discovered that with increasing concentration of BTAT dye, the inhibition efficiency (IE%) increased up to 94.6%. Additionally, the results indicated that as the temperature increases, the inhibition efficiency diminishes. As the inhibitor concentration is increased to 70 ppm, the corrosion rate decreases. By calculating the temperature dependence of corrosion rate derived from Tafel plots, the effective activation energy was determined both in the absence and in the presence of various concentrations of BTAT dye. Atomic force microscopy (AFM) was utilized for characterizing the morphological properties of the metal surface before and after addition of the dye. Moreover, the dye revealed antibacterial ability against gram positive (Staphylococcus aureus) and gram negative bacteria (Escherichia coli).

Keywords: 4-[6-bromobenzothiazolylazo]thymol (BTAT), low carbon steel (LCS), electrochemical measurements, azo dye, inhibitors, corrosion

Int. J. Corros. Scale Inhib., 2024, 13, no. 1, 241-253
doi: 10.17675/2305-6894-2024-13-1-12

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