Corrosion inhibition of thiadiazole derivative for mild steel in hydrochloric acid solution

• R.D. Salim¹, Q.A. Jawad^2,3, K.S. Ridah³, L.M. Shaker³, A.A. Al-Amiery³, A.A.H. Kadhum⁴ and M.S. Takriff⁵

¹ Department of Machinery Equipment Engineering Techniques, Technical College Al-Musaib, Al-Furat Al Awsat Technical University, Al-Musaib, Babil 51009, Iraq
² Electrical Engineering Department, University of Technology, Baghdad 10001, Iraq
³ Energy and Renewable Energies Technology Center, University of Technology, Industrial Street, Baghdad 10066, Iraq
⁴ University of Al-Ameed, Karbala, Iraq
⁵ Department of Chemical & Process Engineering, Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia, Bangi, Selangor 43600, Malaysia

Abstract: In the various industries such as pickling, gas and oil industries in which an acid medium, especially hydrochloric acid, is used, the corrosion of mild steel significantly increases destruction with a huge financial loss. The best method for preventing corrosion of mild steel alloy is to use an impermeable layer over the target alloy. The coatings are not constantly impervious, and all coating techniques finally fail for various reasons and therefore, anti-corrosion agents are added. The inhibition impact of new corrosion inhibitor entitled
“5,5´-(1,4-phenylene)bis(N-benzylidene-1,3,4-thiadiazol-2-amine)” (PBTA) on the surface of mild steel corrosion in 1 M HCl media was studied using weight loss techniques. The surface of mild steel was exposed to investigated solution and evaluated using scanning electron microscopy (SEM). Effects of the concentration of PBTA, acidic content, temperature variation and immersion time were investigated. PBTA has excellent inhibitive performance on the corrosion of mild steel in 1 M HCl solution and enhanced with an increase in PBTA inhibitor concentration, while decreasing with a decrease in immersion time and corrosion temperature. The adsorption of the synthesized corrosion inhibitor on the surface of mild steel obeys the Langmuir adsorption isotherm. Various spectroscopic techniques such as ¹H NMR (Proton nuclear magnetic resonance), ¹³C NMR (Carbon-13 nuclear magnetic resonance) and FTIR (Fourier-transform infrared) were used for confirmation of the structure of the corrosion inhibitor molecule.

Keywords: mild steel, PBTA adsorption isotherm, weight loss, inhibitor

Int. J. Corros. Scale Inhib., 2020, 9, no. 2, 550-561 PDF (436 K)
doi: 10.17675/2305-6894-2020-9-2-10

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