Electrochemical investigation on the corrosion inhibition of mild steel by Quinazoline Schiff base compounds in hydrochloric acid solution

Ghulamullah Khan; Wan Jeffrey Basirun; Salim Newaz Kazi; Pervaiz Ahmed; Ladan Magaji; Syed Muzamil Ahmed; Ghulam Mustafa Khan; Muhammad Abdur Rehman; Ahmad Badarudin Bin Mohamad Badry

doi:10.1016/j.jcis.2017.04.061

Electrochemical investigation on the corrosion inhibition of mild steel by Quinazoline Schiff base compounds in hydrochloric acid solution

J Colloid Interface Sci. 2017 Sep 15:502:134-145. doi: 10.1016/j.jcis.2017.04.061. Epub 2017 Apr 30.

Authors

Ghulamullah Khan¹, Wan Jeffrey Basirun², Salim Newaz Kazi³, Pervaiz Ahmed⁴, Ladan Magaji², Syed Muzamil Ahmed³, Ghulam Mustafa Khan⁵, Muhammad Abdur Rehman⁶, Ahmad Badarudin Bin Mohamad Badry³

Affiliations

¹ Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603, Malaysia; Department of Chemical Engineering, Faculty of Engineering, Balochistan University of Information Technology, Engineering and Management Sciences, Airport Road, Baleli, Quetta 87650, Balochistan, Pakistan. Electronic address: gu_khan@hotmail.com.
² Department of Chemistry, Faculty of Science, University of Malaya, 50603, Malaysia.
³ Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603, Malaysia.
⁴ Department of Physics, Abbottabad University of Science and Technology, Havelian, Khyber Pakhtunkhwa, Pakistan.
⁵ Department of Chemistry, Faculty of Science, University of Balochistan, Quetta 87500, Pakistan.
⁶ Department of Geology, Faculty of Science, University of Malaya, 50603, Malaysia.

PMID: 28478220
DOI: 10.1016/j.jcis.2017.04.061

Abstract

The inhibitory effect of two Schiff bases 3-(5-methoxy-2-hydroxybenzylideneamino)-2-(-5-methoxy-2-hydroxyphenyl)-2,3-dihydroquinazoline-4(1H)-one (MMDQ), and 3-(5-nitro-2-hydroxybenzylideneamino)-2(5-nitro-2-hydroxyphenyl)-2,3-dihydroquinazoline-4(1H)-one (NNDQ) on the corrosion of mild steel in 1M hydrochloric acid were studied using mass loss, potentiodynamic polarization technique and electrochemical impedance spectroscopy measurements at ambient temperature. The investigation results indicate that the Schiff Bases compounds with an average efficiency of 92% at 1.0mM of additive concentration have fairly effective inhibiting properties for mild steel in hydrochloric acid, and acts as mixed type inhibitor character. The inhibition efficiencies measured by all measurements show that the inhibition efficiencies increase with increase in inhibitor concentration. This reveals that the inhibitive mechanism of inhibitors were primarily due to adsorption on mild steel surface, and follow Langmuir adsorption isotherm. The temperature effect on the inhibition process in 1MHCl with the addition of investigated Schiff bases was studied at a temperature range of 30-60°C, and the activation parameters (Ea, ΔH and ΔS) were calculated to elaborate the corrosion mechanism. The differences in efficiency for two investigated inhibitors are associated with their chemical structures.

Keywords: Corrosion inhibition; EIS; Kinetic parameters; Mild steel; SEM; Schiff bases.