Article

Inhibition of Mild Steel Corrosion in Hydrochloric and Sulfuric Acid Media Using a Thiosemicarbazone Derivative

Punita MouryaDepartment of Applied Chemistry, Indian Institute of Technology, Banaras Hindu University, Varanasi 221005, IndiaSitashree BanerjeeDepartment of Applied Chemistry, Indian Institute of Technology, Banaras Hindu University, Varanasi 221005, IndiaRashmi B. RastogiDepartment of Applied Chemistry, Indian Institute of Technology, Banaras Hindu University, Varanasi 221005, IndiaMadan Mohan SinghDepartment of Applied Chemistry, Indian Institute of Technology, Banaras Hindu University, Varanasi 221005, India

2013en

ABI

Abstract

The inhibitive effect of 4-(N,N-dimethylamino)benzaldehyde thiosemicarbazone (DMABT) on the corrosion of mild steel (MS) in 1 N HCl and 1 N H2SO4 solutions was investigated by weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopic measurements. It is inferred on the basis of the obtained results that DMABT is a mixed-type inhibitor, predominantly retarding cathodic reaction in both acidic media through adsorption on a MS surface. Adsorption obeys Langmuir's adsorption isotherm in both acidic media. The observations regarding energy-dispersive X-ray, scanning electron microscopy, and atomic force microscopy confirm the existence of a protective film of the inhibitor on a MS surface. The molecular adsorption of DMABT was ascertained by density functional theory data.

Identifiers

DOI: 10.1021/ie4012497

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