Effective corrosion inhibition of mild steel in acidic medium using inexpensive kermes natural dye: experimental and quantum chemical study

Abstract

Purpose The purpose of this paper is to test the Natural Kermes dye (NKD) as a cheap and stable corrosion inhibitor for mild steel in 1.0 M HCl and its adsorption mechanism on the steel surface. Design/methodology/approach The inhibition action of NKD was studied using AC impedance, potentiodynamic polarization, scanning electron microscope (SEM) and UV-visible spectra techniques complemented with quantum study. Findings Here, the authors show that addition of NKD inhibits effectively the corrosion of steel in HCl solution via its adsorption on the steel surface. The inhibition efficiency of NKD increases with increase in its concentration and decreases with temperature. Potentiodynamic results revealed that NKD acts as a mixed–type inhibitor. Thermodynamic parameters for corrosion and adsorption process were obtained from the experimental data. Moreover, the experimental inhibition efficiencies were correlated with the electronic properties of NKD using density functional theory. Originality/value To the best of the authors’ knowledge, this is the first report showing the effect of NKD on the corrosion inhibition of steel.

A new insight into corrosion inhibition process of mild steel in sulfuric acid medium: a combined experimental and theoretical study

“…Furthermore, triazoles have exhibited conspicuous advantages with nonvolatile, wide applicable temperatures and environmentally friendly properties. In chemical aspects, the use of inhibitors has been considered as the economical strategies for protecting metals against corrosion (Niu et al, 2005;Prasanna et al, 2016;Finšgar and Jackson, 2014;El Boraei et al, 2018), the major part of a potentially successful corrosive inhibitors are organic compounds that contain heteroatoms such as oxygen, nitrogen or sulfur, as well as p -electrons of aromatic rings in their molecular structures, considered as strong adsorption sites, being the inhibition increases in the sequence (O < N<S) (Finsgar and Merl, 2014;Doner et al, 2011;Hejazi et al, 2015;Yuce et al, 2014;Ramesh et al, 2005;Fuhua et al, 2011;Bentiss et al, 2005;Bouklah et al, 2004). Several substituted triazole compounds have been considered and discussed as good inhibitors in various corrosive environments due to their planar molecular structure that enable their adsorption on the metallic surface through the nitrogen lone electron pairs (El Ashry et al, 2006;Wang, 2006;Chikh et al, 2005;Wang et al, 2004;Bentiss et al, 2003;Tamilselvi and Rajeswari, 2003;El Mehdi et al, 2003;Wang et al, 2003).…”

Use of Experimental Designs to Evaluate the Influence of Methyl Green Dye as a Corrosion Inhibitor for Carbon Steel in Perchloric Acid

“…The study of corrosion process and its inhibition by organic compounds, such as dyes, is a very active field of research in acidic or basic environments [7][8][9][10][11][12][13]. Dyes have long been applied in the coloring, printing, paper, leather, textile, plastics, cosmetic, medical, pharmaceutical, and agri-food industries, and in recent times as corrosion inhibitors of metals and alloys in aggressive environments [14,15].…”

Glycerol and malonic acid as corrosion inhibitors seen through the density functional theory perspective

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