Electrochemical and Adsorption Studies of 4-Chloro,8-(Trifluoromethyl)Quinoline (CTQ) for Mild Steel in Acidic Medium
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TECHNICAL ARTICLE—PEER-REVIEWED
Electrochemical and Adsorption Studies of 4-Chloro,8-(Trifluoromethyl)Quinoline (CTQ) for Mild Steel in Acidic Medium Narayana Hebbar . B. M. Praveen . B. M. Prasanna . P. Vishwanath
Submitted: 5 February 2020 ASM International 2020
Abstract In the present study, corrosion behavior of mild steel in the presence of 4-chloro,8-(trifluoromethyl)quinoline (CTQ) was experimentally investigated. Investigator conducted the experiments using electrochemical methods such as polarization and electrochemical impedance techniques at 303–333 K. The obtained results suggested that CTQ is a good corrosion inhibitor for mild steel in 1 M hydrochloric acid medium. The CTQ adsorbed over metal surface obeys Langmuir adsorption isotherm. The thermodynamic parameters such as DG0ads, DH0ads, DS0ads were measured. The relationship between temperature and corrosion rate was explained by activation parameters. Keywords CTQ Inhibitor SEM Polarization Weight loss
Introduction Mild steel is a major alloy of iron which has enormous applications. The mild steel is used in fertilizer industries, petrochemical industries, pharmaceutical industries and other chemical industries. But mild steel deteriorates in the N. Hebbar (&) P. Vishwanath Department of Chemistry, Sri Dharmasthala Manjunatheshwara College (Autonomous), Ujire, Karnataka 574240, India e-mail: [email protected] B. M. Praveen Department of Chemistry, Srinivas University College of Engineering and Technology, Mangalore, Karnataka 574146, India B. M. Prasanna Department of Chemistry, Jain Institute of Technology, Davanagere, Karnataka 577033, India
presence of moisture and oxygen. In the presence of acid solution and alkaline and salt solution, it undergoes corrosion. It reduces the service life of metals/alloys, which results in the economic burden for all types of industries. Therefore, prevention of corrosion is very important to avoid the burden. There are many corrosion control methods. Among all methods, corrosion inhibition technique is one of the economic and effective methods for controlling corrosion in acidic media [1]. Most of the well-known acid inhibitors are organic compounds containing nitrogen, sulfur and oxygen atoms. In acidic solutions, transition of metal/solution interface is attributed to the adsorption of the inhibitor molecules at the metal/solution interface, forming a protective film. The rate of adsorption is usually rapid, and hence, the reactive metal surface is shielded from the acid solutions [2]. The adsorption of corrosion inhibitor depends mainly on physicochemical properties of the molecule such as functional groups, steric factor, molecular size, molecular weight, molecular structure, aromaticity, electron density at the donor atoms, p-orbital character of donating electrons and electronic structure of the molecule [3–7]. Therefore several organic inhibitors have reported as inhibitor [8–14] have been reported as good inhibitors. The planarity of the molecule, besides other factors, decides the
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