Short CommunicationInhibitive effect of diethylcarbamazine on the corrosion of mild steel in hydrochloric acid
Introduction
Mild steel is widely used as the constructional material in many industries due to its excellent mechanical properties and low cost. The main problem of mild steel is its dissolution in acidic solutions. Corrosion inhibitors are widely used to prevent or minimized metal dissolution in acid solution. Most of the commercial inhibitors are toxic in nature, therefore, their replacement by environmentally benign inhibitors is necessary. Recently, a few non-toxic compounds such as ceftriaxone, tryptamine, succinic acid, l-ascorbic acid, sulphamethaxazole, cefatraxyl, streptomycin, cefalexin, cefotaxime sodium, doxycycline mebendazole, cefazolin, etc. have been investigated as corrosion inhibitors by our research group [1], [2], [3], [4], [5], [6], [7] and other investigators [8], [9], [10], [11], [12], [13].
In the present work, we have investigated DECM (diethylcarbamazine) as corrosion inhibitors for mild steel in HCl solution using weight loss, EIS, Tafel polarization and AFM techniques. The survey of literature reveals that it is a non-toxic compound (Ld-50 is 560 mg/kg in mice and 395 mg/kg in rats) [14]. It is being used as corrosion inhibitor for the first time.
Diethylcarbamazine is the commercial name of 4-methyl-N, N-bis(4-methylpiperazin-2-yl) – piperazine-1-carboxamide. It is an anthelmintic drug and does not contain any toxic metallic elements.
Section snippets
Material preparation
The mild steel coupons having composition (wt.%): C = 0.17, Mn = 0.46, Si = 0.26, S = 0.017, P = 0.019 and balance Fe were used for weight loss measurement and of size 1.0 × 1.0 cm (exposed) with a 7.5 cm long stem (isolated with commercially available lacquer, OPI PRODUCTSNSN: 853000N068480, Company’s Name: OPI PRODUCTS INC.) were used for electrochemical measurements. The mild steel samples were abraded with emery paper of 600, 800, 1000 and 1200 grades, washed thoroughly with double distilled water,
Effect of inhibitor concentration
Table 1 showed the values of inhibition efficiencies and corrosion rates obtained from weight loss measurements in absence and presence of different concentrations of DECM in 1 M HCl after 3 h immersion at 308 K. It follows from the data of Table 1 that the weight loss decreased (i.e., corrosion rate is suppressed), and therefore, the corrosion inhibition strengthened, with increase in inhibitor concentration. This trend may result from adsorption and surface coverage increases with the increase
Conclusion
- 1.
The inhibition efficiency of DECM increases with increase in concentration of inhibitor.
- 2.
The inhibitor showed maximum inhibition efficiency at 5.01 × 10−4 M.
- 3.
Langmuir adsorption isotherm and impedance studies showed that DECM inhibits corrosion of mild steel through adsorption mechanism.
- 4.
Potentiodynamic polarization proved that diethylcarbamazine is a mixed type predominantly cathodic inhibitor.
Acknowledgement
One of the authors Ashish Kumar Singh is thankful to University Grant Commission, New Delhi, for Senior Research fellowship.
References (46)
- et al.
Corros. Sci.
(2010) - et al.
Corros. Sci.
(2009) - et al.
Mater. Lett.
(2009) - et al.
Corros. Sci.
(2004) - et al.
Mater. Chem. Phys.
(2004) - et al.
Mater. Chem. Phys.
(2004) Mater. Chem. Phys.
(1999)Corros. Sci.
(2008)Corros. Sci.
(2004)- et al.
Corros. Sci.
(2008)
Corros. Sci.
Mater. Chem. Phys.
Corros. Sci.
Corros. Sci.
Corros. Sci.
Corros. Sci.
Corros. Sci.
Corros. Sci.
Corros. Sci.
Corros. Sci.
Mater. Chem. Phys.
Prog. Org. Coat.
Mater. Lett.
Cited by (141)
Study of new phosphorus-sulfur epoxy polymer for CS anticorrosion in HCl solution: Experimental and theoretical investigations
2024, Materials Science and Engineering: BEvaluation of an aza dipyrromethene derivative as a green corrosion inhibitor via experimental and theoretical methods
2023, Journal of Molecular LiquidsSynthesis of Ce, N co–doped carbon dots as green and effective corrosion inhibitor for copper in acid environment
2022, Journal of the Taiwan Institute of Chemical EngineersNatural ligands: Promising ecofriendly alternatives for corrosion protection and plethora of many prospects
2022, Process Safety and Environmental Protection