Inhibitive effect of diethylcarbamazine on the corrosion of mild steel in hydrochloric acid

doi:10.1016/j.corsci.2009.12.011

Corrosion Science

Volume 52, Issue 4, April 2010, Pages 1529-1535

https://doi.org/10.1016/j.corsci.2009.12.011 Get rights and content

Abstract

Potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), weight loss measurements and atomic force microscopy techniques were used to investigate the inhibitory effect of diethylcarbamazine (DECM) on corrosion of mild steel in HCl solution. The inhibitor showed >90% inhibition efficiency at 5.01 × 10⁻⁴ M. Results obtained revealed that inhibition occurs through adsorption of inhibitor molecules on metal surface without modifying the mechanism of corrosion process. Potentiodynamic polarization studies suggested that it is a mixed type inhibitor, predominantly controls cathodic reaction. Activation parameters ( $E_{a}$ , $Δ H$ and $Δ S$ ) and thermodynamic parameters ( $Δ G_{ads}^{o}$ , $Δ H_{ads}^{o}$ and $Δ S_{ads}^{o}$ ) were calculated to investigate mechanism of inhibition.

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.

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Short CommunicationInhibitive effect of diethylcarbamazine on the corrosion of mild steel in hydrochloric acid

Abstract

Introduction

Section snippets

Material preparation

Effect of inhibitor concentration

Conclusion

Acknowledgement

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Short Communication
Inhibitive effect of diethylcarbamazine on the corrosion of mild steel in hydrochloric acid