Ginger extract as green biocide to control microbial corrosion of mild steel

Jayaraman Narenkumar,Aruliah Rajasekar,Kadarkarai Murugan,Ayyakkannu Usha Raja Nanthini,Giovanni Benelli,Punniyakotti Parthipan

doi:10.1007/s13205-017-0783-9

Jayaraman Narenkumar, Aruliah Rajasekar + Show 4 more

Open Access

https://doi.org/10.1007/s13205-017-0783-9

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Abstract

In latest years, various techniques and chemicals have been used for the control of microbial influenced corrosion (MIC) of metals. The application of botanical-based biocides is one of the effective and practical techniques in the fight against MIC. In the present study, the role of aqueous extract of ginger (Zingiber officinale) (GIE) as green biocide to control MIC of mild steel 1010 (MS) in a cooling water system was investigated. Biocorrosion behavior of Bacillus thuringiensis EN2 on MS and its control by GIE was analyzed by electrochemical measurements. Polarization, electrochemical studies (ES), weight loss measurements (WL), and surface analysis (XRD, X-ray diffraction spectroscopy, and FTIR, Fourier transform infra-red spectroscopy) were performed under various incubation periods up to 4 weeks. We observed that EN2 forms a thick biofilm on the MS metal surface at the end of the incubation period and the WL significantly increased to 993 mg at fourth week when compared to the initial immersion period (194 ± 2 mg). In contrast, with addition of GIE, WL was reduced about 41 ± 2 mg over biotic system (993 ± 2 mg). GC–MS analysis confirmed the adsorption of active component of GIE (β-turmerone) on the metal surface as a protective layer to prevent the biofilm formation and thus leads to reduction of corrosion. The optimum 20 ppm of GIE was found to be effective corrosion inhibition efficiency which was about 80%. From the results of WL, ES, XRD, FTIR, and GC–MS, GIE was identified as biocide and thus inhibits the bacterial growth on MS metal surface and it leads to control MIC. XRD showed that the GIE with EN2 resulted in less formation of corrosion products over biotic and abiotic systems. Overall, this research first shed light on the antibacterial activity of GIE inhibiting biofilm formation, thus reducing the corrosion of MS in cooling water systems.

Highlights

Cooling towers are commonly used for heat transfer from circulating water to the environment
Kim and Park (2013) reported and stated that GIE not affected the growth of bacteria; this may be due to the removal of active compounds affecting PA14 bacteria growth by the extraction procedure of GIE
The aqueous extraction of GIE inhibited the bacterial growth on mild steel 1010 (MS) surface. 20 ppm of GIE was recognized as a dosage having significant antibacterial activity

Summary

Introduction

Cooling towers are commonly used for heat transfer from circulating water to the environment. A major problem in cooling tower water system is material corrosion due to the presence of water and bacterial biofilms formation (Aquaprox 2009). EPS are important metabolites for biofilm formation on metallic and non-metallic surfaces (Liu et al 2007). Microbial influenced corrosion (MIC) in cooling tower water system is favored during certain environmental conditions leading to biofilm formation on metal/non-metal surfaces, such as high humidity and high doses of chloride The mild steel is an important metal used in construction industry, due to its cost-effectiveness. It has low corrosion resistance in aqueous and non-aqueous environments, if compared to other metallic materials (El-Shamy et al 2009). Recent research focused on controlling the corrosion of mild steel using corrosion inhibitors biocides (Amin and Ibrahim 2011)

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