Abstract
The chemical/microbial bio-corrosion in water pipelines are the most common problem in industry worldwide which cause damage to expensive equipment and increases the maintenance costs. In this work, the green synthesis of nanocomposite was synthesized using brown algae (Sargassum muticum) extract. This method is eco-friendly and non-toxic. The synthesized nanocomposite was characterized using UV–vis spectroscopy, Dynamic light scattering (DLS), X-ray diffraction (XRD), Transmission electron microscopy (TEM) and FTIR analysis. The size of ZnO and CuO nanoparticles was reduced to 15nm and 20 nm respectively, after exposure to 60Co gamma-ray irradiation. The nanocomposite showed significant P-value (P<0.001) as a biofilm inhibitor and anti-adherence for Proteus mirabilis, Pseudomonas aeruginosa and Staphylococcus aureus, which were represented bio-corrosion index. The results of weight loss method showed that Proteus mirabilis caused the highest bio-corrosion rate (1.5 mpy) on mild steel coupon as examined by SEM. The nanocomposite prevented the adhesion of biofilm bacteria to carbon mild steel coupon which was confirmed by SEM examination. Finally, the nanocomposite showed highest anti-corrosion efficacy in 1M HCl at 150 ppm with high anti-corrosion efficiency (92.3%). The results of this study concludes that the green synthesized nanocomposite has multi-function to be used as anti-bacterial, anti-biofilm, anti-corrosion and anti-bio corrosion.
Highlights
Carbon mild steel C1010 is a preferred construction material in many industrial and domestic applications, including oil and gas pipelines, due to its good mechanical and chemical properties (Palazzo, 2016)
A biofilm formed by aerobic Pseudomonas aeruginosa encourages the formation of a locally oxygen free shelter that enhances the growth of sulfate-reducing bacteria (SRB) in an open-air system (Gu et al, 2019)
Nanocomposites were established excellent antibacterial activity depending on the nanoparticle size as this parameter changes the surface area that leads to better interaction with bacterial cells (Wang et al, 2017)
Summary
Carbon mild steel C1010 is a preferred construction material in many industrial and domestic applications, including oil and gas pipelines, due to its good mechanical and chemical properties (Palazzo, 2016). Biofilm extracellular polysaccharide substance has sticky properties that aid the adherence to metal surfaces and protect bacterial elimination by biocides subsequently causing corrosion (Aruliah and Ting, 2014). To diminish the problem of corrosion either chemical or microbial, corrosion inhibitors are one of the common treatments This includes cathodic, anodic protection, and surface treatments (Wei et al, 2013; Yeole et al, 2015). Biological approach possesses non-toxic and cheap method compared to chemical synthesis approach They express active chemical groups (e.g., NH2, CO, and CHO) which are adsorbed on the metal surface to stimulate protection (Wang et al, 2006; Agarwal et al, 2017). The nanocomposite was designed to have multifunction (anti-biofilm, anti-adherence, and anti-corrosion/biocorrosion) to protect mild steel from bio-corrosion and corrosion in acidic media
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