Corrosion inhibition of sulphate-reducing bacterial by Ag/Cu bimetallic nanoparticles synthesised from ginger extract

The growth of sulphate-reducing bacteria (SRB) in oilfield produced water and resistance to antibiotics has become an important issue for safe and clean production. Bimetallic nanomaterials with antibacterial effects are a potential candidate to confront microbial resistance. Environmentally friendly methods for the synthesis of bimetallic nanomaterials are an important factor to be considered in production. This study proposed a green method to synthesise Ag/Cu bimetallic nanoparticles (BNPs) as novel corrosion inhibitors and biocides using ginger rhizome extracts. The results showed that 6.25 μg mL-1 BNPs synthesised from ginger extract could disrupt the integrity of SRB cells and reduce adhesion on the surface of carbon steel over 65%. The corrosion rate of BNPs-treated SRB cultures on carbon steel was verified by weight tests, decreasing from 0.453 mm⋅a-1 to 0.05 mm⋅a-1. he changes of carbon steel surface morphology and SRB cell structure after BNPs treatment were observed in order to illustrate the inhibition mechanism of BNPs. The corrosive inhibitors prepared by this method have potential in inhibiting the corrosion behaviour of SRBs and are expected for applications in oilfield production for pipeline corrosion protection.