Mitigation of eco‐unfriendly and costly microbial induced corrosion using novel synthesized Schiff base cationic surfactants

Abstract

BACKGROUND Sulfate‐reducing bacteria (SRB) are considered to be the major cause of microbial‐induced corrosion. It contributes to many environmental and other costly industrial problems in the petroleum industry. Thus there is always a great need for producing new efficient biocides and biocorrosion inhibitors. RESULTS In this work, three Schiff base surfactants (coded Q12, Q14 and Q18) were synthesized and characterized using Fourier transform infrared and 1H‐nuclear magnetic resonance techniques. A mixed culture of SRB was collected from an oil field production tank located at the North Bahrya Petroleum Company (NORPETCO), Egypt. The antimicrobial effect of the newly synthesized surfactants was studied against sessile and planktonic SRB over their different growth phases by various methods: viable cell count via most probable number method, estimation of biogenic sulfide concentrations, weight loss of iron coupons in microbial growth medium and biofilm examination on coupon surfaces using scanning electron microscopy. The synthesized surfactants expressed a high inhibition effect on bacterial growth, recording a minimum inhibitory concentration of 750 mg L−1 for Q18 and 1000 mg L−1 for both Q12 and Q14, with a considerable decline in biogenic sulfide productivity from a dose of 500 mg L−1 until complete suppression at a dose of 1000 mg L−1. Also the synthesized surfactants showed an effective metal corrosion inhibition at a concentration of 500 mg L−1. CONCLUSION Schiff base cationic surfactants with long hydrophobic chains can be recommended as biocorrosion inhibitors for industrial application in the petroleum sector. © 2020 Society of Chemical Industry (SCI)

Corrosion Behavior on 20# Pipeline Steel by Sulfate-Reducing Bacteria in Simulated NaCl Alkali/Surfactant/Polymer Produced Solution

“… 47 The strong complexation of metal cations by EPS could promote the anodic dissolution of the metal. 48 The adsorption of HPAM and SPS on the carbon steel surface was affected by the formation of the biofilm, and SEM images also revealed large differences in the amount of corrosion products in different regions. Hence, after 4 days of immersion, the R ct decreased rapidly, and the corrosion rate of carbon steel increased accordingly.…”

“…SRB under anaerobic conditions can reproduce in large numbers, and a large number of metabolites (EPS, corrosion products, and some organic or inorganic substances) on the metal surface are produced through their own metabolic activities. , Electroactive enzyme molecules in EPS can act as electron carriers to transfer electrons from pipeline steel to O 2 , which promoted the cathodic reaction of the electrochemical reaction . The strong complexation of metal cations by EPS could promote the anodic dissolution of the metal . The adsorption of HPAM and SPS on the carbon steel surface was affected by the formation of the biofilm, and SEM images also revealed large differences in the amount of corrosion products in different regions.…”

Case Study: The Application of metagenomics as a diagnostic tool for microbiologically influenced corrosion in an Egyptian oilfield

“…Customized experiments were used for studying microbial corrosion. For this purpose, Kobisy et al investigated novel synthesized Schiff base cationic surfactants in order to mitigate microbial corrosion using different culture-dependent techniques [7].…”

“…Further studies have shown that hydrogenotrophic methanogens may contribute to biocorrosion [6]. The mitigation of microbial corrosion in the site under study by using a novel synthesized Schiff-based surfactant has been studied by the authors in another work [7], However, more information is required to reveal the mechanism of microbiologically in uenced corrosion (MIC) in industries employing corrosive materials to acquire complete knowledge.…”