article · Chemical and Biochemical Engineering Quarterly
Damage caused by corrosion prompts an ongoing search for effective protective materials. This research evaluates leaf extracts of Carpobrotus acinaciformis as plant-based corrosion inhibitors for C1020 carbon steel immersed in hydrochloric acid. Both aqueous and methanolic extracts were prepared and examined using electrochemical tests, including polarization curves and electrochemical impedance spectroscopy. Furthermore, the extracts were evaluated for antimicrobial and antifungal properties against four bacterial strains and one yeast species. Chemical and surface characterisation techniques revealed that the inhibition efficiency rises alongside extract concentration. The methanolic extract reached 96.36 percent efficiency at 350 parts per million, whereas the water extract achieved 94.73 percent efficiency at 450 parts per million. Microscopic imaging confirmed reduced surface degradation, showing these extracts to be effective, eco-friendly inhibitors and antimicrobial agents in acidic settings.
Industrial infrastructure made of carbon steel degrades quickly when exposed to acidic conditions, leading to equipment failure and costly replacements. Finding natural, plant-derived alternatives to harsh chemical inhibitors offers a safer, more sustainable way to control metal degradation. These extracts also provide antimicrobial protection, offering a dual-action approach for protecting materials from both chemical breakdown and biological growth.
This work points towards green inhibitor formulations for industries that operate steel infrastructure in acidic environments, such as chemical processing and acid-cleaning sectors. Potential users include industrial maintenance providers and manufacturers of corrosion protection additives. Based on laboratory-scale extraction, surface imaging, and electrochemical testing, the technology is at an early research stage and requires further scale-up and industrial validation before commercial adoption.
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Corrosion causes significant damage to materials and equipment, prompting the search for effective inhibitors. This study investigates the use of Carpobrotus acinaciformis (CA) leaf extracts as alternative corrosion inhibitors for C1020 carbon steel in hydrochloric acid (HCl). Two extraction methods were employed: aqueous (denoted as CAW) and methanolic (denoted as CAM) extracts of Carpobrotus acinaciformis leaves. Electrochemical characterization, including polarization curves and electrochemical im pedance spectroscopy (EIS), was conducted to evaluate the corrosion inhibition efficiency of the extracts. Additionally, antimicrobial and antifungal activities were assessed against four bacterial strains and one yeast species. Surface and chemical analyses, performed using UV-vis spectroscopy, FTIR, and SEM, demonstrated that the inhibition efficiency (IE) increased with higher inhibitor concentrations. The CAM extract exhibit ed an inhibition efficiency (IE) of 96.36 % at 350 ppm, while the CAW extract achieved 94.73 % IE at 450 ppm. FTIR analysis identified key functional groups, such as hydroxyl and carbonyl, while SEM analysis confirmed the reduction in corrosion. These findings suggest that CAM and CAW extracts are effective, eco-friendly corrosion inhibitors and antimicrobial agents for C1020 carbon steel in an acidic environment.
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DOI: 10.15255/cabeq.2024.2397
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