Electrochemical corrosion study of carbon steel in bio-oil environments

Haoxiang Wang and Jing Liu

Renewable Energy, 2024, vol. 221, issue C

Abstract: Comprehensive corrosion risk assessments are essential for ensuring the safe and efficient utilization of bio-oil (BO) in industrial applications. In this study, electrochemical measurements (EMs) such as potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) were conducted for carbon steel (CS) at BO storage temperatures of 20 and 50 °C. Different electrolytes were used, including BO, BO+10 wt% methanol (10 ME), BO+20 wt% methanol (20 ME), and 0.1 M acetic acid (0.1AC). To improve data quality in low-conductive environments, various techniques were employed for EMs. Concurrent immersion experiments (IEs) were performed to validate corrosion rate (CR) calculations obtained from EMs. The PDP results revealed uniform corrosion as the prevalent form of CS corrosion in BO environments, while EIS measurements indicated the involvement of adsorption/chelation processes. A well-fit equivalent circuit model was proposed for EIS data. The ratios between CRs obtained from EMs and IEs were around 4.3 and 0.9 at 20 and 50 °C, respectively, for all electrolytes, confirming the reliability of EMs for evaluating CS corrosion in BO environments. This study provides valuable insights into corrosion assessments of structural alloys in BO environments using reliable yet inexpensive EM techniques.

Keywords: Bio-oil; Carbon steel; Corrosion; Potentiodynamic polarization (PDP); Electrochemical impedance spectroscopy (EIS) (search for similar items in EconPapers)
Date: 2024
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:221:y:2024:i:c:s096014812301738x

DOI: 10.1016/j.renene.2023.119823

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