Abstract
Tea tree extract, containing antioxidant constituents α-terpineol, terpinen-4-ol, and α-terpinene, has a wide range of applications in the cosmetic, food, and pharmaceutical industries. In this study, tea tree extract showed an anticorrosive effect under 1 M HCl solution on mild steel (MS) and 304 stainless steel (STS). Uniform corrosion for MS and pitting corrosion for STS at 298 K were retarded, with inhibition efficiencies of 77% and 86%, respectively. The inhibition of uniform and pitting corrosion was confirmed by scanning electron microscopy and laser scanning confocal microscopy in terms of surface roughness and pitting morphologies. The most effective constituent contributing to the inhibitory performance of tea tree extract was revealed to be α-terpineol, with an inhibition efficiency of 83%. The adsorption of tea tree extract was confirmed by surface characterization analysis using Fourier transform infrared spectroscopy, Raman spectroscopy, and Electrochemical impedance spectroscopy. Interestingly, G- and D-peaks of Raman spectra were detected from the inhibited steels, and this finding is the first example in the corrosion inhibition field. The anticorrosion mechanism can be explained by the formation of organic-Fe complexes on the corroded steel surface via electron donor and acceptor interactions in the presence of an oxygen atom of the hydroxyl group or ether of organic inhibitors.
Highlights
IntroductionThe adsorption layer acts as a physical barrier between the steel surfaces and the corrosive environment to provide effective protection against corrosion [1,2,3,4,5]
The decrease in IEWL at the raised temperature may be attributed to the desorption of tea tree extract from the steel surface and/or the increase in the reaction activity of corrosive ions on the unprotected surface [21,22]
This study showed tea tree extract as a green promising corrosion inhibitor to substitute chemically synthesized compounds
Summary
The adsorption layer acts as a physical barrier between the steel surfaces and the corrosive environment to provide effective protection against corrosion [1,2,3,4,5]. This phenomenon has been applied to restrain the internal corrosion of steel pipelines and the unexpected dissolution of steel structures during the acidizing process; the corrosion life of steel can be extended by a corrosion inhibitor [6]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
