Loading...

The Effect of Olive Leaf Green Inhibitor on the Corrosion Resistance of Steel Reinforcement in Geopolymer Concrete Pore Solution

Khalili, Mohammad Reza | 2023

71 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56800 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Afshar, Abdollah; Hosseini, Payam
  7. Abstract:
  8. In this research project, the aim was to investigate the potential of olive leaf extract as an eco-friendly inhibitor for enhancing the corrosion resistance of reinforcing steel in simulated geopolymer concrete pore solution (GCP) containing chloride ions. The inhibitory effects of olive leaf extract were evaluated using various electrochemical techniques as well as scanning electron microscopy. The main phenolic compounds present in olive leaf extract were identified using high performance liquid chromatography (HPLC). Moreover, the elements and chemical bonds present in the surface passive film of the steel bar immersed in the olive leaf inhibiting system were characterized using attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS). The electrochemical results exhibited that the olive leaf extract was a highly effective corrosion inhibitor, with a corrosion inhibition efficiency of 98% in reducing chloride-induced corrosion. The optimal dosage of the inhibitor was found to be 1 gram dry per liter of simulated geopolymer pore solution, which increased the chloride threshold values ([Cl-]/[OH-]) of steel electrodes from 1.5 to 3. The results of potentiodynamic polarization, ATR-FTIR, and XPS analyses revealed that the olive leaf extract acted as a mixed-type corrosion inhibitor, improving the corrosion resistance of carbon steel mainly by forming a carbonaceous organic film that inhibited both the cathodic and anodic corrosion reactions. Furthermore, the adsorption behavior of olive leaf extract conforms to the Langmuir adsorption isotherm
  9. Keywords:
  10. Corrosion ; Green Corrosion Inhibitor ; Olive Leaf Extract ; Geopolymer Concrete ; High Performance Liquid Chromatography ; Corrosion Resistance ; Pore Solution ; Steel Reinforcement

 Digital Object List

 Bookmark

No TOC