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Inhibition of Aluminium Corrosion Using <i>Carica papaya</i> Leaves Extract in Sulphuric Acid
Department of Materials and Energy Science & Engineering, Nelson Mandela African Institution of Science and Technology, Arusha, Tanzania
Department of Materials and Energy Science & Engineering, Nelson Mandela African Institution of Science and Technology, Arusha, Tanzania
Department of Water and Environmental Science and Engineering, Nelson Mandela African Institution of Science and Technol-ogy, Arusha, Tanzania
- 1 Department of Materials and Energy Science & Engineering, Nelson Mandela African Institution of Science and Technology, Arusha, Tanzania
- 2 Department of Materials and Energy Science & Engineering, Nelson Mandela African Institution of Science and Technology, Arusha, Tanzania
- 3 Department of Water and Environmental Science and Engineering, Nelson Mandela African Institution of Science and Technol-ogy, Arusha, Tanzania
Journal of Minerals and Materials Characterization and Engineering·Volume 06 (2017)·Pages 1–14·Published 25 December 2017·DOI10.4236/jmmce.2018.61001
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Abstract
Inhibition of aluminium corrosion using <i> C. papaya </i> leaves extract in 1.0 M H <sub>2</sub> SO <sub>4</sub> was investigated by using gravimetric analysis at various concentrations and temperatures: 303 K, 313 K and 323 K. Characterization was done by using Scanning Electron Microscope (SEM) and Fourier Transform Infrared (FT-IR) spectroscopy. Results show that, inhibiting ability of the extract was due to its adsorption onto the metal surface through Langmuir adsorption isotherm. Thermodynamic (Gibbs energy, entropy and heats of adsorption) and kinetic parameters (activation energy and entropy of activation) were also determined. All of these agreed to physical adsorption of inhibitor onto the aluminium surface.
KeywordsC. <i>papaya</i>InhibitionAluminiumSulphuric AcidAdsorptionThermodynamic and Kinetic Parameters
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