ALOE VERA AS A GREEN CORROSION INHIBITOR FOR PROTECTION OF METALS AND ALLOYS-A REVIEW
DOI:
https://doi.org/10.4314/jfas.1384Keywords:
Corrosion inhibition, Aloe vera, Weight loss, Electrochemical methods, SEMAbstract
Corrosion is the deterioration of a metal by a chemical attack or reaction with its environment. Aloe vera has the ability to control the corrosion of various metals and alloys, such as aluminum, carbon steel, mild steel, stainless steel, iron, zinc, copper and bronze. Various techniques like the weight loss (WL) method and electrochemical methods such as potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS), have been used to evaluate the corrosion inhibition efficiency (I.E.) of Aloe vera. The protective film has been analyzed by Fourier-transform infrared spectroscopy (FT-IR), UV-visible spectroscopy, scanning electron microscopy (SEM), and energy dispersive X-ray spectrometry (EDX) methods. Adsorption of Aloe vera on metal surfaces obeys the Langmuir, Al-Ewady, Frumkin, Freundlich, or Temkin isotherms, depending on the nature of metal and the corrosive environment. A polarization study reveals that Aloe vera can function as an anodic, cathodic, or mixed type of inhibitor.
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