Natural Sweet Almond Oil as an Effective Green Inhibitor for Aluminum Corrosion in Sulfuric Acid Medium
M. Abdallah, M. Alfakeer, Mubark Alshareef, H. Hawsawi, Salih S. Al‐Juaid, Reda Abdel‐Hameed, M. Sobhi
Abstract
Natural sweet almond oil (SA oil) was inspectedd as a safe and green inhibitor for the corrosion of aluminum (Al) in 1.0 M H2SO4 solution. The protection efficacy of SA oil was detected from mass loss, geometric hydrogen evolution reaction, potentiodynamic polarization and electrochemical impedance spectroscopy techniques. All the corrosion parameters gained from these techniques emphasize the good inhibiting action of SA oil. The outcomes demonstrates that the protection efficacy rises with rising the doses of SA oil and decline temperature. It is reached to 93.62 % at 450 ppm of SA oil. The protection process is explicated by the adsorption of SA oil on the Al surface according to Langmuir isotherm. The polarization method classifies this oil as a mixed type and mainly anodic (βa > βc). The adsorption of SA oil onto the Al surface is spontaneous due to the negative values of ΔGads.From the impact of temperature, the activation and adsorption thermodynamics functions were computed and interpreted.