Sustainable Development of Palm Oil: Synthesis and Electrochemical Performance of Corrosion Inhibitors

Abstract

Palm oil production is among the highest worldwide, and it has been mainly used in the food industry and other commodities. Currently, a lot of palm oil production has been destined for the synthesis of biodiesel; however, its use in applications other than the food industry has been questioned. Thereby for a sustainable development, in this paper the use of palm oil of low quality for corrosion inhibitors synthesis is proposed. The performance of the synthesized inhibitors was evaluated by using electrochemical techniques such as open circuit potential measurements, linear polarization resistance and electrochemical impedance spectroscopy. The results indicate that the fatty amides from palm oil are excellent corrosion inhibitors with protection efficiencies greater than 98%. Fatty amides molecules act as cathodic inhibitors decreasing the anodic dissolution of iron. When fatty amides are added, a rapid decrease in the corrosion rate occurs due to the rapid formation of a molecular film onto carbon steel surface. During the adsorption process of the inhibitor a self-organization of the hydrocarbon chains takes place forming a tightly packed hydrophobic film. These results demonstrate that the use of palm oil for the production of green inhibitors promises to be an excellent alternative for a sustainable use of the palm oil production.

Biodiesel from “Morelos” Rice: Synthesis, Oxidative Stability, and Corrosivity

“…From the phase angle spectrum, it is possible to observe only part of the characteristic shape (Gauss bell shape) of the phase angle corresponding to one single time constant. However, the width of this time constant suggests that there are actually two overlapping time constants which evolve from the high frequency region to the intermediate frequency region; something similar has been reported when an oily film is adsorbed by the metal surface [54][55][56][57]59]. Therefore, the response observed in the region of high frequency (>1000 Hz, phase angle maximum practically constant and close to 90 ∘ ) represents the capacitive response of biodiesel, and that observed in the intermediate frequency region (10-1000 Hz, phase angle maximum variable) is due to the corrosion process in the steel-biodiesel interface [60].…”

“…However, due to the high resistivity of biodiesel, it is not obvious to associate such response with the corrosion processes at the metal-electrolyte interface [20]. However, despite this, the analysis of the Bode diagram can differentiate the capacitive response of biodiesel from the response of the stainless steel corrosion process [54][55][56][57][58]. From the phase angle spectrum, it is possible to observe only part of the characteristic shape (Gauss bell shape) of the phase angle corresponding to one single time constant.…”

Sustainable Development of Corrosion Inhibitors from Electronic Scrap: Synthesis and Electrochemical Performance

“…ese time constants are not visible in the Nyquist diagram because the rst two constants evolve from the high frequency region to the intermediate frequency region. is is very common in corrosion processes where organic inhibitors adsorb onto the metal surface forming protective lms [30][31][32]; in the Nyquist diagrams, only about 30% of the collected data is visible, and generally, 30% corresponds to data from the low frequency region. In the high-frequency region, the formation and evolution of the rst time constant around 10,000 Hz with a maximum phase angle of approximately 25°is observed.…”

Use of an imidazol synthetized from palm oil as a corrosion inhibitor for a supermartensitic stainless steel in H2S

“…However, due to serious environmental concerns, in the last few years there has been a big interest for the called "green inhibitors" which includes extracts from plants which also contain heteroatoms and are non toxic, environmentally friendly, non-hazardous, cheaper and readily available. Many of these naturally-occurring inhibitors have been extracted from essential oils contained in plants (21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31). Thus, Asmaa and El-Dougdoug ( 21) extracted an amido poly amine surfactant from the Melia azedarach seeds oil and used it as a corrosion inhibitor for carbon steel in 2.0M HCl by using potentiodynamic polarization curves and electrochemical impedance spectroscopy.…”