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Corrosion Induced on Aluminum by Biodiesel Components in Non-Oxygen Environments
Fabiola Vergara-Juarez1, Jesus Porcayo-Calderon2, Juan Pablo Perez-Orozco1
1Tecnológico Nacional de México/Instituto Tecnológico de Zacatepec, Departamento de Ingeniería Química y Bioquímica, Calzada Tecnológico 27, Zacatepec de Hidalgo 62780, Morelos, Mexico.
Materials (Basel, Switzerland)
|April 27, 2024
Summary
Biodiesel's fatty acid methyl esters (FAMEs) impact aluminum corrosion. Unsaturated FAMEs, containing C=C bonds, form a protective layer, reducing corrosion compared to saturated FAMEs.
Area of Science:
- Materials Science
- Electrochemistry
- Corrosion Engineering
Background:
- Biodiesel composition, specifically fatty acid methyl esters (FAMEs), influences the corrosion of metal storage containers.
- The presence of carbon-carbon double bonds (C=C) in FAMEs is a key factor affecting aluminum corrosion.
- Understanding FAMEs' role in corrosion is crucial for ensuring the integrity of biodiesel storage systems.
Purpose of the Study:
- To investigate the effect of C=C bonds in FAMEs on aluminum corrosion in an oxygen-free environment.
- To compare the corrosion behavior of saturated (Methyl Stearate) and unsaturated (Methyl Oleate, Methyl Linoleate) FAMEs on aluminum.
- To analyze the protective mechanisms offered by unsaturated FAMEs against aluminum corrosion.
Main Methods:
- Mass loss assays were conducted at 100, 200, and 280 °C for 1000 hours using pure Methyl Stearate (MS) and MS with unsaturated FAMEs (MS-5% MO, MS-5% ML).
- Chemical analysis of FAMEs involved FTIR, TGA, and GC/MS; surface analysis of aluminum used SEM/EDS.
- Electrochemical techniques (potentiodynamic polarization, LPR, EIS) assessed aluminum corrosion induced by thermal-degraded FAME products in aqueous extracts.
Main Results:
- Higher corrosion rates were observed for pure Methyl Stearate (MS) compared to unsaturated methyl ester mixtures.
- SEM/EDS analysis characterized the aluminum surfaces and their chemical composition after exposure.
- Electrochemical tests showed that thermal degradation products from unsaturated FAMEs formed a thicker passive layer on aluminum than those from pure MS.
Conclusions:
- Unsaturated FAMEs, due to their C=C bonds, offer better corrosion protection to aluminum than saturated FAMEs.
- The thermal degradation products of unsaturated FAMEs play a significant role in forming a protective passive layer on aluminum surfaces.
- Biodiesel composition management is essential for mitigating aluminum corrosion in storage applications.
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