High temperature corrosion in various grades of vegetable and waste oils used for bio-fuel production

• Published in: Corrosion science Vol. 206; p. 110501
• Main Authors: Andari, Fouad, Kittel, Jean, Fernandes, Joana, Godin, Nathalie, Ter-Ovanessian, Benoit, Ropital, François
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.09.2022; Elsevier
• Subjects: A. Low alloy steel; A. Stainless steel; B. Weight loss; C. Acid corrosion; C. High temperature corrosion; Catalysis; Chemical Sciences; Environmental Sciences; C. High temperature corrosion; A. Low alloy steel; C. Acid corrosion; A. Stainless steel; B. Weight loss; Acid corrosion; Low alloy steel; Stainless steel; High temperature corrosion; Weight loss
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2022.110501

Corrosion experiments were conducted at 220 °C in vegetable and waste oils used to produce biofuels. Industrial oils and model solutions with controlled concentrations of free fatty acids (FFA) were used. Corrosion of carbon steel and low alloy steel increased with FFA concentration up to several millimeters per year. AISI 316 L stainless steel was immune to corrosion in all FFA concentrations used in this study. Test solution analysis with various techniques allowed identifying corrosion mechanisms involving consumption of FFAs and the formation of highly soluble metal complexes. [Display omitted] •Corrosion tests on stainless steel, low alloy steel, and carbon steel are carried out at 220 °C in vegetable and waste oils.•AISI 316L presents perfect corrosion resistance in all test solutions.•For carbon and low alloy steels, linear correlations are obtained between the oil’s initial acidity and corrosion rate.•Corrosion mechanism involves direct reaction with free fatty acids and the formation of organo-metallic complexes.