Resumo

ROMAN, Alejandra S; MENDEZ, Claudia M  e  ARES, Alicia E. Corrosion Rates Evaluation of Stainless Steels in Soy Biodiesel Using Different Techniques. Rev. cienc. tecnol. [online]. 2018, n.29, pp.27-34. ISSN 1851-7587.

In the present research we studied the behavior against corrosion of four stainless steels in soy biodiesel at room temperature. The stainless steels used were AISI 304L, AISI 316, Sea Cure-1 and 2205. The corrosion velocities were measured by applying electrochemical tests and weight loss methods. The electrochemical studies conducted were potentiodynamic polarization curves, measurement of the open circuit potential as a function of time, and Electrochemical Impedance Spectroscopy (EIS) measurements. In addition, gravimetric tests were performed according to ASTM G 31-72.The four stainless steels showed low corrosion rates being steel 2205 the one which always showed the lowest value. This indicates that the materials studied are suitable for use in contact with biodiesel obtained from soy oil. The agreement obtained in the results by applying different methods allows us to conclude that the electrochemical techniques are suitable to evaluate corrosion rates in soy biodiesel.

Palavras-chave : Biodiesel; Corrosion; Stainless steels; Linear polarization; Gravimetric tests; Electrochemical Impedance Spectroscopy (EIS).

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