CORROSION RATES EVALUATION OF STAINLESS STEELS IN SOY BIODIESEL USING DIFFERENT TECHNIQUES

ALEJANDRA S. ROMAN; CLAUDIA M. MÉNDEZ; ALICIA E. ARES

REVISTA DE CIENCIA Y TECNOLOGíA

CENTRO DE INVESTIGACIÓN Y DESARROLLO TECNOLÓGICO, FACULTAD DE CIENCIAS EXACTAS, QUÍMICAS Y NATURALES, UNIVERSIDAD NACIONAL DE MISIONES

Lugar: Posadas; Año: 2018 vol. 29 p. 27 - 34

0329-8922

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