Corrosion of 316L stainless steel in ionic liquid working fluids used for absorption heat pumps or refrigerators

• Published in: Corrosion engineering, science, and technology Vol. 48; no. 5; pp. 388 - 394
• Main Authors: Yuan, X L, Zhang, X D, Li, X L, Fan, H Q, Zhao, Z C
• Format: Journal Article
• Language: English
• Published: London, England Taylor & Francis 01.08.2013; SAGE Publications; Maney; Taylor & Francis Ltd
• Subjects: Applied sciences; Aqueous solutions; Austenitic stainless steels; Corrosion; Corrosion behaviour; Corrosion environments; Electrochemical impedance spectroscopy; Electrochemical technique; Electrolytes; Exact sciences and technology; Heat resistant steels; Ionic liquids; Metals. Metallurgy; Quantum chemistry; Scanning electron microscopy; SEM; Stainless steel; Stainless steels; Working fluids; Corrosion behaviour; Ionic liquids; SEM; Quantum chemistry; Electrochemical technique; Austenitic stainless steel; Scanning electron microscopy; Absorption; Corrosion; Stainless steel; Pump; Stainless steel-316L
• ISSN: 1478-422X; 1743-2782
• DOI: 10.1179/1743278213Y.0000000094

The corrosion behaviour of 316L stainless steel (316L ss) in aqueous solutions of ionic liquid 1-ethyl-3-methylimidazolium diethylphosphate ([EMIM][DEP]) with different contents of water was investigated by scanning electron microscopy (SEM), potentiodynamic polarisation and electrochemical impedance spectroscopy (EIS). The results indicate that 316L in aqueous solutions of ionic liquid [EMIM][DEP] shows an obvious surface passivation, a broad passive region and low corrosion current densities. It also has better corrosion resistivity than in 0⋅177 M LiBr aqueous electrolytes. Furthermore, in order to explain the corrosion mechanism in two working fluids, the Van der Waals volume of ions and the interaction energies of ion pairs were calculated based on the density functional theory (DFT) in quantum chemistry combined with gradient corrected functional using Gaussian 09.