Abstract
To better understand and evaluate the corrosion performance of candidate structural steels and ferritic stainless steels for production, transport, and storage of biomass pyrolysis oils, corrosion studies were conducted in selected organic constituents of bio-oils, including catechol, formic acid, and their mixtures as well as lactobionic acid, using electrochemical impedance spectroscopy. R2, the resistance against corrosion reaction, was obtained by fitting measured impedance spectra into an equivalent circuit. The values of R2 were then used to assess corrosion resistance of the steels in each organic constituent and mixture. Type 410 and 430 stainless steels were resistant to corrosion in all tested organic constituents, while 2.25Cr-1Mo steel was not. 9Cr-1Mo steel was corrosion resistant in catechol but not in the other mixtures that contained organic acids. On the basis of the results of this work, it is suggested that the corrosion resistance against organic acids is attributed to formation of a Cr-rich passive film that requires stainless steels with critical Cr levels in excess of approximately 11 wt %. In catechol-only solution, lower levels of Cr intermediate between that of 2.25Cr-1Mo steel and 9Cr-1Mo steel appeared sufficient.
Original language | English |
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Pages (from-to) | 6220-6228 |
Number of pages | 9 |
Journal | Energy and Fuels |
Volume | 34 |
Issue number | 5 |
DOIs | |
State | Published - May 21 2020 |
Funding
This research was sponsored by the U.S. Department of Energy, Bioenergy Technologies Office. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. Tianshu Li at Fontana Corrosion Center, The Ohio State University, helped the authors to improve this paper with his careful review. Dr. Dino Sulejmanovic at Oak Ridge Nation Laboratory (ORNL) also helped with preparation of testing solutions for additional EIS measurements. Bruce Pint, Rishi Pillai, and Marie Romedenne provided their review to improve this paper. Tracie Lowe and Victoria Cox at ORNL assisted in the preparation of alloy specimens and metallographic analysis.