Biomass derived pyrolysis oil is a promising renewable energy source. Due to the variety of biomass feedstocks, the bio-oils could contain a wide range of organic constituents which would provide unique corrosive environments for structural materials. A preliminary work exposed different classes of steels and stainless steels to selected organic constituents of biomass pyrolysis oils and found that corrosion susceptibility, assessed using electrochemical impedance spectroscopy (EIS), was prominent in the steels with Cr lower than 11 wt.%. Although this result suggests stainless steels will resist corrosion by certain organic constituents, it may not be sufficient to predict the corrosion performance in real bio-oils. Therefore, this study attempted electrochemical measurements on Cr-alloyed steels and stainless steels directly exposed to a biomass derived pyrolysis oil. To overcome the low conductivity of bio-oils, a customized Luggin capillary was designed to minimize the ohmic path in bio-oils. The results of this work will be reported.

Subject
Constituents, Electrochemical impedance spectroscopy, Corrosion resistant alloys, Composition, Stainless alloys, Impedance, Steel, Immersion, Sulfides, Corrosion resistance, Stainless steel, Inclusions, Oil
Keywords:
biomass pyrolysis oil, stainless steels, bio-oil storage, Electrochemical Impedance Spectroscopy, corrosion
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2021
Association for Materials Protection and Performance (AMPP)
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