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Electrochemical Corrosion Analysis Of Stainless Steels In LALM Pyrolysis Bio-Oil With Organic Corrodents

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Biomass-derived pyrolysis oils (bio-oils) are recognized as a renewable energy source that could
aid in the reduction of fossil fuel use. Bio-oils exhibit higher corrosivity to common ferrous alloys because the oils contain organic acids and water. A series of corrosion studies were previously performed to determine the corrosion rates of ferrous alloys exposed in bio-oils for a quantitative evaluation of the material compatibility. The key information from these previous studies is that ferrous alloys with more Cr, Ni, and Mo are needed for compatibility with bio-oils.

Product Number: 51322-17759-SG
Author: Jiheon Jun, Dino Sulejmanovic, James R. Keiser, Michael P. Brady, Michael D. Kass
Publication Date: 2022
Industries: Science of Corrosion , Corrosion Monitoring and Control , Coatings
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Pyrolysis bio-oils are corrosive to low alloy steels, e.g., 2.25Cr-1Mo, 5Cr-1Mo, and 9Cr-1Mo
grades. To identify the alloys with sufficient bio-oil compatibility, several commercial stainless
steels were examined in bio-oil using electrochemical impedance spectroscopy to semi
quantitatively assess their corrosion resistance. Low-Ash Low-Moisture (LALM) bio-oil, produced
from a forest residue feedstock by the National Renewable Energy Laboratory in Golden, CO,
was used as a test liquid for electrochemical impedance spectroscopy measurements. Three
organic corrodents, formic acid, catechol, and lactobionic acid, were added into LALM bio-oil to
produce test liquids with intentionally increased corrosivity. Corrosion reaction resistance,
determined from the impedance data, was used to evaluate the corrosion compatibility of each
stainless steel in LALM bio-oil and LALM bio-oil + organic corrodent(s). The results from corrosion
reaction resistance indicated that the critical Cr content of stainless steels for corrosion resistance
would be greater than 14 wt % if Ni and Mo contents are low but can be as low as 12–13 wt %
with appreciable amounts of Ni and Mo.

Pyrolysis bio-oils are corrosive to low alloy steels, e.g., 2.25Cr-1Mo, 5Cr-1Mo, and 9Cr-1Mo
grades. To identify the alloys with sufficient bio-oil compatibility, several commercial stainless
steels were examined in bio-oil using electrochemical impedance spectroscopy to semi
quantitatively assess their corrosion resistance. Low-Ash Low-Moisture (LALM) bio-oil, produced
from a forest residue feedstock by the National Renewable Energy Laboratory in Golden, CO,
was used as a test liquid for electrochemical impedance spectroscopy measurements. Three
organic corrodents, formic acid, catechol, and lactobionic acid, were added into LALM bio-oil to
produce test liquids with intentionally increased corrosivity. Corrosion reaction resistance,
determined from the impedance data, was used to evaluate the corrosion compatibility of each
stainless steel in LALM bio-oil and LALM bio-oil + organic corrodent(s). The results from corrosion
reaction resistance indicated that the critical Cr content of stainless steels for corrosion resistance
would be greater than 14 wt % if Ni and Mo contents are low but can be as low as 12–13 wt %
with appreciable amounts of Ni and Mo.

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Product Number: 51322-17625-SG
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