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Corrosion of Ferrous Alloys by Organic Compounds in Simulated Bio-Oils

Biomass-derived oils have gained considerable interest as a renewable energy source to decrease use of fossil fuels. These bio-oils often contain organic compounds that can be corrosive to ferrous alloys used for pipelines and storage tanks. It is therefore important to assess corrosivity of organic compounds in bio-oils and identify ferrous alloys with sufficient corrosion resistance. In this work 16 organic compounds selected on the basis of analyses of commercial bio-oils were used to formulate simulated bio-oil solutions that contained single or two organic species with total concentrations up to 0.2 molal. Type 410 430 316L and 201 stainless steels as well as 2.25Cr-1Mo steel were evaluated using Electrochemical Impedance Spectroscopy (EIS) to assess their corrosion resistance. For type 410 0.1 molal lactobionic acid was considerably more corrosive than other organic species. Catechol and formic acid were also highly corrosive to type 410 and the mixtures of the two were used to test the other steels. Type 201 was more corrosion-resistant than type 410 in formic acid and catechol + formic acid solutions. However in catechol solution the corrosion resistance of type 201 and 410 was quite similar. The 2.25Cr-1Mo steel exhibited the least corrosion-resistance in these solutions as expected given its low alloy content. Currently EIS-based corrosivity measurements are being conducted for type 316L. The outcome of this work will provide guidance on the selection of appropriate structural materials for bio-oil production transport and processing systems. This research was sponsored by the U.S. Department of Energy Bioenergy Technologies Office.

Product Number: 51319-12895-SG
Author: Jiheon Jun
Publication Date: 2019
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