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.

中文翻译：

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Cr-Mo钢和铁素体不锈钢在生物质热解油成分中的腐蚀敏感性

为了更好地理解和评估用于生产，运输和储存生物质热解油的候选结构钢和铁素体不锈钢的腐蚀性能，对生物油的选定有机成分（包括邻苯二酚，甲酸及其混合物）进行了腐蚀研究。以及乳糖酸，使用电化学阻抗谱。通过将测得的阻抗谱拟合到等效电路中，可以得到抗腐蚀反应的电阻R ₂。R ₂的值然后用于评估每种有机成分和混合物中钢的耐腐蚀性。410和430型不锈钢在所有测试的有机成分中均具有耐腐蚀性能，而2.25Cr-1Mo钢则不能。9Cr-1Mo钢在邻苯二酚中耐腐蚀，但在其他包含有机酸的混合物中则不耐腐蚀。根据这项工作的结果，建议对有机酸的耐腐蚀性归因于形成了富铬钝化膜，该钝化膜要求临界Cr含量超过约11 wt％的不锈钢。在仅邻苯二酚的溶液中，较低的Cr中间水平出现在2.25Cr-1Mo钢和9Cr-1Mo钢之间就足够了。