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Electrochemical corrosion tests in an environment of low-conductive ethanol-gasoline blends: Part 1 – Testing of supporting electrolytes
Journal of Electroanalytical Chemistry ( IF 4.5 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.jelechem.2020.114879
Lukáš Matějovský , Martin Staš , Karolina Dumská , Milan Pospíšil , Jan Macák

Abstract Bioethanol is a promising biofuel that can be used in the pure form or in the form of ethanol-gasoline blends (EGBs) as a transportation fuel. The combustion of bioethanol in petrol engines is associated with several problems, with bioethanol corrosion effects on metallic construction engine parts being one of the most serious ones. Electrochemical methods, such as electrochemical impedance spectroscopy, measurement of polarization characteristics (Tafel scan), etc., have been found to be efficient in studying corrosion effects in metal-EGB systems. However, a fuel environment with a low ethanol content (such as E10 and lower) has low conductivity, which can be a limiting factor for electrochemical corrosion studies. Supporting electrolytes can be used to increase the conductivity of such environments. These supporting electrolytes must be inert against the occurring corrosion reactions in order not to negatively affect the obtained corrosion data. In this work, we tested four potential supporting electrolytes (lithium perchlorate, tetrabutylammonium tetrafluoroborate, potassium hexafluorophosphate, and tetrabutylammonium bromide) to be used for the electrochemical corrosion tests on mild steel in the environment of an E85 fuel. In our study, we demonstrated that tetrabutylammonium tetrafluoroborate (TBATFB) can successfully be used for short-term corrosion studies as it exhibited minimum effects on the obtained electrochemical data even at a relatively high concentration of about 500 mg/L. The use of this supporting electrolyte can substantially facilitate electrochemical corrosion studies in less conductive media such as EGBs with a low content of ethanol.

中文翻译:

低导电乙醇-汽油混合物环境中的电化学腐蚀测试:第 1 部分 – 支持电解质的测试

摘要 生物乙醇是一种很有前景的生物燃料,可以以纯形式或以乙醇-汽油混合物 (EGB) 的形式用作运输燃料。生物乙醇在汽油发动机中的燃烧与几个问题有关,其中生物乙醇对金属结构发动机零件的腐蚀影响是最严重的问题之一。电化学方法,如电化学阻抗谱、极化特性测量(塔菲尔扫描)等,已被发现在研究金属-EGB 系统中的腐蚀效应方面是有效的。然而,乙醇含量低(如 E10 及更低)的燃料环境具有低电导率,这可能是电化学腐蚀研究的限制因素。支持电解质可用于增加此类环境的电导率。这些支持电解质必须对发生的腐蚀反应呈惰性,以免对获得的腐蚀数据产生负面影响。在这项工作中,我们测试了四种潜在的支持电解质(高氯酸锂、四氟硼酸四丁基铵、六氟磷酸钾和溴化四丁基铵),用于在 E85 燃料环境中对低碳钢进行电化学腐蚀测试。在我们的研究中,我们证明四丁基四氟硼酸铵 (TBATFB) 可成功用于短期腐蚀研究,因为即使在约 500 mg/L 的相对较高浓度下,它对获得的电化学数据的影响也最小。
更新日期:2021-01-01
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