低电导率乙醇-汽油混合物的电化学腐蚀试验：支持电解质在受污染的 E5 和 E10 燃料中的应用,ACS Omega

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低电导率乙醇-汽油混合物的电化学腐蚀试验：支持电解质在受污染的 E5 和 E10 燃料中的应用
ACS Omega ( IF 3.7 ) Pub Date : 2021-06-25 , DOI: 10.1021/acsomega.1c02320
Lukáš Matějovský ₁ , Martin Staš ₁ , Jan Macák ₂

Affiliation

乙醇基 E5 和 E10 燃料已广泛用作汽油发动机中的汽车燃料。然而，特别是当受到污染时，这些燃料会对某些发动机结构部件（如低碳钢）产生腐蚀作用。因此，对低碳钢耐蚀性的研究就显得尤为重要。电化学方法如电化学阻抗谱 (EIS) 和极化特性测量 (Tafel scan-TS) 被证明在研究乙醇-汽油混合物 (EGB) 中的低碳钢腐蚀行为方面非常有价值。然而，到目前为止，这些方法的使用对于低乙醇含量的 EGB，如 E5 和 E10，由于其低电导率而非常有限。在这项研究中，我们基于使用 500 mg/L 的四丁基四氟硼酸铵 (TBATFB) 作为支持电解质提出了改进的 EIS 和 TS 腐蚀测量。这种修改导致受污染的 E5 和 E10 燃料的电导率增加，这使我们能够成功地进行电化学腐蚀测试。腐蚀电流密度确定为 1.5 × 10测试的 E5 和 E10 燃料分别为^–3和 1.5 × 10 ^–2 μA/cm ²。这些改进的方法为 EGB 中钢腐蚀研究的电化学测试设备提供了重要的扩展。它们可以让人们获得关于正在发生的腐蚀过程的即时信息，从而估计材料在腐蚀环境中的寿命，并可能有助于防止腐蚀。

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Electrochemical Corrosion Tests in Low-Conductivity Ethanol–Gasoline Blends: Application of Supporting Electrolyte for Contaminated E5 and E10 Fuels

Ethanol-based E5 and E10 fuels have extensively been used as automotive fuels in gasoline engines. However, especially when contaminated, these fuels can exhibit corrosion effects on some engine construction parts such as mild steel. Thus, the study of mild steel corrosion resistance has become of the utmost importance. Electrochemical methods such as electrochemical impedance spectroscopy (EIS) and polarization characteristics measurements (Tafel scan—TS) were proven to be very valuable in studying the mild steel corrosion behavior in ethanol–gasoline blends (EGBs). However, the use of these methods was, so far, very limited for low-ethanol-content EGBs such as E5 and E10 due to their low conductivity. In this study, we present modified EIS and TS corrosion measurements based on the use of tetrabutylammonium tetrafluoroborate (TBATFB) at 500 mg/L as a supporting electrolyte. This modification led to an increase in the contaminated E5 and E10 fuels’ conductivity, which allowed us to successfully perform the electrochemical corrosion tests. The corrosion current densities were determined to be 1.5 × 10^–3 and 1.5 × 10^–2 μA/cm² for the tested E5 and E10 fuels, respectively. These modified methods present a significant extension of an electrochemical testing apparatus for steel corrosion studies in EGBs. They can allow one to obtain instantaneous information about the occurring corrosion process and, thus, estimate the materials’ lifetime in corrosive environments and potentially help to prevent corrosion.

更新日期：2021-07-13

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