Matějovský Lukáš, Macák Jan, Pleyer Olga, Straka Petr, Staš Martin
Department of Petroleum Technology and Alternative Fuels, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic.
Department of Power Engineering, University of Chemistry and Technology Prague, Technická 3, 166 28 Prague 6, Czech Republic.
ACS Omega. 2019 May 17;4(5):8650-8660. doi: 10.1021/acsomega.8b03686. eCollection 2019 May 31.
Ethanol produced from renewable sources (i.e., bioethanol) is a first-generation biofuel that is currently being added as a biocomponent into gasolines. Mixtures of ethanol and gasoline are designated as ethanol-gasoline blends (EGBs). Ethanol has high polarity and moisture affinity, which considerably influence the properties of the resulting EGBs including their aggressiveness to many metallic and nonmetallic materials. The corrosion aggressiveness of EGBs can be minimized by suitable corrosion inhibitors. In this study, we tested three different corrosion inhibitors on mild steel in the environment of aggressive E10, E25, E60, and E85 fuels. The inhibitors tested were diethylene triamine (DETA) and two mixed inhibitors containing propargyl alcohol, dibenzyl sulfoxide, and octadecyl amine. To study the efficiency of the corrosion inhibitors, we used static and dynamic corrosion tests and electrochemical measurements including impedance spectroscopy and potentiodynamic polarization. The highest corrosion aggressiveness on mild steel was observed for the E60 fuel. The highest inhibitory efficiency was, for all the fuels tested, observed for the DETA inhibitor. For the DETA concentration of 100 mg·L, the inhibitory efficiency in the E60 fuel was determined to be around 98%.
由可再生资源生产的乙醇（即生物乙醇）是第一代生物燃料，目前正作为生物组分添加到汽油中。乙醇和汽油的混合物被称为乙醇 - 汽油混合燃料（EGBs）。乙醇具有高极性和吸湿性，这对所得EGBs的性能有很大影响，包括它们对许多金属和非金属材料的腐蚀性。通过合适的缓蚀剂可以将EGBs的腐蚀活性降至最低。在本研究中，我们在腐蚀性较强的E10、E25、E60和E85燃料环境中，对低碳钢测试了三种不同的缓蚀剂。测试的缓蚀剂是二乙烯三胺（DETA）和两种含有炔丙醇、二苄基亚砜和十八烷基胺的混合缓蚀剂。为了研究缓蚀剂的效率，我们使用了静态和动态腐蚀试验以及电化学测量，包括阻抗谱和动电位极化。在E60燃料中观察到对低碳钢的腐蚀性最强。对于所有测试燃料，观察到DETA缓蚀剂的缓蚀效率最高。对于100 mg·L的DETA浓度，在E60燃料中的缓蚀效率约为98%。
