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
–1
, the inhibitory efficiency in the E60 fuel was determined
to be around 98%.
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