Metal Corrosion and the Efficiency of Corrosion Inhibitors in Less Conductive Media

Matějovský, Lukáš; Macák, Jan; Pleyer, Olga; Staš, Martin

doi:10.3791/57757

Cited by 8 publications

(56 citation statements)

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“…Then, the sample surface was degreased with acetone and ethanol and then dried freely or using a pulp tissue. 56…”

Section: Experimental Sectionmentioning

confidence: 99%

“…This testing method is suitable for several applications including (i) the fast prediction of fuel aging, (ii) testing the changes in fuel quality, and (iii) testing the fuel influence on metallic and nonmetallic materials. 56…”

Section: Experimental Sectionmentioning

confidence: 99%

“…Diagram of the laboratory flow apparatus for dynamic testing: (1) tempering silicon bath, (2) frit for air supply, (3) preheating spiral, (4) air inlet, (5) sample hook, (6) overflow into the storage flask, (7) storage flask, (8) cooler, (9) cryostat, (10) peristaltic pump, (11) thermometer. Adapted with permission from ref (56). Copyright 2018 MyJove Corporation.…”

Section: Experimental Sectionmentioning

confidence: 99%

“…The inhibitor efficiency can be evaluated according to the following equations (see eqs 5a–5c)where E f is the inhibitor efficiency in %, R p is the polarization resistance of the material, and ν Pm is the corrosion rate of the material in a metal–fuel system; i corr —see eq 4; the indices i and 0 describe the system with and without the inhibitor, respectively. 56…”

Section: Experimental Sectionmentioning

confidence: 99%

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Efficiency of Steel Corrosion Inhibitors in an Environment of Ethanol–Gasoline Blends

et al. 2019

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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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“…Then, the sample surface was degreased with acetone and ethanol and then dried freely or using a pulp tissue. 56…”

Section: Experimental Sectionmentioning

confidence: 99%

Section: Experimental Sectionmentioning

confidence: 99%

Section: Experimental Sectionmentioning

confidence: 99%

Section: Experimental Sectionmentioning

confidence: 99%

See 2 more Smart Citations

Efficiency of Steel Corrosion Inhibitors in an Environment of Ethanol–Gasoline Blends

et al. 2019

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“…Conversely, electrochemical methods typically have higher demands on experimental equipment, but they are time-efficient and can provide more information about the ongoing corrosion processes. 27 Open-circuit potential (OCP) measurements, 14,20,21 electrochemical impedance spectroscopy (EIS), 9,10,18,19 or polarization characteristics measurements, 15,22 such as cyclic potentiodynamic polarization (CPP), 17,19,20,22 are examples of the electrochemical methods applicable for the corrosion studies of AGBs. Several studies have been carried out to describe the effects of chlorides, water, pH, and the dissolved oxygen content in ethanol and EGBs on the corrosion of low-alloy steel and aluminum alloys using CPP in a three-electrode arrangement.…”

Section: Introductionmentioning

confidence: 99%

Cyclic Potentiometric Polarization and Resistance of Mild Steel in an Environment of Alcohols and Their Blends with Gasoline

2019

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Nowadays, there is an effort to increase the more widespread use of biofuels that are a renewable energy source in transportation and an alternative to conventional, petroleum-based fuels. These biofuels include alcohols such as biomethanol, bioethanol, and biobutanol that have a high octane number, but generally different physical and chemical properties than petroleum fuels. The different properties of alcohols may cause low material compatibility with carbon steel. Here, we used cyclic potentiodynamic polarization (CPP) to study the behavior of carbon steel in an environment of alcohols and alcohol–gasoline blends (AGBs). Using CPP, we proved that the corrosion of mild steel can be significantly influenced by alcohol properties, such as the chain length, pKa, and solubility of oxygen and water. In the environment of pure alcohols (not blended by gasoline), a very good passivation ability of steel was proven, especially for n-butanol. In AGBs, steel corrosion can also be influenced by the gasoline amount. When these pure alcohols or their gasoline blends are contaminated by water-containing chlorides and organic acids, the corrosion rate of carbon steel can increase by up to 4 orders of magnitude. In an anhydrous environment of alcohols, the CPP can give results with a very good informative value.

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Electrochemical Study of Mild Steel Resistance in Butanol–Gasoline and Ethanol–Gasoline Blends

et al. 2021

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This work deals with studying mild steel corrosion resistance in ethanol–gasoline and butanol–gasoline blends (EGBs and BGBs, respectively) with an alcohol content of 10–100 vol %. These fuels were tested in two forms: pure (noncontaminated) and purposely contaminated with water and trace amounts of acids, chlorides, and sulfate ions. Electrochemical methods, such as open circuit potential, electrochemical impedance spectroscopy, and polarization characteristics measurements in three-electrode arrangements were used for the study. A three-month-long static immersion test was performed as a supplementary method. The obtained results showed that the contamination led to an increase in aggressiveness of the tested fuels against the mild steel. This effect was surprisingly more noticeable for the BGBs, in which the corrosion rate increased by up to 3 orders of magnitude compared with their noncontaminated form. For the EGBs with an ethanol content of 60 vol % or more (E60 and higher), an initial quasi-passive state was observed, which was not persistent. Pitting corrosion was observed especially in the E100 fuel and in the fuels containing 40 vol % or more of butanol (B40 and higher). The E10 and B10 fuels showed very low corrosion aggressiveness even after the contamination. In the B10 fuel, the lowest mild steel corrosion rates were measured, which corresponded to the lowest corrosion current densities (3.6 × 10–3 μA cm–2) and the highest polarization resistance (13.7 MΩ cm2).

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Metal Corrosion and the Efficiency of Corrosion Inhibitors in Less Conductive Media

Cited by 8 publications

References 0 publications

Efficiency of Steel Corrosion Inhibitors in an Environment of Ethanol–Gasoline Blends

Efficiency of Steel Corrosion Inhibitors in an Environment of Ethanol–Gasoline Blends

Cyclic Potentiometric Polarization and Resistance of Mild Steel in an Environment of Alcohols and Their Blends with Gasoline

Electrochemical Study of Mild Steel Resistance in Butanol–Gasoline and Ethanol–Gasoline Blends

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