Influence of Ethanol, Acidity and Chloride Concentration on the Corrosion Resistance of AISI 316L Stainless Steel

Ferreira, Elivelton Alves; Noce, Rodrigo Della; Fugivara, Cecilio Sadao; Benedetti, Assis Vicente

doi:10.5935/0103-5053.20130052

Cited by 3 publications

(5 citation statements)

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“…When 316L stainless steel was exposed to either aqueous solution or a mixture of 35 wt % water and 65 wt % ethanol, both containing 1 wt % H 2 SO 4 and 0.35 wt % NaCl, it was shown that the presence of ethanol inhibited steel dissolution, as evidenced by an increase in the corrosion potential. 12 In solution consisting of the ethanol-water mixture (without acid) and 1.70 wt % NaCl, the corrosion and pitting potentials were similar to those obtained in aqueous solution. The oxide film formed potentiodynamically on the electrode surface presented similar resistivity in both aqueous solutions and ethanol-water mixture containing 1.70 wt % NaCl.…”

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“…The polarization curves obtained for 316L stainless steel, in aqueous solution and in a mixture of 65 wt % ethanol, 35 wt % water, both containing 1 wt % H 2 SO 4 and 0.35 wt % NaCl, showed that the presence of ethanol caused inhibition of steel dissolution, as evidenced by an increase in E corr . 12 Additionally, Elsener et al, 19 who also showed that in solutions containing the mixture of ethanol/water/0.5 mol L À1 HCl, with different water concentrations, 304 stainless steel presented an active-passive transition that was strongly dependent on the solution water content.…”

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confidence: 99%

“…The oxide film formed potentiodynamically on the electrode surface presented similar resistivity in both aqueous solutions and ethanol-water mixture containing 1.70 wt % NaCl. 12 According to Anna, 13 corrosion-protection principles, as they are known from corrosion in aqueous solutions, are not applicable in solving materials problems; organic solvents differ from aqueous ones in their physicochemical and chemical properties. Sekine et al 14 studied the corrosion behaviour of stainless steel in aqueous ethanol solution containing sulphuric acid.…”

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Evaluation of 316L Stainless Steel Corrosion Resistance in Solution Simulating the Acid Hydrolysis of Biomass

Ferreira

Noce

Fugivara

et al. 2011

J. Electrochem. Soc.

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The corrosion resistance of 316L stainless steel in 65 wt % ethanol, 35 wt % water, 1 wt % H 2 SO 4 solution containing different NaCl concentrations and at different temperatures was investigated using open circuit potential measurements, polarization curves, and electrochemical impedance spectroscopy. At 25 C, the minimum NaCl concentration required for occurrence of pitting was 0.58 wt %. In 0.35 wt % NaCl solution, localized corrosion was observed at temperatures higher than 40 C and, depending on the potential, metastable or stable pits were observed. No pits were observed below 40 C in 0.35 wt % NaCl solution. Stainless steels are used as construction materials for key corrosion-resistant equipment in most of the major industries, and especially in chemical, petroleum, processing, and power generation plants. A very thin film, known as the passive film, which is selfhealing in a wide variety of environments, 1-4 provides their corrosion resistance. Due to environmental concerns, there has recently been an increase in the demand for ethanol as a road vehicle fuel. There is therefore, a greater need for studies of the corrosion resistance of materials used in alcohol production plants, and in transportation and storage facilities.Among these stainless steels, the 300 series stands out. The 300 series represents compositional modifications of the classic 18=8 (18% Cr-8% Ni) stainless steel, which has been a popular corrosion-resistant material for some 70 years, to improve pitting, crevice and stress corrosion resistance, high-temperature oxidation resistance and strength, and reduce intergranular corrosion in welded materials. Type 304 is the general-purpose grade, widely used in applications requiring a good combination of corrosion resistance and formability. On the other hand, type 316 contains molybdenum and has greater resistance than type 304 to pitting in marine and chemical industry environments. and pitting corrosion constitutes one of the most important failure mechanisms. Pits cause failure through perforation, and engender stress corrosion cracks.1 Pitting corrosion has been studied for the last few decades and, according to Frankel,6 fundamental studies have focused on characterization of the passive film, the initial stages of passive film breakdown, metastable pitting growth, and the growth of large and stable pits.Solution chloride concentration is a very important parameter influencing pitting formation on stainless steels. Increasing the chloride concentration significantly increases the possibility of pitting. The chloride levels that can be tolerated without the onset of pitting increase with the chromium and molybdenum contents of austenitic and ferritic stainless steels (for example, the minimum chloride ion concentration in 1 mol L À1 H 2 SO 4 for initiation of pitting on pure Fe is 0.3 mmol L À1, while on Fe-18.6Cr-9.9Ni alloy it is 0.1 mol L À1). 1Electrochemical studies of pitting corrosion have found the existence characteristic potentials. Stable pits form at potentials noble to t...

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Section: Resultsmentioning

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Evaluation of 316L Stainless Steel Corrosion Resistance in Solution Simulating the Acid Hydrolysis of Biomass

Ferreira

Noce

Fugivara

et al. 2011

J. Electrochem. Soc.

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“…Otherwise, a common defect of experiment in researches in low-ethanol-content solutions is the use of mass fractions as the unit for concentration of contents, which causes the fluctuation activity of contents like chloride since the density of solutions differs with the concentration of ethanol. Ferreira et al recorded the electrochemical impede spectra (EIS) of 316L in 1 wt.% H 2 SO 4 and 0.35 wt.% NaCl solutions with and without ethanol to prove that the passive film of stainless steel was decayed by ethanol (Ferreira et al, 2013 ), which should have been the influence of the higher effective concentration of H + and Cl − .…”

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confidence: 99%

Influence of Ethanol on Pitting Corrosion Behavior of Stainless Steel for Bioethanol Fermentation Tanks

et al. 2020

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The role of ethanol (C 2 H 5 OH) in pitting corrosion behavior of AISI 316L austenitic stainless steel was investigated in aqueous ethanolic solution with chloride. The pitting susceptibility and surface morphology of 316L in a series of ethanol-containing solutions were examined using X-ray photoelectron spectroscopy (XPS), optical microscopy with 3D stitching, immersion tests, and potentiodynamic polarization measurements. Results demonstrated that the ethanol concentration impacted little on the passive film stability while it dramatically influenced the pitting corrosion susceptibility. Corrosion rate of 316L after immersion tests first increased and then decreased as the concentration of ethanol increased from 0 to 10 M in ferric chloride solution. This, however, did not correspond to the breakdown potential which directly decreased from 489 to 249 mV as the water concentration decreased in ethanolic NaCl solutions. The pits density after both immersion and electrochemical tests showed that the initiation of pitting in ethanolic solution tended to occur at multiple points at the same time. The synergy effect on pitting behavior of hydrolysis enhancement and solubility reduction of metal cations due to the introduction of ethanol has also been discussed.

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“…In the study by Ferreira et al [17], the authors studied the effects of ethanol, sulfuric acid (H 2 SO 4 ), and chlorides on the corrosion resistance of AISI 316L SS using potentiodynamic polarization and EIS to perform the analysis. In the solution containing 65 wt.% ethanol and 35 wt.% water, the corrosion potentials were higher than those obtained in an aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

The Use of a Time-Frequency Transform for the Analysis of Electrochemical Noise for Corrosion Estimation

Arellano-Pérez

Escobar-Jiménez

Ramos-Negrón

et al. 2022

Mathematical Problems in Engineering

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This work shows the results of evaluating the corrosion type and rate (CR) in the 6061-T6 aluminum alloy exposed to ethanol-gasoline blends (E0, E10, E20, E30, E40, E60, E80, and E100) by analyzing electrochemical noise (EN) signals using the Shannon energy (SSE) and the synchrosqueezing transform (SST). The obtained results are compared against the obtained with the statistical method (Location Index, LI). The results obtained with the SSE method showed that the corrosion type in the 6061-T6 aluminum alloy is classified better than using the statistical method. Moreover, the SST results showed that the corrosion rate increased with the increment of the ethanol content in the ethanol-gasoline blends from values in the order of 10 − 4 to 10 − 3 mm/year.

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Influence of Ethanol, Acidity and Chloride Concentration on the Corrosion Resistance of AISI 316L Stainless Steel

Cited by 3 publications

References 5 publications

Evaluation of 316L Stainless Steel Corrosion Resistance in Solution Simulating the Acid Hydrolysis of Biomass

Evaluation of 316L Stainless Steel Corrosion Resistance in Solution Simulating the Acid Hydrolysis of Biomass

Influence of Ethanol on Pitting Corrosion Behavior of Stainless Steel for Bioethanol Fermentation Tanks

The Use of a Time-Frequency Transform for the Analysis of Electrochemical Noise for Corrosion Estimation

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