Role of Methanol on Pitting of Type 316 Stainless Steel

Thodla, Ramgopal; Amancherla, S.

doi:10.5006/1.3278150

Cited by 8 publications

(4 citation statements)

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“…The breaking potential gradually decreased from 489 to 239 mV with the addition of ethanol. In methanolic solutions, the dissolution of metal matrix in pits slows down due to the lower diffusion coefficient of metal cations (Ramgopal and Amancherla, 2012 ). Similar phenomenon occurred in the ethanolic solutions.…”

Section: Resultsmentioning

confidence: 99%

“…Some researches postulated that passivation of stainless steel would fail in anhydrous solutions with water less than 70 mole % (Kelly and Moran, 1990 ). In addition to the influence of methanol on passive film, dissolution kinetics in pits were activated with increasing water concentration in methanol/NaCl at a given potential (Ramgopal and Amancherla, 2012 ).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…Since the 1980s, corrosion work on alcoholic solvents was generally carried out in methanol-based environments rather than in ethanol-based environments. Surface electrochemistry, [16][17][18][19][20] passivation, 21,22 pitting corrosion, 23,24 and SCC [25][26][27] have been investigated by different researchers to understand the interfacial behavior of metal and to address the corrosion mechanisms. Prior work focused on the common constituents or impurities, such as water and chloride ions, and acidity in commercial biofuels.…”

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confidence: 99%

Film Breakdown and Anodic Dissolution during Stress Corrosion Cracking of Carbon Steel in Bioethanol

Lou

Yang

Singh

2010

J. Electrochem. Soc.

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The stress corrosion cracking (SCC) behavior of X-65 carbon steel was investigated in simulated fuel-grade ethanol (SFGE) using the slow strain rate test method, potentiodynamic polarization, electrochemical impedance spectroscopy, open-circuit potential, and potentiostatic current monitoring. Results indicate that crack initiation on carbon steel in the SFGE environment is associated with plastic deformation in the material, which leads to a surface film breakdown. The competition between active anodic dissolution and repassivation ahead of the crack tip controlled the propagation of these cracks in SFGE. Within the anodic dissolution range, both crack density and crack growth rate in the through-thickness direction increased as the potential increased. The applied cathodic potential eliminated the SCC in this system. The mode of SCC for the carbon steel in aerated SFGE was predominately transgranular.

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“…Experimental measurements using artificial pit electrodes of 316 L stainless steel in CH 3 OH-H 2 O-Cl − mixtures suggest that the critical metal-chloride concentration, C crit , for repassivation increases with an increase in H 2 O content. 79 This would suggest an increase in CPT with H 2 O because higher dissolution rate is necessary to maintain the pit electrolyte concentration above the critical concentration (Eq. 4).…”

Section: Discussionmentioning

confidence: 99%

Review—Effects of Solution and Alloy Composition on Critical Crevice Temperature

Sridhar

Anderko

Kung

2023

J. Electrochem. Soc.

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Critical temperature for localized corrosion can be a good design parameter because localized corrosion is not likely to occur below that temperature. The critical temperature depends on alloy composition, microstructure, and environment chemistry (including its redox potential). Here we review the literature on critical temperature for localized corrosion, expressed either as critical pitting temperature (CPT) or critical crevice temperature (CCT). A history of various testing methods is presented. Different approaches for modeling the temperature of transition to active pit growth are reviewed, including probabilistic aspects of critical temperature. A semi-empirical, electrolyte-based model is described that can be useful in predicting CCT in service environments that differ from standard laboratory test environments. The model predictions are compared to experimental data for various alloys. The effect of solvent on CCT/CPT is described briefly and future avenues of research are recommended.

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Role of Methanol on Pitting of Type 316 Stainless Steel

Cited by 8 publications

References 0 publications

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

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

Film Breakdown and Anodic Dissolution during Stress Corrosion Cracking of Carbon Steel in Bioethanol

Review—Effects of Solution and Alloy Composition on Critical Crevice Temperature

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