Effect of Bicarbonate Ion Additives on Pitting Corrosion of Type 316L Stainless Steel in Aqueous 0.5 M Sodium Chloride Solution

Park, J.-J.; Pyun, Su‐Il; Lee, W.-J.; Kim, H.-P.

doi:10.5006/1.3283998

Cited by 47 publications

(40 citation statements)

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“…The presence of only one time constant in Bode plots was also found by Wallinder et al 31 for 304L stainless steel in aqueous solution containing 0.05 mol L -1 H 2 SO 4 and 0.05 mol L -1 NaCl, after exposing the sample for 90 min at open circuit potential and polarizing the electrode by applying the open circuit potential. Park et al 35 obtained similar results for 316L stainless steel in aqueous solution containing 0.5 mol L -1 NaCl and 0.5 mol L -1 NaHCO 3 , applying different anodic potentials.…”

Section: Electrochemical Impedance Spectroscopy Measurementssupporting

confidence: 66%

“…, at 0.166 mV s -1 , and before starting the experiments, the sample was held at open circuit potential for 1 h. A simple and incomplete semi-circle in the complex plane plot is clearly seen, and similar impedance diagrams were recorded for all other conditions and studied solutions. According to Park et al, 35 in impedance experiments, a simple semi-circle corresponds to a charge transfer reaction by means of ionic migration through the passive oxide film. The Bode plots show only one time constant with a phase angle around -80 o that can be attributed to the oxide film on steel (Figure 5b).…”

Section: Electrochemical Impedance Spectroscopy Measurementsmentioning

confidence: 99%

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Influence of ethanol, acidity and chloride concentration on the corrosion resistance of AISI 316L stainless steel

Ferreira¹,

Noce²,

Fugivara³

et al. 2013

J. Braz. Chem. Soc.

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A influência do etanol, ácido sulfúrico e cloreto na resistência à corrosão do aço 316L foi investigada por meio de curvas de polarização e medidas de espectroscopia de impedância eletroquímica. No intervalo estudado, o potencial de corrosão do aço foi independente das concentrações de H 2 SO 4 e NaCl em solução aquosa. Por outro lado, em solução contendo 65% (m/m) de etanol e 35% (m/m) de água, os potencias de corrosão foram mais altos do que os observados em solução aquosa. Além disso, o potencial de corrosão do aço foi alterado pela adição de H 2 SO 4 e NaCl em solução. Em soluções com e sem etanol, mais 0,35% (m/m) de NaCl, a presença de 1% (m/m) de H 2 SO 4 inibiu o aparecimento de corrosão puntiforme.The influence of ethanol, sulfuric acid and chloride on the corrosion resistance of 316L stainless steel was investigated by means of polarization curves and electrochemical impedance spectroscopy measurements. Over the studied range, the steel corrosion potential was independent of H 2 SO 4 and NaCl concentrations in aqueous solution. On the other hand, in solution containing 65 wt.% ethanol and 35 wt.% water, the corrosion potentials were higher than those obtained in aqueous solution. Besides, the steel corrosion potential was affected by the addition of H 2 SO 4 and NaCl in solution. In solutions with and without ethanol, plus 0.35 wt.% NaCl, the presence of 1 wt.% H 2 SO 4 inhibited the appearance of pitting corrosion.

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Section: Electrochemical Impedance Spectroscopy Measurementssupporting

confidence: 66%

Section: Electrochemical Impedance Spectroscopy Measurementsmentioning

confidence: 99%

Influence of ethanol, acidity and chloride concentration on the corrosion resistance of AISI 316L stainless steel

Ferreira¹,

Noce²,

Fugivara³

et al. 2013

J. Braz. Chem. Soc.

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show abstract

“…The test electrolytes were naturally aerated (NA-) and nitrogen saturated (N 2 sat-) universal buffer solutions of pH (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12). The open circuit transients measured for the different steels have similar trends, where E oc from the instant of immersion shifts with time in the positive direction, indicating a spontaneous passivation due to development of an oxide film [12].…”

Section: Behaviour In Buffer Solutionsmentioning

confidence: 89%

“…Addition of Mo to the Cr-Ni stainless steels has long been known to improve their properties in many respects [1][2][3][4][5]. These include, diminishing the risk of passive film breakdown, especially in chloride-containing media and increasing both the passive film thickness and the alloy resistance for pitting and crevice corrosion.…”

Section: Introductionmentioning

confidence: 99%

Stability of spontaneous passive films on high strength Mo-containing stainless steels in aqueous solutions

2007

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The stability of naturally grown passive films on some Mo-containing stainless steel specimens was examined in aerated and deaerated universal buffer solutions with different pH (2-12) as well as in sulphate and chloride solutions. Open circuit potential (E oc ) and electrochemical impedance spectroscopy (EIS) were used as measuring techniques. In all cases, E oc shifts towards less negative values with time until the potential reaches its steady-state (E ss ) value. The E ss value is found to be more positive with decrease in solution pH or increase in Mo content in the alloy and becomes less positive in deaerated buffer solutions. Also, the thickening rate of the outer layer for the duplex passive film increases with increasing extent of Mo in the steel substrate or pH of the test solution. For a given alloy, E ss decreases linearly with the anion concentration (C), and is always more positive in Cl ) than in SO 4 2) media for C ‡ 0.05 M. Analysis of the EIS data showed that the total resistance (R T ) of the passive film has higher values in aerated solutions, and is generally lower in basic solutions. This indicates that lower solution pH favours the formation of oxide films offering better protection. Furthermore, the higher values of R T in Na 2 SO 4 solutions suggest the formation of more stable passive films in sulphate than in chloride solutions. This is discussed on the basis of the relative degree of anion incorporation into the passive films.

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“…For chloride concentrations below 0.35 wt % and temperatures 25 C, no pitting corrosion was observed, even when different regions of the sample were analyzed. Thus, under these conditions, the CPT ranged from 40 to 50 C. Figure 8 shows polarization curves for samples treated up to the transpassive region at 40 C (curve 1), and up to the potential regions corresponding to imperfect passivity 41 or metastable pits (curve 2), and stable pit formation (curve 3), both at 65 C. To ensure that metastable pitting formation occurred at the potential below the pitting potential, after attainment of the specific pitting potential, the current was reversed up to the repassivation potential. Metastable pit formation takes place in the potential region between the repassivation and pitting potentials.…”

Section: Resultsmentioning

confidence: 99%

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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Effect of Bicarbonate Ion Additives on Pitting Corrosion of Type 316L Stainless Steel in Aqueous 0.5 M Sodium Chloride Solution

Cited by 47 publications

References 0 publications

Influence of ethanol, acidity and chloride concentration on the corrosion resistance of AISI 316L stainless steel

Influence of ethanol, acidity and chloride concentration on the corrosion resistance of AISI 316L stainless steel

Stability of spontaneous passive films on high strength Mo-containing stainless steels in aqueous solutions

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

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