The effect of Cl− ions on the passivation of Fe26Cr alloy

Mitrovic-Scepanovic, V.; MacDougall, B.; Graham, M. J.

doi:10.1016/0010-938x(87)90020-5

Cited by 29 publications

(19 citation statements)

References 20 publications

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“…The mechanism is autocatalytic because the increased acidity accelerates the dissolution rate inside pits. This is confirmed by results obtained in chloride solution, where surface analysis showed the presence of Cl − ions in the outer part of the film formed by electrochemical passivation 10–16.…”

Section: Introductionsupporting

confidence: 83%

Electrochemical study of stainless steels used in an oil company by electrochemical impedance

Boudinar

Innal

Chadli

et al. 2010

Materials & Corrosion

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Localized corrosion is a serious problem for stainless steel exposed in a chloride solution. In this context, the present work concerns the study of electrochemical behavior of 316 (A and B) and 430 (C and D) stainless steels, where A and C are laboratory steels, while steels B and D were taken from heat exchangers tubes (after 10 years of operation). This study has addressed three different aqueous environments: (1) monoethanolamine (MEA) 15%, (2) natural seawater (NSW), and (3) NaCl 3%, using the technique of potentiodynamic polarization curve complemented by electrochemical impedance spectroscopy (EIS). The obtained experimental electrochemical parameters (E corr , J corr , E r , C d , R tc , and constant phase element) were used to compare the corrosion resistance of the tested steels. As a result, the nobility of these steels in NaCl 3% and in MEA 15% solutions is established in the following order: 316 (A) > 316 (B) > 430 (C) > 430 (D), where E r moves increasingly toward the positive direction, indicating a good protection against corrosion. In addition, the results show that the effect of the electrolyte (aggression) is characterized by increased corrosion potential and a decrease in the passivity domain for all samples. The hierarchy of the nobility of steels A and C in these electrolytes can be determined as follows: MEA 15% > NSW > NaCl 3%.

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Section: Introductionsupporting

confidence: 83%

Electrochemical study of stainless steels used in an oil company by electrochemical impedance

Boudinar

Innal

Chadli

et al. 2010

Materials & Corrosion

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“…e solution can play a role in accentuating the effect of the magnetic saturation. For example, the pronounced pseudopassive behavior observed for corrosion of the base alloy in NaCl in this study could have been aided by the effect of higher Cl − ion concentration, which also encourages pseudopassive behavior [28].…”

Section: Surface Phases Aer Corrosionmentioning

confidence: 80%

“…e pseudopassive behavior observed for WC-10Co hardmetal in the NaCl test solution is in contrast with other literatures [27] where dilute (0.1 M) NaCl solutions were used. is is because the higher Cl − anion concentration used in this study compared to literature favours passivation [28].…”

Section: Potentiodynamic Polarisation Behaviourmentioning

confidence: 87%

“…Its formation on the specimens tested in SMW was however not accompanied by pseudopassive behaviour. e difference in pseudopassive behavior between the NaCl and SMW could have been caused by the difference in Cl − anion concentrations, where the higher concentrations in NaCl encouraged passivation compared to the low concentration obtained in the SMW [28]. It is also possible that the WO 3 �lm formed in SMW had poorer adhesion properties.…”

Section: Surface Phases Aer Corrosionmentioning

confidence: 99%

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Corrosion of WC-VC-Co Hardmetal in Neutral Chloride Containing Media

et al. 2013

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The effect of varying VC content on the corrosion behavior of WC-10 wt% Co hardmetals in sodium chloride (NaCl) and synthetic mine water (SMW) solutions has been investigated using anodic polarization scans and surface analytical methods. It is shown that the polarization behavior is active-pseudopassive in NaCl and active in SMW regardless of the VC content, while the corrosion resistance is poorer and independent of VC content in NaCl but better at high VC contents in SMW. The corrosion behavior of samples is explained using the effect of VC on the chemical composition of the binder.

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“…On the other hand, the effect of chloride ion on the passivity of stainless steels is well known and the passivity in presence of chloride is more deteriorated than its absence. [46][47][48][49] As a result, the presence of chloride ion may assist the passivity breakdown in the DL-EPR method. The results show that the average S/N ratio for different chloride ions is almost similar, indicating a low influence of the chloride ion on the results of the measured DOS.…”

Section: Taguchi Resultsmentioning

confidence: 99%

New High-Resolution Solution for Measuring Degree of Sensitization of Duplex Stainless Steel 2205 Using Double-Loop Electrochemical Potentiodynamic Reactivation Technique

Hashemi¹,

Davoodi²,

Momeni³

et al. 2013

CORROSION

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In the present work, a new high-resolution solution for measuring degree of sensitization (DOS) of duplex stainless steel (DSS) 2205 (UNS S31803) by double loop-electrochemical potentiodynamic reactivation (DL-EPR) technique was obtained and the solution parameters were optimizing using the Taguchi method. Sensitized samples in three different conditions were chosen and five solution main factors including acid and two types of depassivator concentrations, scan rate, and surface roughness were considered. To reduce the number of experiments, Taguchi orthogonal array (OA) was used. The resulting optimal condition was to be 0.5 M sulfuric acid (H 2 SO 4), 0.002 M sodium thiosulfate (Na 2 S 2 O 3), 0.02 M sodium chloride (NaCl), and 120 grid in surface roughness and 30 mV/min scan rate. By introducing the new solution, a DOS value of 78% was obtained in the DSS2205 sample sensitized at 850°C for 40 min. Moreover, topography variations of non-sensitized and sensitized samples measured by atomic force microscopy elucidated the mechanism of austenite/ ferrite boundary attack and carbide precipitates formation in sensitized samples extended to the ferrite phase.

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The effect of Cl− ions on the passivation of Fe26Cr alloy

Cited by 29 publications

References 20 publications

Electrochemical study of stainless steels used in an oil company by electrochemical impedance

Electrochemical study of stainless steels used in an oil company by electrochemical impedance

Corrosion of WC-VC-Co Hardmetal in Neutral Chloride Containing Media

New High-Resolution Solution for Measuring Degree of Sensitization of Duplex Stainless Steel 2205 Using Double-Loop Electrochemical Potentiodynamic Reactivation Technique

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