Using of transpassive dissolution for detection of structural changes in 9Cr–1Mo creep resistant steel

Rapouch, J.; Bystrianský, J.

doi:10.1179/1743278214y.0000000215

Cited by 5 publications

(3 citation statements)

References 21 publications

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“…For instance, Rapouch et al 58 observed, in long term aged specimens of P91 steel (9% Cr and 1% Mo), a high anodic peak which was attributed to Cr and Mo dissolution by fine deleterious precipitates using a 0.1 mol l −1 NaOH solution with of 1 mV s −1 . Nevertheless, other studies employing LSV were applied in several stainless steels.…”

mentioning

confidence: 99%

Sigma and Chi Phases Analysis in UNS S32750 Superduplex Stainless Steel by Optimized Linear Sweep Voltammetry in Alkaline Medium

Sampaio

Furtado

Tavares

et al. 2020

J. Electrochem. Soc.

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Linear sweep voltammetry (LSV) test parameters in alkaline medium were optimized by Doehlert matrix design in order to quantify the deleterious phases in a superduplex stainless steel UNS S32750. The microstructural analysis was performed, in several heat treated specimens, by Light Optical (LOM) and Scanning Electron (SEM) Microscopies and correlated with the electrochemical tests. In these tests, optimized parameters were obtained for tests in aqueous solutions of KOH. The concentration of 3.55 mol l −1 , scan rate of 3.42 mV s −1 and initial potential of −0.818 V, showed a good correlation between the deleterious phases precipitated and charge density values. Differently from LOM characterization, chi and sigma deleterious phases can be distinguished by LSV optimized test. Finally, this test can be a non-destructive powerful tool of quality control to detect embrittlement and corrosion resistance decay that commonly affected this stainless steel as consequence of inadequate fabrication processes.

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confidence: 99%

Sigma and Chi Phases Analysis in UNS S32750 Superduplex Stainless Steel by Optimized Linear Sweep Voltammetry in Alkaline Medium

Sampaio

Furtado

Tavares

et al. 2020

J. Electrochem. Soc.

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“…Despite the problems presented by the DL-EPR test, there is an electrochemical technique capable of directly analysing the deleterious phases, especially the sigma phase. When we perform linear sweep voltammetry (LSV-KOH), mainly in an alkaline medium [74,75,77,79], deleterious phases have a preferential dissolution. This preference occurs due to the transpassive dissolution of the Cr and Mo, elements present in more quantity in the deleterious phases.…”

Section: Resultsmentioning

confidence: 99%

DL-EPR vs. LSV-KOH: from simple detection of deleterious phases to analysis of morphology and high accuracy on determination of sigma phase in UNS S32750 stainless steel

Sampaio

Furtado

Ignácio

et al. 2022

Corrosion Engineering, Science and Technology

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An optimised electrochemical technique, linear sweep voltammetry (LSV) in KOH solution (LSV-KOH) was confronted with the double loop electrochemical Potentiokinetic reactivation (DL-EPR) to verify which is the best technique to quantify deleterious phases (DP) in a UNS S32750 super duplex stainless steel. DL-EPR presented an error in determination of deleterious phases in the range of 6.9-100%. LSV-KOH show a better accuracy in quantification of deleterious phases volume fractions, the error range for LSV-KOH was 2.4-26.2%. When the morphology of sigma changes from lamellar to divorced, was observed modifications on LSV-KOH voltammograms. In specimens where lamellar morphology is present, the voltammograms show two peaks curve. Meanwhile, in specimens where occurred also divorced precipitation of sigma the voltammograms changes to a 3 peaks curve. This feature is due to the dissolution of sigma phase boundaries which has different compositions according to the form of sigma precipitation.

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“…Recently, there have been several studies on the detection of these precipitates by electrochemical methods, 8,9 wherein strong alkaline solutions were used. In our previous research, the Laves phase and carbide were separately dissolved by potentiodynamic polarization in a deaerated 4.3 mol l −1 KOH solution.…”

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confidence: 99%

Mechanistic Understanding of the Dissolution Behavior of the Precipitates in 12Cr Martensitic Steel during Potentiodynamic Polarization in Strong Alkaline Solutions

Wang

Takeda

Zhong

et al. 2020

J. Electrochem. Soc.

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Cr was reported to result in a selective dissolution of the Laves phase in 12Cr steel in strong alkaline solutions. However, the current study concludes that Cr does not cause the dissolution of the Laves phase, but plausibly is responsible for the dissolution of Cr carbide at a higher potential. Further, the shoulder of the Laves phase peak resulted from the change of magnetite to hematite on the surface, and the shoulder of the carbide peak resulted from the transpassive behavior of Cr as alloying elements in the matrix.

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Using of transpassive dissolution for detection of structural changes in 9Cr–1Mo creep resistant steel

Cited by 5 publications

References 21 publications

Sigma and Chi Phases Analysis in UNS S32750 Superduplex Stainless Steel by Optimized Linear Sweep Voltammetry in Alkaline Medium

Sigma and Chi Phases Analysis in UNS S32750 Superduplex Stainless Steel by Optimized Linear Sweep Voltammetry in Alkaline Medium

DL-EPR vs. LSV-KOH: from simple detection of deleterious phases to analysis of morphology and high accuracy on determination of sigma phase in UNS S32750 stainless steel

Mechanistic Understanding of the Dissolution Behavior of the Precipitates in 12Cr Martensitic Steel during Potentiodynamic Polarization in Strong Alkaline Solutions

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