Quantitative comparison of the influences of tungsten and molybdenum on the passivity of Fe-29Cr ferritic stainless steels

Ahn, MyoungKi; Kwon, Hyuk‐Sang; Lee, H.M.

doi:10.1016/s0010-938x(97)00138-8

Cited by 29 publications

(7 citation statements)

References 10 publications

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“…In [2], it was found that the presence of Mo and W, which have similar electrical conductivities and electronegativities and are the dominant alloying elements of HSS, lead to beneficial effects on the passivity parameters of stainless steels. A quantitative relationship between passivation parameters and the Mo and W content was seen, although the reason for this was not clear.…”

Section: Resultsmentioning

confidence: 99%

“…There is much work in the literature dealing with the influence of www.elsevier.com/locate/corsci Corrosion Science 44 (2002) [1949][1950][1951][1952][1953][1954][1955][1956][1957][1958][1959][1960][1961][1962][1963][1964][1965] alloying elements, mainly W [1][2][3], Mo [2][3][4] and Cr [3,5], on the passivation (or repassivation) ability of stainless steels. Due to the presence of these elements, stainless steels are able to passivate even in solutions containing aggressive ions, and consequently have very positive pitting potentials.…”

Section: Introductionmentioning

confidence: 99%

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Influence of alloying on the passive behaviour of steels in bicarbonate medium

Alves

Brett

2002

Corrosion Science

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The electrochemical behaviour of passive films on carbon steel, chromium steel and high speed steel (HSS) was studied in 0.5 M NaHCO 3 . The influence of the presence of 10 mM potassium chloride on passive film stability, and of the heat treatment of chromium steel and HSS on the respective film properties, was also investigated. Polarization curves showed that the alloy composition exerts a significant influence on the onset of passive film formation, chromium and HSSs passivating more easily as a result of the higher alloying content. Values of passive current, obtained both potentiodynamically and at fixed potential, were higher for HSS than for carbon and chromium steels, which was attributed to the contributions of Mo and W to the passive film composition. The presence of chloride ion delays the passivation of chromium and HSSs, but does not interfere with passive film stability, as shown by the chronoamperometric profile and passive current values. In the case of carbon steel, with no alloying elements, chloride ion diminishes film stability but does not influence passive film formation. Heat treatment, which alters the microstructure, does not alter the properties of the passive films except for a small effect on those formed potentiodynamically on HSS. Ó

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of alloying on the passive behaviour of steels in bicarbonate medium

Alves

Brett

2002

Corrosion Science

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“…It is seen that the I pas values are higher for HSS. In [2], it was found that the presence of Mo and W, which have similar electrical conductivities and electronegativities and are the dominant alloying elements of HSS, lead to beneficial effects on the passivity parameters of stainless steels. A quantitative relationship between passivation parameters and the Mo and W content was seen, although the reason for this was not clear.…”

Section: Effect Of Alloyingmentioning

confidence: 99%

“…The passivation of steels is a subject of much interest due to its influence on the rate of corrosion. There is much work in the literature dealing with the influence of www.elsevier.com/locate/corsci Corrosion Science 44 (2002) 1949-1965 alloying elements, mainly W [1][2][3], Mo [2][3][4] and Cr [3,5], on the passivation (or repassivation) ability of stainless steels. Due to the presence of these elements, stainless steels are able to passivate even in solutions containing aggressive ions, and consequently have very positive pitting potentials.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Alloying on the Passive Behaviour of Steels in a Bicarbonate Medium Studied by Electrochemistry and XPS

Alves

Brett

2002

KEM

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The electrochemical behaviour of passive films on carbon steel, chromium steel and high speed steel (HSS) was studied in 0.5 M NaHCO 3. The influence of the presence of 10 mM potassium chloride on passive film stability, and of the heat treatment of chromium steel and HSS on the respective film properties, was also investigated. Polarization curves showed that the alloy composition exerts a significant influence on the onset of passive film formation, chromium and HSSs passivating more easily as a result of the higher alloying content. Values of passive current, obtained both potentiodynamically and at fixed potential, were higher for HSS than for carbon and chromium steels, which was attributed to the contributions of Mo and W to the passive film composition. The presence of chloride ion delays the passivation of chromium and HSSs, but does not interfere with passive film stability, as shown by the chronoamperometric profile and passive current values. In the case of carbon steel, with no alloying elements, chloride ion diminishes film stability but does not influence passive film formation. Heat treatment, which alters the microstructure, does not alter the properties of the passive films except for a small effect on those formed potentiodynamically on HSS.

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“…18,19 It has been suggested that tungsten (W) has the same beneficial effect on passivity as Mo. [20][21][22][23] Interestingly, W is included in the PRE expression (Eq. 2) in ISO 21457.…”

mentioning

confidence: 99%

The Role of Tungsten on the Phase Transformation Kinetics and its Correlation with the Localized Corrosion Resistance of 25Cr Super Duplex Stainless Steels

Torres

Hazarabedian

Quadir

et al. 2020

J. Electrochem. Soc.

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Super Duplex Stainless Steels (SDSS) have excellent corrosion resistance due to their high concentration of alloying elements like Cr, Mo, and N. There is still, however, disagreement on the role of tungsten in the corrosion resistance of stainless steels. In this regard, the influence of tungsten on tertiary phase precipitation kinetics remains a chief source of controversy. In this study, three different SDSS with different tungsten contents have been investigated, namely, UNS S32750 (W-free), S32760 (0.6 wt% W), and S39274 (2.1 wt% W). Different isothermal aging conditions were studied, followed by microstructure characterization using scanning electron microscopy, energy dispersive X-ray spectroscopy, electron backscatter diffraction, and transmission electron microscopy to quantify the type and volume fraction of tertiary phases and intermetallic compounds. Time-Temperature-Transformation-Corrosion maps were constructed by quantifying the changes in pitting corrosion resistance caused by the precipitation of incremental amounts of deleterious phases. Results showed that 2.1 wt% W additions retarded the precipitation kinetics of all tertiary phases—including σ-phase—favoring the formation of χ-phase. Both χ- and σ-phase affected corrosion resistance, reducing the critical pitting temperature by 10 °C–20 °C at concentrations well below 1 vol%.

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Quantitative comparison of the influences of tungsten and molybdenum on the passivity of Fe-29Cr ferritic stainless steels

Cited by 29 publications

References 10 publications

Influence of alloying on the passive behaviour of steels in bicarbonate medium

Influence of alloying on the passive behaviour of steels in bicarbonate medium

The Influence of Alloying on the Passive Behaviour of Steels in a Bicarbonate Medium Studied by Electrochemistry and XPS

The Role of Tungsten on the Phase Transformation Kinetics and its Correlation with the Localized Corrosion Resistance of 25Cr Super Duplex Stainless Steels

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