Crevice corrosion of solution annealed 25Cr duplex stainless steels: Effect of W on critical temperatures

Torres, Cristian; Johnsen, Roy; Iannuzzi, Mariano

doi:10.1016/j.corsci.2020.109053

Cited by 31 publications

(28 citation statements)

References 54 publications

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“…The crevice attack initiates at a/c boundaries. In all cases, a is selectively corroded; whereas dissolution of c occurrs at a later stage during crevice propagation [40]. The crevice corrosion resistance of 2304 DSS has been reported to decrease with increasing annealing temperature from 1030 to 1150°C [41].…”

Section: Corrosion Propertiesmentioning

confidence: 98%

Characteristics and Manufacturability of Duplex Stainless Steel: A Review

Patra

Agrawal²,

Mandal

et al. 2021

Trans Indian Inst Met

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Duplex stainless steels (DSS) have been growing continuously as they are cost effective alternative to austenitic stainless steel with better mechanical and corrosion resistance. Duplex stainless steel compositions are expanding in both directions towards leaner and richer chemistry for popular as well as very critical applications. The strength of DSS is its high yield strength compared to popular austenitic series and corrosion resistance particularly pitting and chloride stress corrosion cracking. Challenges of DSS remain in the embrittlement phase formation during the manufacturing of highly alloyed DSS, hot cracking and formability of the steel. Super duplex and hyper duplex steels are finding extremely critical application due to their good mechanical properties and corrosion resistance even replacing Nickel based alloys and Ti alloys in few applications. The paper reviews the characteristics and manufacturability of duplex stainless steel including recent developments.

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Section: Corrosion Propertiesmentioning

confidence: 98%

Characteristics and Manufacturability of Duplex Stainless Steel: A Review

Patra

Agrawal²,

Mandal

et al. 2021

Trans Indian Inst Met

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“…While both phases corroded uniformly in the case of UNS S32750, S39274 suffered selective dissolution of the α-phase. In this regard, ferrite can be distinguished easily from austenite using EDS due to its lower Ni and higher Cr and Mo concentration [6,34]. The surface chemical composition of each phase for both materials obtained by EDS before and after the corrosion testing is presented in Table 2.…”

Section: Crevice-like-solutionsmentioning

confidence: 99%

“…In this work, Galvele's model was used to estimate the theoretical E crit in different crevice-like-solutions and to study the validity of the model to predict crevice corrosion potentials, more specifically E R,Crev as it is widely used to define a protection potential [6]. Figure 10 compares E crit values estimated by the critical acidification model in this work and by Kappes et al [11] with experimental E R,Crev results of UNS S32750 and UNS S39274 measured by the PD-GS-PD technique in 3.5% NaCl (pH = 6.5) by Torres et al [6]. In this regard, Torres et al established a T R,Crev = 55 • C for UNS S39274 in 3.5 wt.% NaCl by the PD-GS-PD technique.…”

Section: Prediction Of Crevice Corrosion Repassivation Potentialmentioning

confidence: 99%

“…Tungsten (W) is another element that has been shown to improve corrosion resistance. However, the effect of W on localized corrosion resistance is still disputed, as discussed in detail elsewhere [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…Another recent publication [6] examined the influence of W as a solid solution element, i.e., in the absence of tertiary phases, on the crevice corrosion resistance of the same SDSS. temperature (CCT) and T R,Crev values from long-term exposure in natural seawater.…”

Section: Introductionmentioning

confidence: 99%

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Use of the Critical Acidification Model to Estimate the Influence of W in the Localized Corrosion Resistance of 25Cr Super Duplex Stainless Steels

Torres

Iannuzzi

Johnsen

2020

Metals

Self Cite

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Two super duplex stainless steels (SDSS) with different W content, namely UNS S32750 (W-free) and UNS S39274 (2.1 wt.% W), were tested in simulated crevice corrosion environments to determine the influence of W on their corrosion resistance. Anodic potentiodynamic polarization experiments were performed in two different crevice-like-solutions: 1 M HCl (as reference for a pH = 0 environment), and 7 M LiCl, adjusted to the same pH value. Galvele’s critical acidification model was used to estimate the theoretical critical potential (Ecrit) and comparatively evaluate the corrosion resistance of the two SDSS. The anodic potentiodynamic polarization results showed a statistically significant difference between the two materials in only one test condition, i.e., 7 M Cl− at 60 °C. Additionally, the quantification of chemical dissolution of the metal cations after the tests suggested a surface enrichment in W only in the 7 M chloride solution. Scanning electron microscope (SEM) analysis indicated a uniform dissolution experienced by UNS S32750 in this environment, whereas UNS S39274 suffered selective corrosion of the ferrite-phase. These observations were reflected in a slight increase in the Ecrit values of UNS S32974 estimated with Galvele’s model.

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Localized corrosion of (lean) duplex stainless steels in immersion units of urban wastewater treatment plants

Larché

Emo

Johansson

et al. 2021

Materials & Corrosion

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With lower alloying cost and higher mechanical properties, lean duplex stainless steels can be an alternative to the more commonly used austenitic stainless steels. However, these alloys are still not the preferred choice, probably due to a lack of field experience. A study was thus initiated in view of defining the limits of use of selected (lean) duplexes for urban wastewater treatment units. The present paper shows the localized corrosion performance of selected lean duplexes in chloride contaminated solutions. The results are compared with austenitic S30403 and S31603 and with the more standard duplexes S82441 and S32205. The effect of welding was also investigated. Exposures in field municipal wastewater plants were conducted for 1 year in low and high chloride content units. The results show that lean duplexes S32101 and S32202 can be used as alternatives to S30403 and S31603 in low chloride electrolytes. At 500 ppm of chloride content, duplex stainless steel S32304 showed better corrosion resistance than S30403 and S31603. For higher chloride contents (1000 ppm and above) the standard duplexes S82441 and S32205 shall be preferred.

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Crevice corrosion of solution annealed 25Cr duplex stainless steels: Effect of W on critical temperatures

Cited by 31 publications

References 54 publications

Characteristics and Manufacturability of Duplex Stainless Steel: A Review

Characteristics and Manufacturability of Duplex Stainless Steel: A Review

Use of the Critical Acidification Model to Estimate the Influence of W in the Localized Corrosion Resistance of 25Cr Super Duplex Stainless Steels

Localized corrosion of (lean) duplex stainless steels in immersion units of urban wastewater treatment plants

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