Influence of Black Annealing Oxide Scale on the Anodic Behavior of Alloy 22

Rebak, Raúl B.; Etien, Robert A.; Gordon, Steven R.; Ilevbare, G. O.

doi:10.5006/1.3278235

Cited by 11 publications

(8 citation statements)

References 11 publications

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“…The compositions of the alloys are in Table 1. The Alloy 22 specimens were multiple crevice assemblies (MCA) described before [13] and the Ni-Gd and the 304B SS material were non-creviced prisms similar to the specimens described in ASTM G 5 [14]. The area of test specimens of these three bulk materials ranged from 7.43 to 14.4 cm².…”

Section: Methodsmentioning

confidence: 99%

Enhanced Corrosion Resistance of Iron-Based Amorphous Alloys

Rebak

Day

Lian

et al. 2007

Volume 7: Operations, Applications and Components

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Iron-based amorphous alloys possess enhanced hardness and are highly resistant to corrosion, which make them desirable for wear applications in corrosive environments. It was of interest to examine the behavior of amorphous alloys during anodic polarization in concentrated salt solutions and in the salt-fog testing. Results from the testing of one amorphous material (SAM2X5) both in ribbon form and as an applied coating are reported here. Cyclic polarization tests were performed on SAM2X5 ribbon as well as on other nuclear engineering materials. SAM2X5 showed the highest resistance to localized corrosion in 5 M CaCl 2 solution at 105°C. Salt fog tests of 316L SS and Alloy 22 coupons coated with amorphous SAM2X5 powder showed resistance to rusting. Partial devitrification may be responsible for isolated pinpoint rust spots in some coatings.

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Section: Methodsmentioning

confidence: 99%

Enhanced Corrosion Resistance of Iron-Based Amorphous Alloys

Rebak

Day

Lian

et al. 2007

Volume 7: Operations, Applications and Components

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“…28,35,44 There is limited information on the influence of bright and black annealing on crevice corrosion susceptibility of Ni-Cr-Mo alloys. 27,66,74 Black-annealing oxide from a solution heat treatment at 1121°C for 20 min followed by water quenching does not affect crevice corrosion resistance of alloy 22. 74 There is some evidence of a beneficial effect of the black annealed film in long-term immersion tests.…”

Section: Metallurgical Variablesmentioning

confidence: 99%

“…27,66,74 Black-annealing oxide from a solution heat treatment at 1121°C for 20 min followed by water quenching does not affect crevice corrosion resistance of alloy 22. 74 There is some evidence of a beneficial effect of the black annealed film in long-term immersion tests. 27 Efforts to apply the PD-GS-PD technique to alloy 22 and alloy C-22HS with the native oxide from different heat treatments were unsuccessful.…”

Section: Metallurgical Variablesmentioning

confidence: 99%

Crevice corrosion of nickel-based alloys considered as engineering barriers of geological repositories

Carranza

Rodríguez

2017

npj Mater Degrad

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Nickel-based alloys are considered among other candidate materials as engineering barriers of geological repositories due to their excellent corrosion resistance. These alloys possess unique advantages: they may be used in saturated and unsaturated repositories, hosted by practically any rock type, while also compatible with any (or no) backfill, and have minimal impact in other barriers. Alloy-22 (UNS N06022) has been the most studied of this class of alloys for its potential application in the proposed repositories (namely Yucca Mountain, USA). Crevice corrosion is however an important and often unintended degradation process that may limit the waste container lifetime if a nickel-based alloy is selected. Alloy susceptibility to crevice corrosion is influenced by environmental and metallurgical variables. This review gives an account of the current knowledge regarding crevice corrosion of nickel-based alloys as candidate materials for the corrosion-resistant layer of high-level nuclear waste containers. Although there is a significant amount of research supporting the use of nickel-based alloys for this application, the effect of the different variables on crevice corrosion resistance is described. Special focus is given to the current criterion for crevice corrosion occurrence in repository environments, recent works and criticisms. The presently established criterion appears robust for ruling out crevice corrosion in saturated repositories; however, the development of a less conservative criterion for crevice corrosion occurrence is necessary to use these alloys in unsaturated repositories.

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“…The specimens could be as-welded (ASW) or non-welded, but they were all multiple creviced. Two types of multi-creviced specimens were used, the prism crevice assembly (PCA) [15] and the lollipop [32]. The lollipop specimen is also called MCA (multiple crevice assembly).…”

Section: Experimental Techniquementioning

confidence: 99%

“…The environment at the repository site is mostly dry or unsaturated. If water enters in contact with the containers it would be via two main modes: (1) Dripping from the drift crown and walls and (2) Deliquescence of salts or dust collected during the early dry period [32]. The dripping from the drift crown/wall is basically ground water and the main process by which it will enter in contact with the container is generally called seepage.…”

Section: Introductionmentioning

confidence: 99%

Measuring the Repassivation Potential of Alloy 22 Using the Potentiodynamic-Galvanostatic-Potentiostatic Method

Evans¹,

Rebak²

2009

Advances in Electrochemical Techniques for Corrosion Monitoring and Measurement

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Traditionally, the susceptibility of Alloy 22 (N06022) to suffer crevice corrosion has been measured using the Cyclic Potentiodynamic Polarization (CPP) technique (ASTM G 61). When the alloy is not very susceptible to crevice corrosion, the values of repassivation potential obtained using the CPP technique are not highly reproducible. To circumvent the large uncertainty in the values of the repassivation potential by the CPP method, the repassivation potential of Alloy 22 may be measured using a slower method that combines sequentially potentiodynamic, galvanostatic, and potentio-static treatments (this method is called the Tsujikawa-Hisamatsu Electrochemical or THE method). In the THE method the anodic charge is applied to the specimen in a more controlled manner, which avoids driving the alloy to transpassivity and therefore results in more reproducible repassivation potential values. Results using THE method under various testing conditions are presented. A new standard has been prepared for ASTM balloting for the THE method. The round robin matrix results are also discussed.

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Influence of Black Annealing Oxide Scale on the Anodic Behavior of Alloy 22

Cited by 11 publications

References 11 publications

Enhanced Corrosion Resistance of Iron-Based Amorphous Alloys

Enhanced Corrosion Resistance of Iron-Based Amorphous Alloys

Crevice corrosion of nickel-based alloys considered as engineering barriers of geological repositories

Measuring the Repassivation Potential of Alloy 22 Using the Potentiodynamic-Galvanostatic-Potentiostatic Method

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