Corrosion of similar and dissimilar metal crevices in the engineered barrier system of a potential nuclear waste repository

He, Xihua; Dunn, Darrell S.; Csontos, A.

doi:10.1016/j.electacta.2006.12.077

Cited by 31 publications

(24 citation statements)

References 6 publications

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“…76 There are documented situations in which crevice corrosion will not proceed at E > E R,CREV , and even if it starts, its self-limited propagation will avoid complete penetration of the container wall. 77,78 Points of criticism to this criterion are summarised below.…”

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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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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“…Hornus and Rodr'guez [7] think that localised corrosion, such as crevice or pitting corrosion, is one of the most important degradation processes that will limit the lifetime of containers. Crevices will occur when HLW containers are in contact with supporting structures or with undersurface deposits, corrosion products, passive film destroyed, etc [7][8][9]. The corrosion degree will depend on the concentration of the groundwater in contact with the canister surface and, especially, the anions, such as Cl − , SO 4 2− and CO 3 2− .…”

Section: Effects Of Anions On Corrosion Behaviour Of Carbon Steel In mentioning

confidence: 99%

Effects of anions on corrosion behaviour of carbon steel in simulated groundwater in China

Pang

Gao

2017

Corrosion Engineering, Science and Technology

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Carbon steel is a candidate material for the disposal container of high-level nuclear waste in a deep geological repository in China, which will be subject to general corrosion and localised attack. In this work, the effects of Cl − , SO 4 2-and CO 3 2− concentrations on the general corrosion and crevice corrosion of carbon steel were studied by immersion tests and electrochemical measurements. The results show that Cl − promotes general corrosion, while SO 4 2− and CO 3 2− inhibit general corrosion. In a single ion solution, SO 4 2− is the most obvious in promoting the crevice corrosion, which is different from the result of carbon steel in groundwater solution. Cl − , rather than SO 4 2− , dominates the crevice corrosion process of carbon steel in groundwater solution.ARTICLE HISTORY

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“…The purpose of research done by He and co-workers [14] was to evaluate the specific role of both similar and dissimilar metal-to-metal crevices on the corrosion behavior of: (i) Type 316L stainless steel, (ii) Titanium Grade 7, (iii) mill-annealed Alloy 22, and (iv) welded plus solution annealed Alloy 22, under simulated environmental conditions.…”

Section: Corrosion Of Metal Crevices In the Engineered Barrier Systemmentioning

confidence: 99%

“…Therefore, isolation of the two metals may be necessary in order to ensure adequate long-term performance of the structure that contains titanium gusset plates while remaining sections of the structure are made from structural steel. A brief review of the existing literature is presented in this section to identify existing corrosion data specific to steel and titanium joints and the potential use of possible isolation techniques [12][13][14][15][16][17][18][19][20][21][22]24].…”

Section: Galvanic Corrosionmentioning

confidence: 99%

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Isolating Corrosion of Steel Plates Coupled With Titanium

Patnaik

Xi²,

Adams³

et al. 2014

Volume 10 Number 2

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Over twenty six percent of the bridges in the United States are structurally deficient or functionally obsolete. Corrosion of steel used in structures like bridges and buildings is a problem that has gained increased interest and focused concern. Steel is often the metal that is preferred for use in such applications due to a synergism of ease of availability, acceptable mechanical properties and cost effectiveness. Through the years, titanium has grown in strength, stature and significance to be recognized as an emerging high performance metal that is both stronger and lighter than steel. A distinctive property of titanium and its alloys is its non-corrosive nature. However, a major drawback in the selection and use of pure titanium or its alloy counterpart is the prohibitively high cost. Therefore, it may be possible to combine steel and pure titanium and/or its alloy in structures by restricting steel for bulk of the structure and selectively using titanium and its alloys for the critical but low volume elements, such as, gusset plates and bearings. A hybrid use of titanium in conjunction with steel for structural members will result in better performance while concurrently proving to be both cost-effective and economically affordable. The synergistic use of structural steel and titanium in close proximity with each other could result in accelerated corrosion of steel in the immediate vicinity of titanium. The corrosion performance of titanium plates coupled with steel members is presented. A few viable strategies for minimizing galvanic coupling effects between steel and titanium are discussed. Corrosion experiments were conducted to measure the severity of corrosion when titanium and steel form a galvanic couple, and copper and steel was a comparative system. The study revealed that adequate precautions are needed to minimize localized corrosion when titanium gusset plates are coupled with structural steel members.

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Corrosion of similar and dissimilar metal crevices in the engineered barrier system of a potential nuclear waste repository

Cited by 31 publications

References 6 publications

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

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

Effects of anions on corrosion behaviour of carbon steel in simulated groundwater in China

Isolating Corrosion of Steel Plates Coupled With Titanium

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