Studies of IGA intergranular attack/stress corrosion cracking related parameters and remedies

Stutzmann, A.; Nordmann, F.

doi:10.1016/0029-5493(95)01143-9

Cited by 9 publications

(3 citation statements)

References 1 publication

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“…Alumino-silicates are good buffering agents for caustic solutions implying a pH T of less than 10, which is very close to the lower threshold for caustic attack of alloy 600. In addition, near-neutral or slightly alkaline crevice conditions are now frequently deduced from MULTEQ calculations and hideout return studies (16,17).…”

Section: Superheated Crevices In Recirculating Steam Generatorsmentioning

confidence: 99%

An Overview of Internal Oxidation as a Possible Explanation of Intergranular Stress Corrosion Cracking of Alloy 600 in PWRS

Scott¹

1999

Ninth International Symposium on Environmental Degradation of Materials in Nuclear Power Systems—Water Reactors

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The main purpose of the present paper is to compare the results of recent high resolution microscopy of intergranular stress corrosion cracking of alloy 600 in various environments encountered during the operation of PWRs with the hypothesis that cracking is caused by the phenomenon of internal oxidation. Some of the points of criticism, which have arisen as to the applicability of the internal oxidation mechanism at typical PWR operating temperatures and corrosion potentials, are also addressed. These are specifically the problem of reconciling the apparent rate of intergranular diffusion of oxygen in nickel base alloys with the observed rates of cracking and the thermodynamic requirement for internal oxidation that the corrosion potential be at or below the Ni/NiO redox potential. The latter point is of particular concern if this mechanism is invoked to explain secondary side steam generator tube IGA/IGSCC.

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Section: Superheated Crevices In Recirculating Steam Generatorsmentioning

confidence: 99%

An Overview of Internal Oxidation as a Possible Explanation of Intergranular Stress Corrosion Cracking of Alloy 600 in PWRS

Scott¹

1999

Ninth International Symposium on Environmental Degradation of Materials in Nuclear Power Systems—Water Reactors

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“…Much more recently great economic losses have been reported in light water reactor (LWR), units in the nuclear industry due to SSC incidents, such as pipe weld cracking in austenitic stainless steels in the boiling water reactor (BWR), coolant systems, failures in control rod tube guide pins fabricated from SuperNi-alloy in pressurised water reactor (PWR), units and extensive in steam generator tubes in many recirculating type PWR units [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Some effects of yield strength on the stress corrosion cracking behaviour of low alloy steels in aqueous environments at ambient temperatures

Bulloch

2004

Engineering Failure Analysis

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“…Un der nor mal con di tions, a long time is needed (ap prox i mately 10000 hours) be fore the SCC cracks ap pear [2]. That is why the ac cel er ated elec tro chem i cal cor ro sion tests must be used to study the sus cep ti bil ity of Incoloy-800 at SCC.…”

Section: Introductionmentioning

confidence: 99%

Electro chemical studies on stress corrosion cracking of Incoloy-800 in caustic solution, part I: As received samples

Dinu¹,

Fulger²,

Ionescu³

et al. 2005

NUCL TECH RAD PROT

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Many non-volatile impurities accidentally introduced into the steam generator tend to Concentrate on its surface in restricted flow areas. In this way these impurities can lead to stress corrosion cracking (SCC) on stressed tubes of the steam generator. Such impurities can be strong alkaline or acid solutions. To evaluate the effect of alkaline concentrated environments on SCC of steam generator tubes, the tests were con ducted on stressed samples of Incoloy-800 in 10% NaOH solution. To accelerate the SCC process, stressed specimens were anodically polarised in a caustic solution in an electro chemical cell. The method of stressing of Incoloy-800 tubes used in our experiments was the C-ring. Using the cathodic zone of the potentiodynamic curves it was possible to calculate the most important electrochemical parameters: the corrosion current, the corrosion rate, and the polarization resistance. We found that the value of the corrosion potential to initiate the SCC microcracks was -100 mV. The tested samples were examined using the metallographic method. The main experimental results showed that the in crease of the stress state promoted the in crease of the SCC susceptibility of Incoloy-800 samples tested under the same conditions, and that the length of the SCC-type microcracks in creased with the growth of the stress value

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Studies of IGA intergranular attack/stress corrosion cracking related parameters and remedies

Cited by 9 publications

References 1 publication

An Overview of Internal Oxidation as a Possible Explanation of Intergranular Stress Corrosion Cracking of Alloy 600 in PWRS

An Overview of Internal Oxidation as a Possible Explanation of Intergranular Stress Corrosion Cracking of Alloy 600 in PWRS

Some effects of yield strength on the stress corrosion cracking behaviour of low alloy steels in aqueous environments at ambient temperatures

Electro chemical studies on stress corrosion cracking of Incoloy-800 in caustic solution, part I: As received samples

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