Stress Corrosion Cracking of Alloy 600 in a High-Temperature Water Containing Sulfate and Thiosulfate

Eun Hee Lee; Kyung Mo Kim; Uh Chul Kim

doi:10.4028/www.scientific.net/KEM.277-279.644

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 277-279Stress Corrosion Cracking of Alloy 600 in a...

Stress Corrosion Cracking of Alloy 600 in a High-Temperature Water Containing Sulfate and Thiosulfate

Abstract:

The stress corrosion cracking (SCC) susceptibility of Alloy 600 MA has been studied in deaerated 0.01 M sodium sulfate (Na2SO4) and sodium thiosulfate (Na2S2O3) solutions at 340°C. Pre-strained reverse U-bend (RUB) specimens are tested using a static-autoclave system. The specimens show an intergranular SCC and a higher resistance to SCC in a Na2S2O3 solution than in a Na2SO4 solution. The results of the deposits and surface analyses by using XRD and SEM/EDS confirm the existence of the sulfides. The SCC of Alloy 600 MA is associated with the reduced sulfur species and protective oxide film properties formed on the alloy surface in the Na2SO4 and Na2S2O3 solutions.

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Key Engineering Materials (Volumes 277-279)

Pages:

644-648

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.277-279.644

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Online since:

January 2005

Authors:

Eun Hee Lee, Kyung Mo Kim, Uh Chul Kim

Keywords:

Alloy 600, Reduced Sulfur Species, Steam Generator (SG), Stress Corrosion Cracking (SCC), Sulfate, Thiosulfate

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