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SCC Mechanism of Ni Base Alloys in Lead Contaminated Water  

Hwang, Seong Sik (Korea Atomic Energy Research Institute)
Kim, Dong Jin (Korea Atomic Energy Research Institute)
Lim, Yun Soo (Korea Atomic Energy Research Institute)
Kim, Joung Soo (Korea Atomic Energy Research Institute)
Park, Jangyul (Korea Atomic Energy Research Institute)
Kim, Hong Pyo (Korea Atomic Energy Research Institute)
Publication Information
Corrosion Science and Technology / v.7, no.3, 2008 , pp. 187-191 More about this Journal
Abstract
Transgranular stress corrosion cracking of nickel base alloys was reported by Copson and Dean in 1965. Study to establish this cracking mechanism needs to be carried out. Laboratory stress corrosion tests were performed for mill annealed(MA) or thermally treated(TT) steam generator tubing materials in a high temperature water containing lead. An electrochemical interaction of lead with the alloying elements of SG tubings was also investigated. Alloy 690 TT showed a transgranular stress corrosion cracking in a 40% NaOH solution with 5000 ppm of lead, while intergranular stress corrosion racking was observed in a 10% NaOH solution with 100 ppm lead. Lead seems to enhance the disruption of passive film and anodic dissolution of alloy 600 and alloy 690. Crack tip blunting at grain boundary carbides plays a role for the transgranular stress corrosion cracking.
Keywords
Ni base alloys; alloy 600; alloy 690; Lead; Stress corrosion cracking; SCC mode;
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