Interaction of lead with nickel-base Alloys 600 and 690
- Ecole Nationale Superieure de Chimie de Paris (France). Lab. de Physico-Chimie des Surfaces
- Framatome, Paris La Defense (France)
The results of a combined electrochemical and (X-Ray Photoelectron Spectroscopy (XPS)) study of the effects of lead on the passivation of nickel, chromium and nickel-based alloys with compositions close to Alloy 600 and 690 in acidic solutions at room temperature are reported. Lead was present as soluble PbO in 0.1M HClO{sub 4} and PbSO{sub 4} in 0.05M H{sub 2}SO{sub 4} or as controlled amounts of metallic lead deposited on the surface of the samples. Lead enhances the anodic dissolution of nickel (in perchloric and sulfuric acid solutions) and of Alloy 600 (in perchloric acid solution) whereas it has no effect on Cr and on Alloy 690. Pb{sup 2+} does not interact with an already formed passive film. The XPS study showed that the increased dissolution observed is caused by the formation of a Ni-Pb-anion (ClO{sub 4}{sup {minus}} or SO{sub 4}{sup 2{minus}}) complex on the metallic surface. Such a species is not produced on an oxidized surface.
- OSTI ID:
- 203805
- Report Number(s):
- CONF-950816-; ISBN 1-877914-95-9; TRN: 96:009771
- Resource Relation:
- Conference: 7. international symposium on environmental degradation of materials in nuclear power plants: water reactors, Breckenridge, CO (United States), 6-10 Aug 1995; Other Information: PBD: 1995; Related Information: Is Part Of Seventh international symposium on environmental degradation of materials in nuclear power systems -- Water reactors: Proceedings and symposium discussions. Volume 1; Airey, G.; Andresen, P.; Brown, J. [eds.] [and others]; PB: 664 p.
- Country of Publication:
- United States
- Language:
- English
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