Volume 180, 2015

Pitting of steam-generator tubing alloys in solutions containing thiosulfate and sulfate or chloride

Abstract

The pitting of nuclear steam generator tubing alloys 600, 690 and 800 was studied at 60 °C using dilute thiosulfate solutions containing excess sulfate or (for Alloy 600) chloride. A potentiostatic scratch method was used. In sulfate solutions, all alloys pitted at low potentials, reflecting their lack of protective Mo. The alloys demonstrated the most severe pitting at a sulfate : thiosulfate concentration ratio of ∼40. Alloy 600 pitted worst at a chloride : thiosulfate ratio of ∼2000. The results are interpreted through the mutual electromigration of differently charged anions into a pit nucleus, and differences in the major alloy component.

Associated articles

Article information

Article type
Paper
Submitted
20 Jan 2015
Accepted
22 Feb 2015
First published
21 Apr 2015

Faraday Discuss., 2015,180, 233-249

Pitting of steam-generator tubing alloys in solutions containing thiosulfate and sulfate or chloride

W. Zhang, A. G. Carcea and R. C. Newman, Faraday Discuss., 2015, 180, 233 DOI: 10.1039/C5FD00008D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements