Comprehensive investigation of the corrosion state of the heat exchanger tubes of steam generators. Part I. General corrosion state and morphology

K. Varga, Z. Németh, A. Szabó, K. Radó, D. Oravetz, Z. Homonnay, J. Schunk, P. Tilky, F. Korösi

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The present work, constituting the first part of a series of two, deals with a systematic investigation of the general corrosion state of 22 heat exchanger tubes originating from different steam generators of the Paks NPP (Hungary). While the passivity of the inner surface of the stainless steel tube specimens was studied by voltammetry, the morphology and chemical composition of the oxide layer formed on the surfaces were analyzed by SEM-EDX method. Based on the measured corrosion characteristics (corrosion rate, thickness and chemical composition of the protective oxide layer) a strong dependence of these parameters on the decontamination history of the steam generators was revealed. It is well documented that the chemical decontamination carried out by a non-regenerative version of the AP-CITROX procedure does exert, on the long run, a detrimental effect on the corrosion resistance of steel surfaces. Therefore, process restrictions and modifications to minimize corrosion damages have be defined.

Original languageEnglish
Pages (from-to)181-190
Number of pages10
JournalJournal of Nuclear Materials
Volume348
Issue number1-2
DOIs
Publication statusPublished - Jan 1 2006

Fingerprint

tube heat exchangers
Tubes (components)
boilers
Steam generators
corrosion
Decontamination
Corrosion
decontamination
Oxides
chemical composition
Steel
Stainless Steel
Voltammetry
Corrosion rate
Chemical analysis
Hungary
oxides
Corrosion resistance
Energy dispersive spectroscopy
Stainless steel

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

Comprehensive investigation of the corrosion state of the heat exchanger tubes of steam generators. Part I. General corrosion state and morphology. / Varga, K.; Németh, Z.; Szabó, A.; Radó, K.; Oravetz, D.; Homonnay, Z.; Schunk, J.; Tilky, P.; Korösi, F.

In: Journal of Nuclear Materials, Vol. 348, No. 1-2, 01.01.2006, p. 181-190.

Research output: Contribution to journalArticle

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