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

Autor:	D. Oravetz, F. Kőrösi, Andrea Szabó, Kálmán Varga, János Schunk, Krisztián Radó, Zoltán Homonnay, Péter Tilky, Zoltán Németh
Rok vydání:	2006
Předmět:	Nuclear and High Energy Physics Chemistry Metallurgy Passivity Oxide Human decontamination Corrosion chemistry.chemical_compound Nuclear Energy and Engineering Heat exchanger Protective oxide General Materials Science Chemical composition Shell and tube heat exchanger
Zdroj:	Journal of Nuclear Materials. 348:181-190
ISSN:	0022-3115
DOI:	10.1016/j.jnucmat.2005.09.012
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::612adc5da57b0e52692e7b15bd563787 https://doi.org/10.1016/j.jnucmat.2005.09.012 Zobrazit plný text záznamu Full Text from ScienceDirect