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Chemical and physical changes at sodium-stainless steel interfaces in fast reactors

Abstract

In the sodium loops of a fast reactor, mass transfer occurs due to the interaction of flowing sodium on stainless steel surfaces. Under the non-isothermal conditions prevailing in the loop some elements are preferentially leached from the surface layers of the hot zone and transported by sodium to the cooled zone where deposition may take place. The available information on the mass transport in non-isothermal sodium loops has been summarised, and an attempt has been made to understand the mechanisms involved, of which the chemical reactions at the sodium-stainless steel interface are especially important. The rate of diffusion towards the solid/liquid interface may be the rate-determining step in some of these reactions. When a ferritic surface layer is formed by the selective removal of austenitic stabilizing elements, diffusion of alloying constituents through the ferritic layer limits the growth of this layer. Only when the surface film is adherent, the diffusion across this layer becomes important. NaCrO/sub 2/, for instance, has poor adherence, and a surface film of this compound may not inhibit further corrosion.
Authors:
Mathews, C K [1] 
  1. Bhabha Atomic Research Centre, Bombay (India). Radiochemistry Div.
Publication Date:
Jan 01, 1977
Product Type:
Conference
Report Number:
CONF-760163-
Reference Number:
AIX-09-381997; ERA-04-001082; EDB-78-124693
Resource Relation:
Conference: Symposium on chemistry and physics of surface of metals and their oxides, Kalpakkam, Tamil Nadu, India, 27 Jan 1976; Related Information: In: Proceedings of the symposium on chemistry and physics of surface of metals and their oxides.
Subject:
36 MATERIALS SCIENCE; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; FAST REACTORS; REACTOR COOLING SYSTEMS; REACTOR MATERIALS; LMFBR TYPE REACTORS; CORROSION; SODIUM; CORROSIVE EFFECTS; SODIUM COOLED REACTORS; STAINLESS STEELS; CORROSION PROTECTION; DIFFUSION; DISSOLUTION; INTERFACES; MASS TRANSFER; OXYGEN; SURFACES; ALKALI METALS; ALLOYS; BREEDER REACTORS; CHEMICAL REACTIONS; CHROMIUM ALLOYS; COOLING SYSTEMS; CORROSION RESISTANT ALLOYS; CRYOGENIC FLUIDS; ELEMENTS; EPITHERMAL REACTORS; FBR TYPE REACTORS; FLUIDS; IRON ALLOYS; IRON BASE ALLOYS; LIQUID METAL COOLED REACTORS; METALS; NONMETALS; REACTOR COMPONENTS; REACTORS; STEELS; 360105* - Metals & Alloys- Corrosion & Erosion; 210500 - Power Reactors, Breeding
OSTI ID:
8543830
Country of Origin:
India
Language:
English
Submitting Site:
INIS
Size:
Pages: 77-90
Announcement Date:
Mar 15, 2013

Citation Formats

Mathews, C K. Chemical and physical changes at sodium-stainless steel interfaces in fast reactors. India: N. p., 1977. Web.
Mathews, C K. Chemical and physical changes at sodium-stainless steel interfaces in fast reactors. India.
Mathews, C K. 1977. "Chemical and physical changes at sodium-stainless steel interfaces in fast reactors." India.
@misc{etde_8543830,
title = {Chemical and physical changes at sodium-stainless steel interfaces in fast reactors}
author = {Mathews, C K}
abstractNote = {In the sodium loops of a fast reactor, mass transfer occurs due to the interaction of flowing sodium on stainless steel surfaces. Under the non-isothermal conditions prevailing in the loop some elements are preferentially leached from the surface layers of the hot zone and transported by sodium to the cooled zone where deposition may take place. The available information on the mass transport in non-isothermal sodium loops has been summarised, and an attempt has been made to understand the mechanisms involved, of which the chemical reactions at the sodium-stainless steel interface are especially important. The rate of diffusion towards the solid/liquid interface may be the rate-determining step in some of these reactions. When a ferritic surface layer is formed by the selective removal of austenitic stabilizing elements, diffusion of alloying constituents through the ferritic layer limits the growth of this layer. Only when the surface film is adherent, the diffusion across this layer becomes important. NaCrO/sub 2/, for instance, has poor adherence, and a surface film of this compound may not inhibit further corrosion.}
place = {India}
year = {1977}
month = {Jan}
}