Analysis and TEM examination of corrosion scales grown on Alloy 690 exposed to pressurized water at 325°C

被引:72
作者
Carrette, F
Lafont, MC
Chatainier, G
Guinard, L
Pieraggi, B
机构
[1] ENSIACET, INPT, CNRS, UPS 5085,UMR,CIRIMAT, F-31077 Toulouse 4, France
[2] EDF, Direct Rech, Dept Etud Mat, Moret Sur Loing, France
关键词
Alloy; 690; PWR media; corrosion scale; SIMS; XTEM;
D O I
10.1002/sia.1269
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Corrosion scales grown on Alloy 690 during exposure to pressurized water were examined and analysed by SIMS, scanning electron microscopy (SEM), cross-sectional transmission electron microscopy (XTEM), XPS and x-ray diffraction at grazing incidence. All the corrosion tests were performed in pure water on spark-machined and 1 mum polished specimens at a temperature of 325 degreesC and a pressure of 155 bar. This surface finish results in the formation of a highly defective and thin perturbed zone similar to the standard surface finish of tubes used in pressurized water reactors. Two different testing devices were used: a static autoclave made of stainless steel and a recirculating autoclave made of titanium alloy. Scale thicknesses deduced from XTEM, XPS and SIMS are in good agreement; the average value is similar to50 nm for an exposure of 2160 h. The microstructure of these scales cannot be considered as duplex, as is usually described in the open literature. The scale is formed of a rather continuous and uniform internal Cr-rich thin layer and an external layer, the composition, morphology and microstructure of which depend on the test conditions and test duration. For example, scales grown in the static autoclave contain higher concentrations of Fe and Ni than scales grown in the recirculating titanium alloy autoclave. Copyright (C) 2002 John Wiley Sons, Ltd.
引用
收藏
页码:135 / 138
页数:4
相关论文
共 9 条
[1]   ROLE OF DIFFUSION IN OXIDATION OF MILD STEEL IN HIGH TEMPERATURE AQUEOUS SOLUTIONS [J].
CASTLE, JE ;
MASTERSO.HG .
CORROSION SCIENCE, 1966, 6 (3-4) :93-&
[2]   EVOLUTION OF HYDROGEN FROM FERROUS HYROXIDE [J].
EVANS, UR ;
WANKLYN, JN .
NATURE, 1948, 162 (4105) :27-28
[3]  
GARDEY S, 1998, THESIS U PARIS 6
[4]  
GUINARD L, 1999, HT4599025A EDF
[5]  
Guinard L., 1998, JAIF INT C WAT CHEM
[6]  
GUINARD L, 2000, 8 INT C WAT CHEM NUC
[7]   THE MECHANISM AND KINETICS OF CORROSION PRODUCT RELEASE FROM STAINLESS-STEEL IN LITHIATED HIGH-TEMPERATURE WATER [J].
LISTER, DH ;
DAVIDSON, RD ;
MCALPINE, E .
CORROSION SCIENCE, 1987, 27 (02) :113-140
[8]   THE MECHANISM OF HIGH-TEMPERATURE AQUEOUS CORROSION OF STAINLESS-STEELS [J].
ROBERTSON, J .
CORROSION SCIENCE, 1991, 32 (04) :443-465
[9]  
ROBERTSON J, 1989, 5 INT C WAT CHEM NUC