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Effect of Environmental Variables on Crevice Corrosion Susceptibility of Ni–Cr–Mo Alloys for Nuclear Repositories

Published on Jan 1, 2015in Procedia Materials Science
· DOI :10.1016/j.mspro.2015.04.043
Edgar C. Hornus2
Estimated H-index: 2
,
Martín A. Rodríguez5
Estimated H-index: 5
+ 2 AuthorsRaul B. Rebak19
Estimated H-index: 19
(GE: General Electric)
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Abstract
The crevice corrosion repassivation potential was determined by the Potentiodynamic–Galvanostatic-Potentiodynamic (PD–GS–PD) method. Alloys 625, C–22, C–22HS and HYBRID–BC1 were used. Specimens contained 24 artificially creviced spots formed by a ceramic washer (crevice former) wrapped with a PTFE tape. Crevice corrosion tests were performed in 0.1 mol/L and 1 mol/L NaCl solutions at temperatures between 20 and 90 °C, and CaCl2 5 mol/L solution at temperatures between 20 and 117 °C. The crevice corrosion resistance of the alloys increased in the following order: 625 < C–22 < C–22HS < HYBRID–BC1. The repassivation potential (ECO) showed the following relationship with temperature (T) and chloride concentration ([Cl−]) ECO = (a + b T) log [Cl−] + c T + d; where a, b, c and d are constants. At temperatures above 90 °C, ECO for alloy 625 stabilized at a minimum value of –0.26 VSCE.
  • References (13)
  • Citations (1)
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References13
Newest
Published on Aug 1, 2012in Electrochimica Acta5.38
Natalia S. Zadorozne2
Estimated H-index: 2
,
C. Mabel Giordano4
Estimated H-index: 4
+ 2 AuthorsRaul B. Rebak19
Estimated H-index: 19
(GE: General Electric)
Abstract The crevice corrosion kinetics of alloys C-22, C-22HS and HYBRID-BC1 was studied in several chloride solutions at 90 °C. The crevice corrosion resistance of the alloys increased with PREN (Pitting Resistance Equivalent Number), which is mainly affected by the Mo content in the alloys. The crevice corrosion kinetics of the three alloys was analyzed at potentials slightly higher than the repassivation potential. Crevice propagation was controlled by ohmic drop in the more dilute chloride ...
Published on Nov 1, 2008in Corrosion1.86
A.K. Mishra10
Estimated H-index: 10
,
G. S. Frankel44
Estimated H-index: 44
Abstract The resistance of Alloy 22 (UNS N06022) to crevice corrosion in aggressive environments was studied using various modifications of the Tsujikawa-Hisamatsu Electrochemical (THE) technique. ...
Published on Dec 1, 2005in Corrosion Science6.36
J.R. Galvele1
Estimated H-index: 1
Abstract The critical potentials for pitting are reviewed, under the scope of their relation with the crevice corrosion mechanism. A short review of the correlation between pitting corrosion and crevice corrosion with the Tafel’s law is made. Some problems observed in the mechanistic description of crevice corrosion are pointed out. The use of Tafel’s law measurements in the understanding of the mechanism of pitting is also mentioned.
Published on Nov 30, 2004
Z. Szklarska-Smialowska1
Estimated H-index: 1
Published on Jan 1, 2003
Kenneth J. Evans4
Estimated H-index: 4
(LLNL: Lawrence Livermore National Laboratory),
S. Daniel Day4
Estimated H-index: 4
(LLNL: Lawrence Livermore National Laboratory)
+ 6 AuthorsRaul B. Rebak19
Estimated H-index: 19
(LLNL: Lawrence Livermore National Laboratory)
Alloy 22 (UNS N60622) is a nickel-based alloy, which is extensively used in aggressive industrial applications, especially due to its resistance to localized corrosion and stress corrosion cracking in high chloride environments. The purpose of this work was to characterize the anodic behavior of Alloy 22 in concentrated calcium chloride (CaCl{sub 2}) brines and to evaluate the inhibitive effect of nitrate, especially to localized corrosion. Standard electrochemical tests such as polarization res...
Published on Oct 1, 2002in Corrosion1.86
G. M. Gordon1
Estimated H-index: 1
Abstract The designated site for a high-level radioactive waste geologic repository at Yucca Mountain is located approximately 100 miles northwest of Las Vegas, Nevada, on the western boundary of the U.S. Department of Energy (DOE) Nevada Test Site in a sparsely populated rural desert area. A crucial element of the potential repository is to contain the radioactive waste and keep it dry within emplaced waste packages for a sufficient time so that the resultant annual dose for a reasonably maxima...
Published on Sep 1, 2002in Comptes Rendus Physique2.89
Jean-Marie Gras1
Estimated H-index: 1
Abstract Traditionally, the corrosion behaviour of container materials can be predicted by extrapolation from relatively short-term experiments. Approaches to life prediction are described for two kinds of materials: carbon steel (corrosion allowance material) which must resist general corrosion, and passive materials (corrosion-resistant materials) which may suffer localized corrosion phenomena (pitting and crevice corrosion). The current theoretical and empirical basis for extrapolating the be...
Published on Mar 29, 2000
Robert W. Cahn27
Estimated H-index: 27
,
P. Haasen13
Estimated H-index: 13
,
E. J. Kramer13
Estimated H-index: 13
Published on Jan 1, 1985
Joubert J2
Estimated H-index: 2
,
M. J. Joubert2
Estimated H-index: 2
,
Lombaard Cm2
Estimated H-index: 2
Summaly The incidence of cysticercosis in South Africa may . weIbeaIarmiIlg. Cysticercosis of the central nervous ,System (CNS) is almost exclusively confined 10 the parenchyma Of the brain. Before the introduction at c:omputed tomography (CT), invasion of the CNS by the parasite could only be suspected on the basis of evidence of previous infestation. The use of ~ in the treatment of cysticercosis is a major step towards eradicating the disease" but to be eIfective treatment must take cognizan,...
Cited By1
Newest
Published on Sep 1, 2018in Electrochimica Acta5.38
Jeffrey D. Henderson5
Estimated H-index: 5
(UWO: University of Western Ontario),
N. Ebrahimi8
Estimated H-index: 8
(UWO: University of Western Ontario)
+ 3 AuthorsJ.J. Noël14
Estimated H-index: 14
(UWO: University of Western Ontario)
Abstract Coupling of metal oxidation in crevice corrosion to both O 2 reduction on surfaces external to the crevice and H + reduction occurring within the crevice, was studied using a galvanostatic crevice corrosion technique in conjunction with weight loss analyses. Results suggest internal H + reduction is a significant contributor to the crevice corrosion of the studied alloys in 5 M NaCl at 120 °C. Repeat experiments suggest damage can be as much as doubled by H + reduction. This process, ho...