Studies of the Corrosion Properties of Ni-Cr-Mo-Gd Neutron-Absorbing Alloys

Lister, Tedd E.; Mizia, R.E.; Pinhero, P. J.; Trowbridge, Tammy L.; Delezene-Briggs, Karen M.

doi:10.5006/1.3278205

Cited by 24 publications

(16 citation statements)

References 4 publications

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“…The particles dissolved preferentially in the hot concentrated brine leaving behind the more corrosion resistant Ni-Cr-Mo matrix. This phenomenon has been reported before [16]. It has also been reported that if a second consecutive scan is carried out using a pre-corroded Ni-Gd specimen, lower current densities will be measured for this second scan because the Ni 5 Gd particles already dissolved in the first scan and the remaining matrix is more resistant to polarization and corrosion [16].…”

Section: Anodic Potentiodynamic Polarizationmentioning

confidence: 74%

Enhanced Corrosion Resistance of Iron-Based Amorphous Alloys

Rebak

Day

Lian

et al. 2007

Volume 7: Operations, Applications and Components

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Iron-based amorphous alloys possess enhanced hardness and are highly resistant to corrosion, which make them desirable for wear applications in corrosive environments. It was of interest to examine the behavior of amorphous alloys during anodic polarization in concentrated salt solutions and in the salt-fog testing. Results from the testing of one amorphous material (SAM2X5) both in ribbon form and as an applied coating are reported here. Cyclic polarization tests were performed on SAM2X5 ribbon as well as on other nuclear engineering materials. SAM2X5 showed the highest resistance to localized corrosion in 5 M CaCl 2 solution at 105°C. Salt fog tests of 316L SS and Alloy 22 coupons coated with amorphous SAM2X5 powder showed resistance to rusting. Partial devitrification may be responsible for isolated pinpoint rust spots in some coatings.

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Section: Anodic Potentiodynamic Polarizationmentioning

confidence: 74%

Enhanced Corrosion Resistance of Iron-Based Amorphous Alloys

Rebak

Day

Lian

et al. 2007

Volume 7: Operations, Applications and Components

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“…It is possible that the corrosion rate of the secondary phase has a different corrosion rate dependence on environment than the base material. The corrosion rates obtained by LPR for Alloy 22 are about two orders of magnitude higher than the rates (slightly different environments) obtained by exposure testing for Alloy 22 (see Reference 19,[6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. One explanation for the discrepancies between the two measurement methods might be the higher rates for a material immediately following immersion.…”

Section: Discussion Of Resultsmentioning

confidence: 95%

“…2 The metallurgical development process and corrosion performance of this material has been reported previously. [3][4][5][6][7][8] This material has an austenitic microstructure with a eutectic second phase of the form Ni 5 Gd, which is called a gadolinide. The size, shape, and distribution of the gadolinide in the plate product are controlled by alloy chemistry, primary and secondary melting/refining, and thermomechanical processing.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Testing of Ni-Cr-Mo-Gd Alloys

Lister¹,

Mizia²,

Tian³

2005

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The waste package site recommendation design specified a boron-containing stainless steel, Neutronit 976/978, for fabrication of the internal baskets that will be used as a corrosion-resistant neutron-absorbing material. Recent corrosion test results gave higher-than-expected corrosion rates for this material. The material callout for these components has been changed to a Ni-Cr-Mo-Gd alloy (ASTM-B 932-04, UNS N06464) that is being developed at the Idaho National Laboratory.This report discusses the results of initial corrosion testing of this material in simulated in-package environments that could contact the fuel baskets after breach of the waste package outer barrier. The corrosion test matrix was executed using the potentiodynamic and potentiostatic electrochemical test techniques. The alloy performance shows low rates of general corrosion after initial removal of a gadolinium-rich second phase that intersects the surface. The high halide-containing test solutions exhibited greater tendencies toward initiation of crevice corrosion.

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“…Therefore, the initial corrosion rate for the Ni-Cr-Mo-Gd material is determined by the very reactive gadolinide secondary phase. 31 This apparent general-corrosion rate was several orders-of-magnitude higher than for the 304B4, Grade A material. The secondary-phase (FeCr) 2 B of the borated stainless steel appears to be stable, likely due to the high Cr content; thus, it does not contribute to the corrosion directly.…”

Section: Discussionmentioning

confidence: 99%