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dc.contributor.author
Gonzalez, Magalí Estefanía  
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Kappes, Mariano Alberto  
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Rodríguez, Martín Alejandro  
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Bozzano, Patricia Beatriz  
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Carranza, Ricardo Mario  
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Rebak, Raul Basilio  
dc.date.available
2021-07-14T18:36:14Z  
dc.date.issued
2018-02  
dc.identifier.citation
Gonzalez, Magalí Estefanía; Kappes, Mariano Alberto; Rodríguez, Martín Alejandro; Bozzano, Patricia Beatriz; Carranza, Ricardo Mario; et al.; Optimization of the double loop electrochemical potentiokinetic reactivation method for detecting sensitization of nickel alloy 690; NACE International; Corrosion; 74; 2; 2-2018; 210-224  
dc.identifier.issn
0010-9312  
dc.identifier.uri
http://hdl.handle.net/11336/136142  
dc.description.abstract
Nickel alloy 690 (UNS N06690) is one of the current choices for nuclear power plant steam generator tubing. The severity of certain stress corrosion cracking submodes in Ni-Cr-Fe alloys, such as Alloy 690, may be a function of the alloy sensitization condition. Sensitization results from chromium carbide precipitation at or near grain boundaries when the alloy is exposed to temperatures from 500°C to 800°C, which causes local chromium depletion in the adjacent matrix. The objective of this work was to study the parameters that control the double loop electrochemical potentiokinetic reactivation (DL-EPR) method and to develop an optimized test routine for Alloy 690. Alloy 690 specimens were tested under different thermal treatments, tailored to obtain a variety of concentrations of chromium in solid solution near the grain boundary (GB) region. The DL-EPR method was applied to Alloy 690 in solutions with different concentrations of sulfuric acid and potassium thiocyanate, at 30°C and 50°C. The optimal condition for detecting sensitization of Alloy 690 was 0.5 M H2SO4 + 0.001 M KSCN, at 30°C. Optical micrographs confirmed an intergranular type of attack under thermally aged (sensitized) conditions. The ratio of the reactivation to the activation peak intensities (Ir/Ia) obtained in the DL-EPR test agreed well with mass loss obtained in boiling nitric acid solution with Cr(VI) additions (modified Huey test). Chromium depletion profiles near the GB of thermally treated specimens under different conditions were measured with the energy dispersive x-ray spectroscopy technique, performed on a transmission electron microscope. A model available in the literature was fitted to those results. The Ir/Ia ratio for Alloy 690, obtained when using the optimal DL-EPR testing conditions, correlated well with the Cr depletion zone width and depth near the GB.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
NACE International  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
ALLOY 690  
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DOUBLE LOOP ELECTROCHEMICAL POTENTIOKINETIC REACTIVATION  
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INTERGRANULAR CORROSION  
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SENSITIZATION  
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STEAM GENERATOR  
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UNS N06690  
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Otras Ingeniería de los Materiales  
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Ingeniería de los Materiales  
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INGENIERÍAS Y TECNOLOGÍAS  
dc.title
Optimization of the double loop electrochemical potentiokinetic reactivation method for detecting sensitization of nickel alloy 690  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2021-07-05T14:35:24Z  
dc.journal.volume
74  
dc.journal.number
2  
dc.journal.pagination
210-224  
dc.journal.pais
Estados Unidos  
dc.journal.ciudad
Houston  
dc.description.fil
Fil: Gonzalez, Magalí Estefanía. Comisión Nacional de Energía Atómica. Gerencia de Área de Energía Nuclear. Gerencia Materiales; Argentina. Universidad Nacional de San Martín. Instituto Sabato; Argentina  
dc.description.fil
Fil: Kappes, Mariano Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia de Área de Energía Nuclear. Gerencia Materiales; Argentina. Universidad Nacional de San Martín. Instituto Sabato; Argentina  
dc.description.fil
Fil: Rodríguez, Martín Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Gerencia de Área de Energía Nuclear. Gerencia Materiales; Argentina. Universidad Nacional de San Martín. Instituto Sabato; Argentina  
dc.description.fil
Fil: Bozzano, Patricia Beatriz. Comisión Nacional de Energía Atómica. Gerencia de Área de Energía Nuclear. Gerencia Materiales; Argentina. Universidad Nacional de San Martín. Instituto Sabato; Argentina  
dc.description.fil
Fil: Carranza, Ricardo Mario. Comisión Nacional de Energía Atómica. Gerencia de Área de Energía Nuclear. Gerencia Materiales; Argentina. Universidad Nacional de San Martín. Instituto Sabato; Argentina  
dc.description.fil
Fil: Rebak, Raul Basilio. General Electric Global Research; Estados Unidos  
dc.journal.title
Corrosion  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://corrosionjournal.org/doi/10.5006/2562  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.5006/2562