Stress Corrosion Cracking of Alloy 625 in pH 2 Aqueous Solution at High Temperature and Pressure
Identifieur interne : 000350 ( Main/Exploration ); précédent : 000349; suivant : 000351Stress Corrosion Cracking of Alloy 625 in pH 2 Aqueous Solution at High Temperature and Pressure
Auteurs : H. Kim [Maroc] ; D. B. Mitton ; R. M. Latanision [Maroc]Source :
- Corrosion : (Houston, Tex.) [ 0010-9312 ] ; 2011.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Corrosion.
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Abstract
Stress corrosion cracking (SCC) of Alloy 625 (UNS N06625) has been investigated in pH 2 aqueous solution at high temperatures (300°C to 426°C) and high pressure (24.1 MPa) to understand the corrosion behavior in supercritical water oxidation (SCWO) systems, which can destroy aqueous organic wastes with high efficiency with no harmful byproducts. Alloy 625 was exposed to 11 operational (chemical, thermal, pressure) cycles. SCC at subcritical temperature comes from the chemical stability of the elements, which produces a dealloyed oxide layer where Ni is selectively dissolved and Cr forms stable oxides. Its growth is accelerated along the grain boundaries, where SCC develops during the operational cycles. As a result of the defective dealloyed oxide layer structure, the diffusivity of Ni is fast, intermediate between the surface and grain boundary diffusivities. SCC at supercritical temperature comes from the direct chemical attack of associated hydrochloric acid (HCl) molecules.
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">Stress Corrosion Cracking of Alloy 625 in pH 2 Aqueous Solution at High Temperature and Pressure</title><author><name sortKey="Kim, H" sort="Kim, H" uniqKey="Kim H" first="H." last="Kim">H. Kim</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>MIT, Department of Materials Science and Engineering, 77 Massachusetts Ave.</s1><s2>Cambridge</s2><s3>MAR</s3><sZ>1 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Maroc</country><wicri:noRegion>Cambridge</wicri:noRegion></affiliation></author><author><name sortKey="Mitton, D B" sort="Mitton, D B" uniqKey="Mitton D" first="D. B." last="Mitton">D. B. Mitton</name></author><author><name sortKey="Latanision, R M" sort="Latanision, R M" uniqKey="Latanision R" first="R. M." last="Latanision">R. M. 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Kim</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>MIT, Department of Materials Science and Engineering, 77 Massachusetts Ave.</s1><s2>Cambridge</s2><s3>MAR</s3><sZ>1 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Maroc</country><wicri:noRegion>Cambridge</wicri:noRegion></affiliation></author><author><name sortKey="Mitton, D B" sort="Mitton, D B" uniqKey="Mitton D" first="D. B." last="Mitton">D. B. Mitton</name></author><author><name sortKey="Latanision, R M" sort="Latanision, R M" uniqKey="Latanision R" first="R. M." last="Latanision">R. M. Latanision</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>MIT, Department of Materials Science and Engineering, 77 Massachusetts Ave.</s1><s2>Cambridge</s2><s3>MAR</s3><sZ>1 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Maroc</country><wicri:noRegion>Cambridge</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Corrosion : (Houston, Tex.)</title><title level="j" type="abbreviated">Corrosion : (Houst., Tex.)</title><idno type="ISSN">0010-9312</idno><imprint><date when="2011">2011</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Corrosion : (Houston, Tex.)</title><title level="j" type="abbreviated">Corrosion : (Houst., Tex.)</title><idno type="ISSN">0010-9312</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Aqueous solution</term><term>Corrosion</term><term>Dealloying</term><term>High temperature</term><term>Hydrochloric acid</term><term>Nickel base alloys</term><term>Oxidation</term><term>Stress corrosion cracking</term><term>Temperature</term><term>pH</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Fissuration corrosion sous tension</term><term>Corrosion</term><term>Alliage base nickel</term><term>pH</term><term>Solution aqueuse</term><term>Haute température</term><term>Température</term><term>Désalliage</term><term>Acide chlorhydrique</term><term>Oxydation</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Corrosion</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Stress corrosion cracking (SCC) of Alloy 625 (UNS N06625) has been investigated in pH 2 aqueous solution at high temperatures (300°C to 426°C) and high pressure (24.1 MPa) to understand the corrosion behavior in supercritical water oxidation (SCWO) systems, which can destroy aqueous organic wastes with high efficiency with no harmful byproducts. Alloy 625 was exposed to 11 operational (chemical, thermal, pressure) cycles. SCC at subcritical temperature comes from the chemical stability of the elements, which produces a dealloyed oxide layer where Ni is selectively dissolved and Cr forms stable oxides. Its growth is accelerated along the grain boundaries, where SCC develops during the operational cycles. As a result of the defective dealloyed oxide layer structure, the diffusivity of Ni is fast, intermediate between the surface and grain boundary diffusivities. SCC at supercritical temperature comes from the direct chemical attack of associated hydrochloric acid (HCl) molecules.</div></front></TEI><affiliations><list><country><li>Maroc</li></country></list><tree><noCountry><name sortKey="Mitton, D B" sort="Mitton, D B" uniqKey="Mitton D" first="D. B." last="Mitton">D. B. Mitton</name></noCountry><country name="Maroc"><noRegion><name sortKey="Kim, H" sort="Kim, H" uniqKey="Kim H" first="H." last="Kim">H. Kim</name></noRegion><name sortKey="Latanision, R M" sort="Latanision, R M" uniqKey="Latanision R" first="R. M." last="Latanision">R. M. Latanision</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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