Semiconducting properties of passive films formed on nickel–base alloys type Alloy 600: influence of the alloying elements
Identifieur interne : 000B85 ( Main/Exploration ); précédent : 000B84; suivant : 000B86Semiconducting properties of passive films formed on nickel–base alloys type Alloy 600: influence of the alloying elements
Auteurs : M. Da Cunha Belo [Portugal] ; N. E Hakiki [Algérie] ; M. G. S Ferreira [Portugal]Source :
- Electrochimica Acta [ 0013-4686 ] ; 1999.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
The semiconducting properties of passive films formed on nickel–base alloys type Alloy 600 in borate buffer solution were studied by capacitance measurements and photoelectrochemistry. The influence of the alloying elements (Fe, Ni, Cr) on the film properties was examined using pure metals and pure alloys. The results obtained show that the presence of both chromium and mixed nickel–iron oxides in the films revealed by quantitative analysis develops a p-n heterojunction that controls their electronic structure, in a similar manner to the case of stainless steels. The nickel oxide present in the films acts as a barrier layer that confers improved protection. The relationship between the electronic structure and the physicochemical properties of the passive film are discussed.
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DOI: 10.1016/S0013-4686(98)00372-7
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S Ferreira</name><affiliation wicri:level="1"><country xml:lang="fr">Portugal</country><wicri:regionArea>Departamento Engenharia Quı́mica, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa</wicri:regionArea><wicri:noRegion>1049-001 Lisboa</wicri:noRegion></affiliation><affiliation wicri:level="1"><country wicri:rule="url">Portugal</country></affiliation></author></analytic><monogr></monogr><series><title level="j">Electrochimica Acta</title><title level="j" type="abbrev">EA</title><idno type="ISSN">0013-4686</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1999">1999</date><biblScope unit="volume">44</biblScope><biblScope unit="issue">14</biblScope><biblScope unit="page" from="2473">2473</biblScope><biblScope unit="page" to="2481">2481</biblScope></imprint><idno type="ISSN">0013-4686</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0013-4686</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>AES</term><term>Chemical composition</term><term>Chromium Alloys</term><term>Experimental study</term><term>Iron Alloys</term><term>Nickel base alloys</term><term>Oxide layer</term><term>Passivation</term><term>Photoelectrochemistry</term><term>Semiconductivity</term><term>Thin films</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>7361a</term><term>Alliage 600</term><term>Alliage base nickel</term><term>Chrome Alliage</term><term>Composition chimique</term><term>Couche mince</term><term>Couche oxyde</term><term>Etude expérimentale</term><term>Fer Alliage</term><term>Passivation</term><term>Photoélectrochimie</term><term>Semiconductivité</term><term>Spectrométrie Auger</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The semiconducting properties of passive films formed on nickel–base alloys type Alloy 600 in borate buffer solution were studied by capacitance measurements and photoelectrochemistry. The influence of the alloying elements (Fe, Ni, Cr) on the film properties was examined using pure metals and pure alloys. The results obtained show that the presence of both chromium and mixed nickel–iron oxides in the films revealed by quantitative analysis develops a p-n heterojunction that controls their electronic structure, in a similar manner to the case of stainless steels. The nickel oxide present in the films acts as a barrier layer that confers improved protection. The relationship between the electronic structure and the physicochemical properties of the passive film are discussed.</div></front></TEI><affiliations><list><country><li>Algérie</li><li>Portugal</li></country></list><tree><country name="Portugal"><noRegion><name sortKey="Da Cunha Belo, M" sort="Da Cunha Belo, M" uniqKey="Da Cunha Belo M" first="M" last="Da Cunha Belo">M. 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