Oxidation kinetics and mechanisms of growth of alumina scale on precipitation-hardened Pt–Al–Cr–Ru alloys
► We examine two alloys having similar compositions but quenched in different media. ► Oxidation at high temperatures results in formation of well-adhering α-Al2O3 scale. ► The growth kinetics obeyed the parabolic law, and the water-quenched samples show slower rate. ► Counter-current diffusion of i...
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| Veröffentlicht in: | Corrosion science 2012-10, Vol.63, p.119-128 |
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| creator | Odusote, J.K. Cornish, L.A. Chown, L.H. |
| description | ► We examine two alloys having similar compositions but quenched in different media. ► Oxidation at high temperatures results in formation of well-adhering α-Al2O3 scale. ► The growth kinetics obeyed the parabolic law, and the water-quenched samples show slower rate. ► Counter-current diffusion of ions within the scale and the substrate control the scale growth.
To understand the mechanisms of oxidation at different conditions, water-quenched and air-cooled Pt84:Al11:Cr3:Ru2 (at.%) samples were oxidised in air between 1150 and 1350°C, for up to 100h. Well-adhering and protective external α-Al2O3 scales, which are non-uniform in thickness, formed. Parabolic scaling kinetics were established, and Pt84:Al11:Cr3:Ru2 (at.%) exhibited slower scale growth rates and lower activation energies, compared to most other Pt-, Ni- and Fe-based superalloys. Mechanisms of α-Al2O3 growth were proposed to be mainly by inward diffusion of oxygen along the oxide grain boundaries, with some outward diffusion of aluminium ions along the short circuit paths, such as pores. |
| doi_str_mv | 10.1016/j.corsci.2012.05.018 |
| format | Article |
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To understand the mechanisms of oxidation at different conditions, water-quenched and air-cooled Pt84:Al11:Cr3:Ru2 (at.%) samples were oxidised in air between 1150 and 1350°C, for up to 100h. Well-adhering and protective external α-Al2O3 scales, which are non-uniform in thickness, formed. Parabolic scaling kinetics were established, and Pt84:Al11:Cr3:Ru2 (at.%) exhibited slower scale growth rates and lower activation energies, compared to most other Pt-, Ni- and Fe-based superalloys. Mechanisms of α-Al2O3 growth were proposed to be mainly by inward diffusion of oxygen along the oxide grain boundaries, with some outward diffusion of aluminium ions along the short circuit paths, such as pores.</description><identifier>ISSN: 0010-938X</identifier><identifier>EISSN: 1879-0496</identifier><identifier>DOI: 10.1016/j.corsci.2012.05.018</identifier><identifier>CODEN: CRRSAA</identifier><language>eng</language><publisher>Kidlington: Elsevier Ltd</publisher><subject>A. Alloy ; A. Platinum ; Alloys ; Aluminum ; Applied sciences ; B. SEM ; B. XRD ; C. Oxidation ; Corrosion ; Corrosion environments ; Diffusion ; Exact sciences and technology ; Grain boundaries ; Metals. Metallurgy ; Oxidation ; Platinum base alloys ; Scale (corrosion) ; Short circuits</subject><ispartof>Corrosion science, 2012-10, Vol.63, p.119-128</ispartof><rights>2012 Elsevier Ltd</rights><rights>2015 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c369t-eec4c841b5d1b6f9f17038f2f0ffda30a66822736c0dee15acf550ace5d517e43</citedby><cites>FETCH-LOGICAL-c369t-eec4c841b5d1b6f9f17038f2f0ffda30a66822736c0dee15acf550ace5d517e43</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.corsci.2012.05.018$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3548,27923,27924,45994</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=26204600$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Odusote, J.K.</creatorcontrib><creatorcontrib>Cornish, L.A.</creatorcontrib><creatorcontrib>Chown, L.H.</creatorcontrib><title>Oxidation kinetics and mechanisms of growth of alumina scale on precipitation-hardened Pt–Al–Cr–Ru alloys</title><title>Corrosion science</title><description>► We examine two alloys having similar compositions but quenched in different media. ► Oxidation at high temperatures results in formation of well-adhering α-Al2O3 scale. ► The growth kinetics obeyed the parabolic law, and the water-quenched samples show slower rate. ► Counter-current diffusion of ions within the scale and the substrate control the scale growth.
To understand the mechanisms of oxidation at different conditions, water-quenched and air-cooled Pt84:Al11:Cr3:Ru2 (at.%) samples were oxidised in air between 1150 and 1350°C, for up to 100h. Well-adhering and protective external α-Al2O3 scales, which are non-uniform in thickness, formed. Parabolic scaling kinetics were established, and Pt84:Al11:Cr3:Ru2 (at.%) exhibited slower scale growth rates and lower activation energies, compared to most other Pt-, Ni- and Fe-based superalloys. Mechanisms of α-Al2O3 growth were proposed to be mainly by inward diffusion of oxygen along the oxide grain boundaries, with some outward diffusion of aluminium ions along the short circuit paths, such as pores.</description><subject>A. Alloy</subject><subject>A. Platinum</subject><subject>Alloys</subject><subject>Aluminum</subject><subject>Applied sciences</subject><subject>B. SEM</subject><subject>B. XRD</subject><subject>C. Oxidation</subject><subject>Corrosion</subject><subject>Corrosion environments</subject><subject>Diffusion</subject><subject>Exact sciences and technology</subject><subject>Grain boundaries</subject><subject>Metals. Metallurgy</subject><subject>Oxidation</subject><subject>Platinum base alloys</subject><subject>Scale (corrosion)</subject><subject>Short circuits</subject><issn>0010-938X</issn><issn>1879-0496</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNp9kMtKxDAUhoMoOF7ewEU3gpvWk7bJtBtBBm8gKKLgLsTkxMnYJmPS8bLzHXxDn8SMIy7dnGTx_f_hfITsUSgoUH44K5QPUdmiBFoWwAqgzRoZ0Wbc5lC3fJ2MACjkbdXcb5KtGGcAkFgYEX_1ZrUcrHfZk3U4WBUz6XTWo5pKZ2MfM2-yx-Bfh-nyJ7tFb53MopIdZik1D6js3A4_HflUBo0OdXY9fH18HndpTEIaN4uU7Px73CEbRnYRd3_fbXJ3enI7Oc8vr84uJseXuap4O-SIqlZNTR-Ypg_ctIaOoWpMacAYLSuQnDdlOa64Ao1ImVSGMZAKmWZ0jHW1TQ5WvfPgnxcYB9HbqLDrpEO_iILWvGYtKyua0HqFquBjDGjEPNhehndBQSz9iplY-RVLvwKYSH5TbP93g1zKMEE6ZeNftuQl1BwgcUcrDtO5LxaDSE3oFGqb1A1Ce_v_om9mn5eT</recordid><startdate>20121001</startdate><enddate>20121001</enddate><creator>Odusote, J.K.</creator><creator>Cornish, L.A.</creator><creator>Chown, L.H.</creator><general>Elsevier Ltd</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QF</scope><scope>7QQ</scope><scope>7SE</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>F28</scope><scope>FR3</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>20121001</creationdate><title>Oxidation kinetics and mechanisms of growth of alumina scale on precipitation-hardened Pt–Al–Cr–Ru alloys</title><author>Odusote, J.K. ; Cornish, L.A. ; Chown, L.H.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c369t-eec4c841b5d1b6f9f17038f2f0ffda30a66822736c0dee15acf550ace5d517e43</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>A. Alloy</topic><topic>A. Platinum</topic><topic>Alloys</topic><topic>Aluminum</topic><topic>Applied sciences</topic><topic>B. SEM</topic><topic>B. XRD</topic><topic>C. Oxidation</topic><topic>Corrosion</topic><topic>Corrosion environments</topic><topic>Diffusion</topic><topic>Exact sciences and technology</topic><topic>Grain boundaries</topic><topic>Metals. Metallurgy</topic><topic>Oxidation</topic><topic>Platinum base alloys</topic><topic>Scale (corrosion)</topic><topic>Short circuits</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Odusote, J.K.</creatorcontrib><creatorcontrib>Cornish, L.A.</creatorcontrib><creatorcontrib>Chown, L.H.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Aluminium Industry Abstracts</collection><collection>Ceramic Abstracts</collection><collection>Corrosion Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Corrosion science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Odusote, J.K.</au><au>Cornish, L.A.</au><au>Chown, L.H.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Oxidation kinetics and mechanisms of growth of alumina scale on precipitation-hardened Pt–Al–Cr–Ru alloys</atitle><jtitle>Corrosion science</jtitle><date>2012-10-01</date><risdate>2012</risdate><volume>63</volume><spage>119</spage><epage>128</epage><pages>119-128</pages><issn>0010-938X</issn><eissn>1879-0496</eissn><coden>CRRSAA</coden><abstract>► We examine two alloys having similar compositions but quenched in different media. ► Oxidation at high temperatures results in formation of well-adhering α-Al2O3 scale. ► The growth kinetics obeyed the parabolic law, and the water-quenched samples show slower rate. ► Counter-current diffusion of ions within the scale and the substrate control the scale growth.
To understand the mechanisms of oxidation at different conditions, water-quenched and air-cooled Pt84:Al11:Cr3:Ru2 (at.%) samples were oxidised in air between 1150 and 1350°C, for up to 100h. Well-adhering and protective external α-Al2O3 scales, which are non-uniform in thickness, formed. Parabolic scaling kinetics were established, and Pt84:Al11:Cr3:Ru2 (at.%) exhibited slower scale growth rates and lower activation energies, compared to most other Pt-, Ni- and Fe-based superalloys. Mechanisms of α-Al2O3 growth were proposed to be mainly by inward diffusion of oxygen along the oxide grain boundaries, with some outward diffusion of aluminium ions along the short circuit paths, such as pores.</abstract><cop>Kidlington</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.corsci.2012.05.018</doi><tpages>10</tpages></addata></record> |
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| ispartof | Corrosion science, 2012-10, Vol.63, p.119-128 |
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| language | eng |
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| source | Elsevier ScienceDirect Journals Complete |
| subjects | A. Alloy A. Platinum Alloys Aluminum Applied sciences B. SEM B. XRD C. Oxidation Corrosion Corrosion environments Diffusion Exact sciences and technology Grain boundaries Metals. Metallurgy Oxidation Platinum base alloys Scale (corrosion) Short circuits |
| title | Oxidation kinetics and mechanisms of growth of alumina scale on precipitation-hardened Pt–Al–Cr–Ru alloys |
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