Kinetics and mechanisms of nickel metal dusting I: Kinetics and morphology Zhang, Jianqiang en_US Young, David en_US 2021-11-25T13:14:40Z 2021-11-25T13:14:40Z 2007 en_US
dc.description.abstract The kinetics of nickel metal dusting were investigated at different gas compositions at 680 °C. The carbon uptake rate on nickel exposed to supersaturated H<sub>2</sub>/CO/H<sub>2</sub>O gas mixtures (nominal a<sub>C</sub> = 19) increased as p<sub>CO</sub> increased from 0.31 to 0.68 atm, but decreased with further increase in p<sub>CO</sub>. This behaviour was ascribed to the existence of parallel, independent reaction paths, and the rate was well described byRate = k<sub>1</sub> p<sub>CO</sub> p<sub>H2</sub> + k<sub>2</sub> p<sub>CO</sub><sup>2</sup> - k<sub>3</sub> p<sub>H2</sub><sup>2</sup>where the k<sub>i</sub> are constants. Examination of reacted cross-sections showed that general coke layer formation at the nickel surface was accompanied by internal precipitation of graphite along grain boundaries deep inside the nickel. The internal precipitation reflected the large grain of the nickel. Prior cold working of the surface caused its recrystallisation, which affected carbon deposition and coke morphology. The carbon morphologies formed on the sample surface could generally be classified as bulk graphite, carbon filaments and graphite particle clusters. Carbon filaments were nanoscale in size, and uniform. The particles in the graphite particle clusters were relatively large (0.1-2.5 ìm) and non-uniform. The morphological development of the carbon deposit differed from one sub-grain to another. © 2006 Elsevier Ltd. All rights reserved. en_US
dc.language English
dc.language.iso EN en_US
dc.rights CC BY-NC-ND 3.0 en_US
dc.rights.uri en_US
dc.source Legacy MARC en_US
dc.subject.other Nickel en_US
dc.subject.other Surface treatment en_US
dc.subject.other Reaction kinetics en_US
dc.subject.other Morphology en_US
dc.subject.other Composition en_US
dc.subject.other Precipitation (chemical) en_US
dc.subject.other Graphite en_US
dc.title Kinetics and mechanisms of nickel metal dusting I: Kinetics and morphology en_US
dc.type Journal Article en
dcterms.accessRights metadata only access
dspace.entity.type Publication en_US
unsw.identifier.doiPublisher en_US
unsw.relation.faculty Science
unsw.relation.ispartofissue 3 en_US
unsw.relation.ispartofjournal Corrosion Science en_US
unsw.relation.ispartofpagefrompageto 1496-1512 en_US
unsw.relation.ispartofvolume 49 en_US
unsw.relation.originalPublicationAffiliation Zhang, Jianqiang, Materials Science & Engineering, Faculty of Science, UNSW en_US
unsw.relation.originalPublicationAffiliation Young, David, Materials Science & Engineering, Faculty of Science, UNSW en_US School of Materials Science & Engineering *
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