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dc.contributor.authorTroughton, SCen
dc.contributor.authorNominé, Aen
dc.contributor.authorDean, Jamesen
dc.contributor.authorClyne, Billen
dc.date.accessioned2016-09-07T09:51:22Z
dc.date.available2016-09-07T09:51:22Z
dc.date.issued2016-07-19en
dc.identifier.issn0169-4332
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/259990
dc.description.abstractShort duration (~1 s) PEO treatments have been applied to aluminium alloy samples on which coatings of thickness ~100 $\mu$m had previously been created. This was done using the small area electrical monitoring system previously developed in the Gordon Laboratory in Cambridge. Voltage supply frequencies of 50 Hz and 2.5 kHz were employed. Fairly high resolution SEM micrographs were taken, covering the whole surface of small area samples (ie over a circular area of diameter about 0.9 mm). This was done both before and after the 1 s PEO treatments. X-ray tomographic data were also obtained in the vicinity of a recently-completed set of discharges. The outcomes of these observations were correlated with synchronised high speed electrical monitoring and video photography, carried out during the PEO treatment periods. Localised cascades (comprising hundreds of individual discharges) were observed in all cases, persisting throughout the 1 s periods and also reappearing in the same location when a second 1 s PEO treatment was applied to the same sample. This repetition of discharges at the same location is apparently due to the deep pores associated with these sites, creating a pathway of low electrical resistance, even after appreciable oxidation has occurred in the vicinity. Observations were made of the way in which the surfaces were reconstructed locally as discharge cascades occurred. With the high frequency voltage supply, discharge lifetimes were limited to the half-cycle period (of 200 $\mu$s), but in other respects the cascades were similar to those with the lower frequency. However, some discharges occurred during cathodic half-cycles with the high frequency supply, at the same location as the anodic discharges in the cascade concerned.
dc.description.sponsorshipEngineering and Physical Sciences Research Council (Grant ID: EP/I001174/1), Sims Scholarship, Keronite plc, Fundacion Banco Santander (Research Mobility Scholarship)
dc.languageEnglishen
dc.language.isoenen
dc.publisherElsevier
dc.rightsAttribution 4.0 International*
dc.rightsAttribution 4.0 Internationalen
dc.rightsAttribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectplasma electrolytic oxidationen
dc.subjectelectrical dischargeen
dc.subjecthigh speed photographyen
dc.subjectX-ray tomographyen
dc.subjectmicrostructureen
dc.titleEffect of individual discharge cascades on the microstructure of plasma electrolytic oxidation coatingsen
dc.typeArticle
dc.description.versionThis is the final version of the article. It first appeared from Elsevier via http://dx.doi.org/10.1016/j.apsusc.2016.07.106en
prism.endingPage269
prism.publicationDate2016en
prism.publicationNameApplied Surface Scienceen
prism.startingPage260
prism.volume389en
dc.identifier.doi10.17863/CAM.4216
dcterms.dateAccepted2016-07-16en
rioxxterms.versionofrecord10.1016/j.apsusc.2016.07.106en
rioxxterms.versionVoRen
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/en
rioxxterms.licenseref.startdate2016-07-19en
dc.contributor.orcidClyne, Bill [0000-0003-2163-1840]
dc.identifier.eissn1873-5584
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idEPSRC (EP/I001174/1)
cam.orpheus.successThu Jan 30 12:57:27 GMT 2020 - The item has an open VoR version.*
rioxxterms.freetoread.startdate2100-01-01


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Attribution 4.0 International
Except where otherwise noted, this item's licence is described as Attribution 4.0 International