Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/49773

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dc.contributor.authorRodrigues, S. P.por
dc.contributor.authorAlves, C. F. Almeidapor
dc.contributor.authorCavaleiro, A.por
dc.contributor.authorCarvalho, S.por
dc.date.accessioned2018-01-26T18:33:43Z-
dc.date.available2018-01-26T18:33:43Z-
dc.date.issued2017-
dc.identifier.issn0169-4332por
dc.identifier.urihttp://hdl.handle.net/1822/49773-
dc.description.abstractThis paper reports on the control of wettability behaviour of a 6000 series aluminum (Al) alloy surface (Al6016-T4), which is widely used in the automotive and aerospace industries. In order to induce the surface micro-nanostructuring of the surface, a combination of prior mechanical polishing steps followed by anodization process with different conditions was used. The surface polishing with sandpaper grit size 1000 promoted aligned grooves on the surface leading to static water contact angle (WCA) of 91◦ and oil (-bromonaphthalene) contact angle (OCA) of 32◦, indicating a slightly hydrophobic and oleophilic character. H2SO4 and H3PO4 acid electrolytes were used to grow aluminum oxide layers (Al2O3) by anodization, working at 15V/18◦ C and 100V/0 ◦C, respectively, in one or two-steps configuration. Overall, the anodization results showed that the structured Al surfaces were hydrophilic and oleophilic-like with both WCA and OCA below 90◦. The one-step configuration led to a dimple-shaped Al alloy surface with small diameter of around 31 nm, in case of H2SO4, and with larger diameters of around 223 nm in case of H3PO4. The larger dimples achieved with H3PO4 electrolyte allowed to reach a slight hydrophobic surface. The thicker porous Al oxide layers, produced by anodization in two-step configuration, revealed that the liquids can penetrate easily inside the non-ordered porous structures and, thus, the surface wettability tended to superhydrophilic and superoleophilic character (CA< 10◦). These results indicate that the capillary-pressure balance model, described for wettability mechanisms of porous structures, was broken. Moreover, thicker oxide layers with narrow pores of about 29 nm diameter allowed to achieve WCA< OCA. This inversion in favour of the hydrophilic-oleophobic surface behaviour is of great interest either for lubrication of mechanical components or in water-oil separation process.por
dc.description.sponsorshipThis research work is supported by FEDER funds through the program COMPETE – Programa Operacional Factores de Competitividade – by national funds through FCT – Fundac¸ ão para a Ciência e a Tecnologia in the framework of the Strategic Funding UID/FIS/04650/2013, UID/EMS/00285/2013 and with a PhD fellowship PD/BD/112079/2015. This work was also sponsored by IAPMEI funds through QREN 38587 2014/2015-CleanTool project, ERA-SIINN/0004/2013-NanoSafeLeather project and PTDC/CTMNAN/4242/2014-ClusterStent project.por
dc.language.isoengpor
dc.publisherElsevierpor
dc.relationinfo:eu-repo/grantAgreement/FCT/5876/147414/PTpor
dc.relationinfo:eu-repo/grantAgreement/FCT/5876/147405/PTpor
dc.relationPD/BD/112079/2015por
dc.relationinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/138552/PTpor
dc.relationPTDC/CTMNAN/4242/2014por
dc.rightsrestrictedAccesspor
dc.subject6000 series aluminum alloyspor
dc.subjectHydro/oleo-philic/phobic behaviourpor
dc.subjectAnodic aluminum oxidespor
dc.subjectMicro-nanostructuringpor
dc.subjectLubricationpor
dc.titleWater and oil wettability of anodized 6016 aluminum alloy surfacepor
dc.typearticlepor
dc.peerreviewedyespor
oaire.citationStartPage430por
oaire.citationEndPage442por
oaire.citationVolume422por
dc.identifier.doi10.1016/j.apsusc.2017.05.204por
dc.description.publicationversioninfo:eu-repo/semantics/publishedVersionpor
dc.subject.wosScience & Technologypor
sdum.journalApplied Surface Sciencepor
Appears in Collections:CDF - GRF - Artigos/Papers (with refereeing)

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