Hydrogen Diffusion And Permeation In Micro- And Nanocrystalline Nickel

dc.creatorArantes D.R.
dc.creatorHuang X.Y.
dc.creatorMarte C.
dc.creatorKirchheim R.
dc.date1993
dc.date2015-06-30T14:32:55Z
dc.date2015-11-26T14:43:51Z
dc.date2015-06-30T14:32:55Z
dc.date2015-11-26T14:43:51Z
dc.date.accessioned2018-03-28T21:52:15Z
dc.date.available2018-03-28T21:52:15Z
dc.identifier
dc.identifierActa Metallurgica Et Materialia. , v. 41, n. 11, p. 3215 - 3222, 1993.
dc.identifier9567151
dc.identifier10.1016/0956-7151(93)90051-S
dc.identifierhttp://www.scopus.com/inward/record.url?eid=2-s2.0-0027697870&partnerID=40&md5=f9ed8b5f6abbe3fc313baa164d82ef4b
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/99808
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/99808
dc.identifier2-s2.0-0027697870
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1251866
dc.descriptionElectrochemical studies with nanocrystalline nickel (grain size ≈ 100 nm) have shown that hydrogen permeation is remarkably larger in comparison with microcrystalline nickel (grain size ≈ 2 μm). This is due to an increase of both hydrogen solubility and hydrogen diffusivity. The latter quantity increases by two orders of magnitude when the hydrogen activity is enlarged. However, measurements of the time lag during transient permeation show that at very low hydrogen activities the diffusion coefficient can be smaller when compared to a microcrystalline sample. For small cathodic current densities (< 10 μA/cm2) all of the produced hydrogen is absorbed in atomic form by the sample whereas for large current densities the overwhelming part of the electric charge is consumed for the formation of gaseous hydrogen according to the Volmer-Tafel mechanism. The results are explained in the framework of a model used for hydrogen diffusion in defective and disordered materials. © 1993.
dc.description41
dc.description11
dc.description3215
dc.description3222
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dc.languageen
dc.publisher
dc.relationActa Metallurgica Et Materialia
dc.rightsfechado
dc.sourceScopus
dc.titleHydrogen Diffusion And Permeation In Micro- And Nanocrystalline Nickel
dc.typeArtículos de revistas


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