Alkaline dissolution of aluminum: surface chemistry and subsurface interfacial phenomena

dc.contributor.advisor Kurt R. Hebert
dc.contributor.advisor Andrew C. Hillier
dc.contributor.advisor Monica H. Lamm
dc.contributor.author Adhikari, Saikat
dc.contributor.department Chemical and Biological Engineering
dc.date 2018-08-22T15:10:32.000
dc.date.accessioned 2020-06-30T07:47:32Z
dc.date.available 2020-06-30T07:47:32Z
dc.date.copyright Tue Jan 01 00:00:00 UTC 2008
dc.date.issued 2008-01-01
dc.description.abstract <p>In this dissertation, direct imaging of interfacial voids formed in aluminum during alkaline dissolution was attempted, using TEM and STEM. Additional microscopic observations by FE-SEM are reported, following removal of controlled depths of metal to expose subsurface voids. Information obtained from the microscopy about depths, geometry and number densities of voids in the metal is analyzed with respect to logistics of a void formation mechanism involving vacancy diffusion at room temperature. The second part of the work deals with studies on hydrogen interactions with aluminum during alkaline dissolution processes using the DS cell and Al/Pd bilayer films. The change in the electrochemical potential on hydrogen entry and exit side was monitored and used to calculate the chemical potential of hydrogen in equilibrium with the aluminum. The calculated H-chemical potential is used to quantitatively characterize the thermodynamic conditions of H in aluminum and its implications for H-absorption and H-vacancy defect formation is discussed. Additionally, surface chemical processes accompanying anodic and open circuit alkaline dissolution were studies using SIMS, AFM, cyclic voltammetry and potential-step experiments. These surface analytical and electrochemical techniques identified the presence of surface hydride on aluminum during dissolution. The potential at the metal-film interface was found to correspond with the Nernst potential for aluminum hydride dissolution.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/15828/
dc.identifier.articleid 16827
dc.identifier.contextkey 7045158
dc.identifier.doi https://doi.org/10.31274/rtd-180813-17031
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/15828
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/69499
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/15828/3316184.PDF|||Fri Jan 14 20:47:17 UTC 2022
dc.subject.disciplines Chemical Engineering
dc.subject.keywords Chemical and biological engineering;Chemical engineering
dc.title Alkaline dissolution of aluminum: surface chemistry and subsurface interfacial phenomena
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication 86545861-382c-4c15-8c52-eb8e9afe6b75
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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