{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/69794"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/69794","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Study of Single Corrosion Pits on Aluminum in Chloride Media","abstract":"This work attempted to determine the as yet unexplained phenomena of the maintenance of the depassivated state of the metal surface of aluminum pits in aqueous chloride solutions, and the mechanism of rate control of the subsequent corrosion reaction. Novel experimental techniques, including UV and NMR spectroscopy, were used to study the pit chemistry. Results obtained by chemical analysis provided new understanding of the chemical environment within the pits.","abstract_html":"This work attempted to determine the as yet unexplained phenomena of the maintenance of the depassivated state of the metal surface of aluminum pits in aqueous chloride solutions, and the mechanism of rate control of the subsequent corrosion reaction. Novel experimental techniques, including UV and NMR spectroscopy, were used to study the pit chemistry. Results obtained by chemical analysis provided new understanding of the chemical environment within the pits.","abstract_has_math":false,"creators":["Wong, Kai Pui"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Chemical Engineering","degree_department":null,"school":null,"contributors":["Alkire, Richard C."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2014,"date_issued":"2014-12-15T19:54:44Z","date_published":"2014-12-15T19:54:44Z","updated_at":"2026-07-22T22:26:01Z","subjects":["Engineering, Chemical"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI8823294"],"render_values":[{"text":"(UMI)AAI8823294","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/69794","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Alkire, Richard C."]},{"key":"dc:creator","label":"Author","values":["Wong, Kai Pui"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2014-12-15T19:54:44Z","10000-01-01","1988"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Chemical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Engineering, Chemical"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/69794","(UMI)AAI8823294"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["This work attempted to determine the as yet unexplained phenomena of the maintenance of the depassivated state of the metal surface of aluminum pits in aqueous chloride solutions, and the mechanism of rate control of the subsequent corrosion reaction. Novel experimental techniques, including UV and NMR spectroscopy, were used to study the pit chemistry. Results obtained by chemical analysis provided new understanding of the chemical environment within the pits.","A method was discovered for creating single corrosion pits on aluminum exposed to 1 M NaCl solutions at pH 11. Implantation of iron ions through a single 5 um mask opening was used to create a site, which, upon immersion in the electrolyte at $-0.5$ V SCE, corroded preferentially. Individual natural corrosion pits created by this method was round when viewed from above and, during early stages of growth, had shapes that corresponded to smooth spherical sections. Such morphological features are usually associated with anodic dissolution phenomena at surfaces covered with a film of precipitated dissolution products. By measuring the current emanating from single corrosion pits during growth and by determining the variation of pit surface area with time by a sequence of optical measurements, it was possible to obtain the time-dependent variation of current density during pit growth. It was found, for the system studied that the current density decreased with the square root of time and was in quantitative agreement with theoretical predictions. These results support the hypothesis that the corrosion rate was controlled by the rate of dissolution of an aluminum oxychloride film formed by precipitation of dissolution products.","Made available in DSpace on 2014-12-15T19:54:44Z (GMT). No. of bitstreams: 1 8823294.pdf: 4436391 bytes, checksum: 67e59aeb94b411be73d39534ea3f79e6 (MD5) Previous issue date: 1988","Embargo set by: Seth Robbins for item 69960 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","187 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1988."]},{"key":"dc:title","label":"Title","values":["Study of Single Corrosion Pits on Aluminum in Chloride Media"]}]}],"canonical_facts":{"dc:contributor":["Alkire, Richard C."],"dc:creator":["Wong, Kai Pui"],"dc:date":["2014-12-15T19:54:44Z","10000-01-01","1988"],"dc:description":["This work attempted to determine the as yet unexplained phenomena of the maintenance of the depassivated state of the metal surface of aluminum pits in aqueous chloride solutions, and the mechanism of rate control of the subsequent corrosion reaction. Novel experimental techniques, including UV and NMR spectroscopy, were used to study the pit chemistry. Results obtained by chemical analysis provided new understanding of the chemical environment within the pits.","A method was discovered for creating single corrosion pits on aluminum exposed to 1 M NaCl solutions at pH 11. Implantation of iron ions through a single 5 um mask opening was used to create a site, which, upon immersion in the electrolyte at $-0.5$ V SCE, corroded preferentially. Individual natural corrosion pits created by this method was round when viewed from above and, during early stages of growth, had shapes that corresponded to smooth spherical sections. Such morphological features are usually associated with anodic dissolution phenomena at surfaces covered with a film of precipitated dissolution products. By measuring the current emanating from single corrosion pits during growth and by determining the variation of pit surface area with time by a sequence of optical measurements, it was possible to obtain the time-dependent variation of current density during pit growth. It was found, for the system studied that the current density decreased with the square root of time and was in quantitative agreement with theoretical predictions. These results support the hypothesis that the corrosion rate was controlled by the rate of dissolution of an aluminum oxychloride film formed by precipitation of dissolution products.","Made available in DSpace on 2014-12-15T19:54:44Z (GMT). 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