{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/22233"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/22233","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Laser initiated corrosion pits on aluminum","abstract":"Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:56:14Z Item is restricted indefinitely.","abstract_html":"Item marked as restricted to the &#x27;UIUC Users [automated]&#x27; Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:56:14Z Item is restricted indefinitely.","abstract_has_math":false,"creators":["Buzza, David Wayne"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Chemical and Biomolecular Engineering","degree_department":null,"school":null,"contributors":["Alkire, Richard C."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T13:33:20Z","date_published":"2011-05-07T13:33:20Z","updated_at":"2026-07-22T22:25:19Z","subjects":["Engineering, Chemical"],"languages":["eng"],"rights":["Copyright 1992 Buzza, David Wayne"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9305476","(UMI)AAI9305476"],"render_values":[{"text":"AAI9305476","href":null,"code":true},{"text":"(UMI)AAI9305476","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/22233","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":["Buzza, David Wayne"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T13:33:20Z","10000-01-01","1992"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Chemical and Biomolecular 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":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1992 Buzza, David Wayne"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9305476","(UMI)AAI9305476","http://hdl.handle.net/2142/22233"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:56:14Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:26:16-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","A laser initiation technique was developed that could control both the time and the location of pit initiation on a pure aluminum electrode that was immersed in 1.0 M NaCl, pH 11 solution and held under an applied potential. A new technique which was based on the laser initiation technique was invented to initiate an ordered array of pits of up to 61 pits that were spaced 100 $\\mu$m apart.","A study of the shape of single pits by a 3-D post electrolysis SEM method revealed detailed characteristics of pitting corrosion, such as: pit repassivation and secondary pit nucleation within a primary pit. The study also showed that single corrosion pits tended to be round and polished during the early stages of growth ($<$90 s) for applied potentials of $-$0.7 to $-$0.52 V, SCE, which suggested that a precipitated electropolishing film was present on the pit surface. It was also found that the measured dependency of the current density and the radius of a single pit with time, agreed, for over 3 orders of magnitude of time, with a theoretical model which was based on the pit growth rate being limited by the diffusion controlled dissolution rate of a precipitated aluminum oxychloride film. Other experimental results were found to be inconsistent for a pit growth rate that was limited by the potential drop in solution. Therefore, for these conditions, it was concluded that the pit growth rate was limited by the diffusion controlled dissolution rate of a precipitated aluminum oxychloride film, despite the presence of a vigorous gas evolution reaction.","Additional experimental results suggested that a condition for pit repassivation was the disappearance of the precipitated salt film. Once the salt film had disappeared, the pit stability was found to depend on both the (Cl$\\sp-$) in the solution adjacent to the pit surface and the applied potential. The pit stability criteria was found to be independent of the pit size. However, larger pits were found to be more stable than smaller pits owing to the increased transport resistance for a larger pit. In conclusion, for this system, transport processes were found to be important in determining the pit growth rate and the pit stability.","Made available in DSpace on 2011-05-07T13:33:20Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9305476.pdf: 4232598 bytes, checksum: 7ec38b8191940edf55500b29f7cbbef9 (MD5) Previous issue date: 1992","U of I Only"]},{"key":"dc:title","label":"Title","values":["Laser initiated corrosion pits on aluminum"]}]}],"canonical_facts":{"dc:contributor":["Alkire, Richard C."],"dc:creator":["Buzza, David Wayne"],"dc:date":["2011-05-07T13:33:20Z","10000-01-01","1992"],"dc:description":["Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:56:14Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:26:16-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","A laser initiation technique was developed that could control both the time and the location of pit initiation on a pure aluminum electrode that was immersed in 1.0 M NaCl, pH 11 solution and held under an applied potential. A new technique which was based on the laser initiation technique was invented to initiate an ordered array of pits of up to 61 pits that were spaced 100 $\\mu$m apart.","A study of the shape of single pits by a 3-D post electrolysis SEM method revealed detailed characteristics of pitting corrosion, such as: pit repassivation and secondary pit nucleation within a primary pit. The study also showed that single corrosion pits tended to be round and polished during the early stages of growth ($<$90 s) for applied potentials of $-$0.7 to $-$0.52 V, SCE, which suggested that a precipitated electropolishing film was present on the pit surface. It was also found that the measured dependency of the current density and the radius of a single pit with time, agreed, for over 3 orders of magnitude of time, with a theoretical model which was based on the pit growth rate being limited by the diffusion controlled dissolution rate of a precipitated aluminum oxychloride film. Other experimental results were found to be inconsistent for a pit growth rate that was limited by the potential drop in solution. Therefore, for these conditions, it was concluded that the pit growth rate was limited by the diffusion controlled dissolution rate of a precipitated aluminum oxychloride film, despite the presence of a vigorous gas evolution reaction.","Additional experimental results suggested that a condition for pit repassivation was the disappearance of the precipitated salt film. Once the salt film had disappeared, the pit stability was found to depend on both the (Cl$\\sp-$) in the solution adjacent to the pit surface and the applied potential. The pit stability criteria was found to be independent of the pit size. However, larger pits were found to be more stable than smaller pits owing to the increased transport resistance for a larger pit. In conclusion, for this system, transport processes were found to be important in determining the pit growth rate and the pit stability.","Made available in DSpace on 2011-05-07T13:33:20Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9305476.pdf: 4232598 bytes, checksum: 7ec38b8191940edf55500b29f7cbbef9 (MD5) Previous issue date: 1992","U of I Only"],"dc:identifier":["AAI9305476","(UMI)AAI9305476","http://hdl.handle.net/2142/22233"],"dc:language":["eng"],"dc:rights":["Copyright 1992 Buzza, David Wayne"],"dc:subject":["Engineering, Chemical"],"dc:title":["Laser initiated corrosion pits on aluminum"],"dc:type":["text"],"thesis:degree_discipline":["Chemical and Biomolecular Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:19Z"}