Local Environment in Pitting Corrosion of Aluminum
Park, Jung Ock
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https://hdl.handle.net/2142/82445
Description
Title
Local Environment in Pitting Corrosion of Aluminum
Author(s)
Park, Jung Ock
Issue Date
1997
Doctoral Committee Chair(s)
Alkire, R.C.
Department of Study
Chemical Engineering
Discipline
Chemical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Chemical
Language
eng
Abstract
The pH and chloride microsensors were used to study propagation and repassivation of pits on pure aluminum in pH 11 NaCl solution. It was concluded that the pH inside a growing pit was around 2.7, and the chloride concentration was higher than the saturation concentration. After current to the pit was turned off, pH of the pit electrolyte stayed at 4.5 for 30 s before relaxing to pH 11. It was proposed that dissolution of salt film inside pits buffered pH of the pit electrolyte when the pit growth was terminated, and the dissolution of the salt film determined the pit repassivation behavior.
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