Local Environment in Pitting Corrosion of Aluminum

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.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Chemical Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Park, Jung Ock

Contributors dc:contributor

• Alkire, R.C.

• Engineering, Chemical

Language dc:language

eng

Identifier

(MiAaPQ)AAI9812735

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/82445