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Title:Pitting corrosion of aluminum-alloys at aluminum(3) iron inclusions: The effect of local chemical environment and transport phenomena
Author(s):Paik, Chi-Hum
Doctoral Committee Chair(s):Alkire, Richard C.
Department / Program:Chemical and Biomolecular Engineering
Discipline:Chemical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Chemical Engineering
Abstract:Al$\sb3$Fe and $\alpha$-AlFeSi type intermetallic particles depassivate the passive film of many commercial aluminum alloys through a local alkalization mechanism in an aerated NaCl solution. This mechanism was verified on the basis of polarization data, theoretical modeling, and in-situ optical observations for commercial aluminum alloys 6061-T6, 5454-H32, and Al-8%Fe. The local alkalization results in either ditching or pitting at the interfacial region between the particles and the aluminum matrix. A micro-disk electrode concept was adopted to calculate the oxygen reduction limiting current at intermetallics to explain the mechanism and predict the related electrochemical behavior. It is suggested that dissolved oxygen acts as a depassivator for the pitting on commercial aluminum alloys in an aerated NaCl solution.
Issue Date:1993
Rights Information:Copyright 1993 Paik, Chi-Hum
Date Available in IDEALS:2011-05-07
Identifier in Online Catalog:AAI9329127
OCLC Identifier:(UMI)AAI9329127

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