Pitting corrosion of aluminum-alloys at aluminum(3) iron inclusions: The effect of local chemical environment and transport phenomena
Paik, Chi-Hum
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https://hdl.handle.net/2142/19040
Description
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
Issue Date
1993
Doctoral Committee Chair(s)
Alkire, Richard C.
Department of Study
Chemical and Biomolecular Engineering
Discipline
Chemical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Chemical Engineering
Language
eng
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.
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