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ELECTROCHEMICAL EVALUATION OF ADVANCED ANODIZED
ALUMINUM AND CHROMATE-FREE CONVERSION COATINGS
by
Yuelong Huang
A Dissertation Presented to the
FACULTY OF THE GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(MATERIALS SCIENCE)
December 2009
Copyright 2009 Yuelong Huang
Object Description
| Title | Electrochemical evaluation of advanced anodized aluminum and chromate-free conversion coatings |
| Author | Huang, Yuelong |
| Author email | yuelongh@usc.edu; yuelong_huang@hotmail.com |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Materials Science |
| School | Viterbi School of Engineering |
| Date defended/completed | 2009-10-09 |
| Date submitted | 2009 |
| Restricted until | Unrestricted |
| Date published | 2009-10-23 |
| Advisor (committee chair) | Mansfeld, Florian B. |
| Advisor (committee member) |
Goo, Edward Nealson, Kenneth |
| Abstract | In the present study, electrochemical evaluation of advanced surface modification methods for different metallic materials was performed using electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), cyclic polarization and other electrochemical techniques. This dissertation comprises four chapters. Chapter 1 is an overview of different corrosion protection technologies and electrochemical methods that can be used to characterize the corrosion behavior of different metals and alloys.; In chapter 2, the long-term (365 days) corrosion resistance of anodized Al 6061-T6 produced by two different hard anodizing (type III) processes was evaluated using EIS and SEM. The results suggest that these anodized samples were very corrosion resistant. Since the oxide layers of anodized Al 6061 are subject to thermal cycling in the semiconductor industry, the protective properties of the oxide layers that were subjected to thermal cycling treatments at 120, 160 and 200 degrees Centigrade were evaluated. The thermal cycling treatment can produce considerable damage of the outer porous oxide layer and the inner barrier layer.; The objective of the study in Chapter 3 was to determine the optimum process parameters for producing highly protective cerium-based conversion coatings on galvanized steels using an optimum treatment solution. The optimum combination of three factors was determined through 2 to the power 3 factorial design experiments.; Stainless steels provide good corrosion resistance through the formation of a chromium-rich oxide film on the metal surface. However, many types of stainless steels are susceptible to localized corrosion such as pitting corrosion and crevice corrosion. The objective of the study in Chapter 4 was to determine the corrosion resistance of three different stainless steels and a nickel-based alloy that were treated by an optimized treatment solution containing hydrogen peroxide, colloidal silica and silane. |
| Keyword | anodized aluminum; coatings; chromate-free conversion coatings |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m2687 |
| Rights | Huang, Yuelong |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | http://www.usc.edu/isd/libraries/services/ask_a_librarian/email/ |
| Filename | etd-Huang-3351 |
| Archival file | uscthesesreloadpub_Volume29/etd-Huang-3351.pdf |
Description
| Title | Page 1 |
| Full text | ELECTROCHEMICAL EVALUATION OF ADVANCED ANODIZED ALUMINUM AND CHROMATE-FREE CONVERSION COATINGS by Yuelong Huang A Dissertation Presented to the FACULTY OF THE GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (MATERIALS SCIENCE) December 2009 Copyright 2009 Yuelong Huang |
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