Electrolytic and spontaneous spray deposition of organic assisted cerium conversion coatings for the corrosion protection of aluminum alloys
"The primary goal of this study is to make, characterize and evaluate cerium conversion coatings on aluminum alloys prepared with the assistance of gelatin and certain amino acids. These coatings are potential replacements for chromate conversion coatings which, are very effective. Unfortunately, chromium is targeted for elimination from the workplace because it is very toxic. The important factors in the development of the cerium conversion coating process are cleaning temperature, current density, potential, pH, cerium concentration, additive concentration, coating time, and post deposition treatments. Both electrolytic and spray applied processes have been developed using gelatin and/or amino acids to assist the deposition of the cerium conversion coating on aluminum alloy 7075 T-6 that gave greater than 80% pass rate for the ASTM B-117 salt fog corrosion test. The process included an alkaline cleaning step, application of an acidified containing cerium containing gelatins and/or amino acids solution by either an electrolytic or spray deposition, followed by sealing in a boiling aqueous sodium phosphate solution. These organic additive assisted cerium conversion coatings offer better corrosion protection, thicker coatings, more polarization, and better uniformity that those deposited from an aqueous electrolyte without organic additive"--Abstract, leaf iv.
Ph. D. in Chemistry
University of Missouri--Rolla
Journal article titles appearing in thesis/dissertation
- Electrodeposition of gelatin assisted cerium conversion coating
- Comparative study of the effects of gelatins on electrodeposition of cerium conversion coating
- Corrosion protection of electrodeposition cerium conversion coatings aluminum alloy 7075 T-6 utilizing amino acids as organic additives coatings
- Development of gelatin and amino acid assisted spontaneous spray cerium conversion coatings
xiv, 175 leaves
© 2005 Alexander Albert William , Jr., All rights reserved.
Dissertation - Citation
Library of Congress Subject Headings
Coating processes -- Technological innovations
Aluminum alloys -- Corrosion
Corrosion and anti-corrosives
Print OCLC #
Link to Catalog Record
Full-text not available: Request this publication directly from Missouri S&T Library or contact your local library.http://laurel.lso.missouri.edu/record=b5707749~S5
Williams, Alexander Albert, "Electrolytic and spontaneous spray deposition of organic assisted cerium conversion coatings for the corrosion protection of aluminum alloys" (2005). Doctoral Dissertations. 1640.