Alkaline oxide conversion coatings for aluminum alloys Page: 1 of 14
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ALKALINE OXIDE CONVERSION COATINGS FOR ALUMINUM ALLOYS*
Sandia National Laboratories
Albuquerque, New Mexico 87185
Three related conversion coating methods are described that are based on film formation which
occurs when aluminum alloys are exposed to alkaline Li salt solutions. Representative examples of the
processing methods, resulting coating structure, composition and morphology are presented. The
corrosion resistance of these coatings to aerated 0.5 M NaCl solution has been evaluated as a function of
total processing time using electrochemical impedance spectroscopy (EIS). This evaluation shows that
excellent corrosion resistance can be uniformly achieved using no more than 20 minutes of process time
for 6061-T6. Using current methods a minimum of 80 minutes of process time is required to get
marginally acceptable corrosion resistance for 2024-T3. Longer processing times are required to achieve
uniformly good corrosion resistance.
Keywords: hydrotalcite, conversion coating, corrosion resistance, aluminum alloys, electrochemical
*This work was performed at Sandia National Laboratories under contract DE-AC04-94AL85000.
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Buchheit, R.G. Alkaline oxide conversion coatings for aluminum alloys, article, February 1, 1996; Albuquerque, New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc664546/m1/1/: accessed March 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.