Journal
ANALYTICAL CHEMISTRY
Volume 83, Issue 16, Pages 6127-6131Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac2012416
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- United Technologies Research Center (UTRC)
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Combined in situ spectroscopic ellipsometry and electrochemistry have been employed to monitor, in real-time, the formation of trivalent Cr conversion coatings on polished Al substrates at applied sample potentials. It is found that the formation kinetics and chemical composition of the film can be controlled by adjusting the anodic and cathodic reactions. The growth kinetics are accelerated at more positive anodic potentials or more negative cathodic potentials. At more negative potentials, the percentage of chromium in the coating is found to increase, while the zirconium percentage decreases.
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