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Chemical Conversion Coatings
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English
Abstract
Chemical conversion coatings represent those coatings formed by contacting a metallic substrate with a “chemical” solution that “converts” or “changes” the metallic surface from its original composition. The “conversion” process may arise via chemical or electrochemical interaction at the metallic surface, and produces a “coating” that is an integral part of the metal substrate. The presence of this “conversion coating” provides an increase in the corrosion resistance of the metal substrate, both with and without a subsequently applied organic film, and an increase in the adhesive capability of the metal substrate toward further organic film applications. Typical conversion coatings that are widely used in industry are phosphates (zinc, iron, manganese, calcium-zinc), chromates, chrome-free coatings, oxides (chemically or electrochemically formed); where each coating type provides the necessary properties that meet a particular requirement of industry
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Citation
Davis, J., "Chemical Conversion Coatings," SAE Technical Paper 831834, 1983, https://doi.org/10.4271/831834.Also In
References
- Metals Handbook Ninth Edition 5
- Das, N. U.S. Patent 3,964,936 June 22 1976
- Kelly, T.L. U.S. Patent 4,273,592 June 16 1976
- Frelin F.J. Kelly T.L. Malloy A.J. U.S. Patent 4,313,769 February 2 1982
- Frelin F.J. Kelly T.L. Malloy A.J. U.S. Patent 4,370,177 January 25 1983
- Kelly T.L. U.S. Patent 4,148,670 April 10 1979