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US 6,206,981 B1Granted
Process for enhancing the adhesion of organic coatings to metal surfaces
AssigneeMacDermid, Incorporated
InventorMelvin R. Jenkins
Life of this patent
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Abstract
A process is described for increasing the adhesion of organic coatings to metal surfaces, particularly aluminum and aluminum alloys. The process involves the utilization of an adhesion promoting composition in conjunction with a chromating composition in treating the metal surface prior to application of the organic coating. The adhesion promoting composition comprises (i) 1,2-bis(beta-chloroethoxy)ethane, (ii) a glycol ether, (iii) an oxidizing acid and (iv) a nitro sulfonic acid.
Claims5
A process for improving the adhesion of an organic coating to a metal surface, said process comprising:
- a. contacting the metal surface with an adhesion promoting composition comprising:
- 1. a glycol ether;
- 2. an oxidizing acid;
- 3. a nitro sulfonic acid;
- and
- 4. optionally, 1,2 bis(beta-chloroethoxy)ethane;
- b. subsequently contacting the metal surface with a chromating composition;
- and
- c. subsequently applying an organic coating to the metal surface.
6 more elements
Dependencies are inferred from the claim text.