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US 5,401,333 AGranted
Method of monitoring dried-in-place non-chrome polyacrylamide based treatments for aluminum
AssigneeBetz Laboratories, Inc.
InventorsJiangbo Ouyang, William L. Harpel
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Abstract
A process for measuring the coating weight of a dried-in-place non-chromate polyacrylamide/surfactant based conversion coating is disclosed. An ammonium hexafluorotitanate tracer added to such a conversion coating was found to not adversely affect coating properties. The tracer was found to remain proportional to the polymer matrix when the coating was analyzed by X-ray fluorescence.
Claims1
A process for monitoring the coating weight of an anionic polyacrylamide/surfactant based aluminum treatment comprising:
- a. adding ammonium hexafluorotitanate in concentrations ranging from about 0.1 to 10% by weight of a treatment solution to an anionic polyacrylamide/surfactant based treatment solution;
- b. treating an aluminum surface with said combination;
- c. subjecting the treated surface to X-Ray fluorescence to detect titanate in the coating wherein titanate detected by X-Ray fluorescence is proportional to the coating weight.
Dependencies are inferred from the claim text.