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US 10,472,720 B2Granted
Reduction of chromium waste in an aluminum conversion coat processing line
AssigneeThe Boeing Company
InventorLawrence M. Lawless
Life of this patent
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Abstract
The present disclosure relates generally to the field of conversion coating. More specifically, the present disclosure relates to improved methods for improving efficiency of chromium conversion coat processing lines.
Claims15
A chromium-containing conversion coating applied to a substrate according to a method, the method comprising:
- immersing a substrate into a chromium-containing deoxidizing solution to deoxidize the substrate surface;
- removing the substrate from the deoxidizing solution;
- immersing the substrate into a chromium-containing conversion coating solution;
- eliminating production of chromium contaminated rinse water in the chromium-containing conversion coating process;
- and
- wherein, without an intervening rinse step, the substrate is withdrawn from the deoxidizing solution and the substrate is immersed into the chromium-containing conversion coating solution.
3 more elements
Dependencies are inferred from the claim text.