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US 2017/0241022 A1Published application
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.
Claims20
A chromium-containing conversion coating processing line consisting of:
- a deoxidizing bath comprising a deoxidizing solution;
- and
- a chromium-containing conversion coating bath comprising a chromium-containing conversion coating solution;
- wherein the processing line does not comprise an intervening rinse between the deoxidizing bath and the chromium-containing conversion coating bath;
- and
- wherein the chromium-containing conversion coating bath comprises an amount of deoxidizing solution in an amount from about 4% to about 50% by volume.
3 more elements
A chromium-containing conversion coating applied to a substrate according to a 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;
- and
- eliminating production of chromium contaminated rinse water in the chromium-containing conversion coating process;
- wherein the substrate is withdrawn from the deoxidizing solution without a rinse step.
3 more elements
A chromium-containing conversion coating applied to a substrate according to a 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 dead rinse;
- removing the substrate from the dead rinse;
- immersing the substrate into a chromium-containing conversion coating solution;
- and
- eliminating production of flowing chromium contaminated waste water in the chromium-containing conversion coating process
- wherein the substrate is withdrawn from the deoxidizing solution without a rinse step.
5 more elements
Dependencies are inferred from the claim text.