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US 9,683,293 B2Granted
Reduction of chromium waste water 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.
Claims19
A method for reducing the amount of rinse water produced in a chromium-containing conversion coating process comprising the steps of:
- preparing a substrate having a substrate surface for immersion into a deoxidizing solution;
- immersing the 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- wherein the substrate is withdrawn from the deoxidizing solution without a rinse step.
4 more elements
A method for reducing the amount of flowing rinse water produced in a chromium-containing conversion coating process comprising the steps of:
- preparing a substrate having a substrate surface for immersion into a deoxidizing solution;
- immersing the 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- wherein the substrate is withdrawn from the deoxidizing solution without a rinse step.
6 more elements
Dependencies are inferred from the claim text.