Patent ID: 11925988
Assignee: GENERAL ELECTRIC COMPANY
Field: Materials, metallurgy (Chemistry)
Classification: CPC B  C | IPC B

Claim 0:
1. A method of reducing a concentration of hexavalent chromium within a first aluminum slurry containing a first aluminum powder, a phosphoric acid, a hexavalent chromium compound, and water, the method comprising:
adding a reducing agent to the first aluminum slurry to form a second aluminum slurry, wherein the reducing agent causes a chemical reduction reaction with the hexavalent chromium compound to form a trivalent chromium compound within the second aluminum slurry such that a first weight ratio of hexavalent chromium to trivalent chromium in the first aluminum slurry is decreased to a second weight ratio of hexavalent chromium to trivalent chromium in the second aluminum slurry, with the second weight ratio being less than the first weight ratio, wherein the first aluminum slurry, prior to the addition of the reducing agent, comprises: the first aluminum powder, the phosphoric acid, 1% by weight to 5% by weight hexavalent chromium, 0.1% by weight to 1% by weight trivalent chromium, and water.