Back to results
US 10,557,210 B2Granted
Direct electrochemical synthesis of doped conductive polymers on metal alloys
AssigneeThe Boeing Company
InventorsPatrick John Kinlen, Lawrence Michael Lawless
Life of this patent
Estimating the term…
Abstract
This disclosure relates generally to the discovery of improved methods of reducing corrosion on metals and metal alloys without using hexavalent chromium reagents. More particularly, the disclosure relates to preparing corrosion resistant metals using doped conducting polymers such as polyaniline (PANI) on metal alloys such as aluminum alloys.
Claims20
A method for preparing a corrosion-resistant anodized metal surface, the method comprising:
- anodizing a metal surface with a bath liquid comprising water, sulfuric acid, and an aniline-monomer to form a corrosion-resistant coating of a doped polyaniline (PANI) on the metal surface;
- de-doping the doped PANT of the anodized metal surface by rinsing the anodized metal surface with deionized (DI) water such that the corrosion-resistant coating of the doped PANI becomes de-doped and non-conducting;
- and
- re-doping the de-doped PANI of the rinsed anodized metal surface by sealing the rinsed anodized metal surface with a seal solution consisting essentially of water and a dimercaptothiadiazole inhibitor at a temperature of about 80° C. to about 100° C. so as to form a re-doped conductive corrosion-resistant PANI coating on the rinsed anodized metal surface, wherein the dimercaptothiadiazole inhibitor is used as a dopant to form the re-doped conductive corrosion-resistant PANI coating.
1 more element
A method for making a doped polyaniline on a metal surface comprising:
- electrochemically depositing an aniline-monomer on a metal surface to form a corrosion-resistant coating of a doped polyaniline (PANI) on the metal surface using a bath liquid comprising water, sulfuric acid, and the aniline-monomer;
- de-doping the doped PANI by rinsing the coated metal surface with deionized (DI) water such that the corrosion-resistant coating of the doped PANI becomes de-doped and non-conducting;
- and
- re-doping the rinsed metal surface by exposing the de-doped PANI on the rinsed metal surface to a dimercaptothiadiazole inhibitor so as to form a re-doped conductive corrosion-resistant PANI coating on the rinsed metal surface by sealing the rinsed metal surface with a seal solution consisting essentially of water and the dimercaptothiadiazole inhibitor at a temperature of about 80° C. to about 100° C., wherein the dimercaptothiadiazole inhibitor is used as a dopant to form the re-doped conductive corrosion-resistant PANI coating.
1 more element
Dependencies are inferred from the claim text.