Composition and method for inhibiting corrosion of an anodized material
A method for inhibiting corrosion of an anodized material including applying to the anodized material a corrosion inhibiting composition that includes a liquid carrier and an electrically conductive nanomaterial dispersed in the liquid carrier.
1. A method for inhibiting corrosion of an anodized material, said anodized material comprising a substrate having an oxide layer, said oxide layer comprising pores and defining an external surface, said method comprising:
applying directly to said oxide layer a corrosion inhibiting composition comprising:
a liquid carrier; and
an electrically conductive carbon nanomaterial dispersed in said liquid carrier, wherein said electrically conductive carbon nanomaterial comprises at least one of nanoplatelets, nanotubes and nanorods, and wherein said applying step results in presence of said electrically conductive carbon nanomaterial in said pores; and
removing said corrosion inhibiting composition from said external surface without removing said corrosion inhibiting composition from said pores,
wherein, after said removing step, corrosion of said anodized material is inhibited to an extent sufficient to pass two weeks of neutral salt spray exposure in accordance with ASTM B117.
2. The method of claim 1 wherein said substrate comprises aluminum.
3. The method of claim 2 wherein said oxide layer comprises aluminum oxide.
4. The method of claim 1 wherein said applying step comprises brushing said corrosion inhibiting composition onto said oxide layer.
5. The method of claim 1 wherein said removing step comprises at least one of wiping and washing.
6. The method of claim 1 wherein said removing step is performed after expiration of a dwell time of at least 30 minutes.
7. The method of claim 6 wherein said dwell time is at least 60 minutes.
8. The method of claim 1 wherein said applying step comprises immersing said anodized material in said corrosion inhibiting composition.
9. The method of claim 1 further comprising drying said corrosion inhibiting composition.
10. The method of claim 1 further comprising heating said corrosion inhibiting composition to a temperature of between 190° F. and 200° F. prior to said applying step.
11. The method of claim 1 wherein said corrosion inhibiting composition is constantly agitated during said applying step.
12. The method of claim 1 wherein said liquid carrier comprises ethoxylated alcohol.
13. The method of claim 1 wherein said liquid carrier has a surface tension of at most 35 dynes/cm.
14. The method of claim 1 wherein said liquid carrier has a surface tension of at most 25 dynes/cm.
15. The method of claim 1 wherein said electrically conductive carbon nanomaterial comprises graphene nanoplatelets.
16. The method of claim 15 wherein said graphene nanoplatelets have a thickness between 2 nanometers and 10 nanometers.
17. The method of claim 1 wherein said liquid carrier comprises deionized water.
18. The method of claim 1 wherein said liquid carrier comprises penetrant solution, and wherein a weight ratio of said liquid carrier to said electrically conductive carbon nanomaterial ranges from about 120:1 to about 30:1.
19. The method of claim 1 wherein said electrically conductive carbon nanomaterial is dispersed in said liquid carrier at a concentration ranging from 1 to 10 grams of said electrically conductive carbon nanomaterial per liter of said liquid carrier.
20. The method of claim 1 wherein said electrically conductive carbon nanomaterial is dispersed in said liquid carrier at a concentration ranging from 2 to 5 grams of said electrically conductive carbon nanomaterial per liter of said liquid carrier.