Summary
The trivalent chro
miu
m pretreat
ment for
mulated and invented by NAVAIR perfor
ms very well for replacing hexavalent chro
miu
m on alu
minu
m. Its perfor
mance varies depending on the type of detergent and its concentration, te
mperature, and cycle ti
me. Also i
mportant is the surface activation and the type of acid and/or deoxidizer that is used for the application. However, the
most i
mportant factor is the type of alu
minu
m alloy undergoing Chro
mate conversion coating. It was concluded fro
m the study that 2024 is the
most difficult alloy due to its
metallurgical content; if satisfactory results can be obtained for 2024, then it would not be so difficult to achieve successful results for other alu
minu
m alloys.
The EPA, when added to a standard trivalent chromium pretreatment (NAVAIR) bath, exhibited outstanding performance in NSS-testing. This additive is designed to enhance corrosion resistance of an aluminum alloy for trivalent chromium pretreatment performance. An EPA offers consistent corrosion resistance performance for difficult alloys, such as 2024. It is an additive that improves standard NAVAIR trivalent chromium application on aluminum for robust performance.
It is sufficient to say that the most important aspect of using this newly developed, patented additive for trivalent chromium pretreatment its effective and consistent corrosionresistance performance.