Accession Number:

AD1111076

Title:

Demonstration of Chrome-Free Pretreatments at Corpus Christi Army Depot

Descriptive Note:

[Technical Report, Technical Report]

Corporate Author:

Combat Capabilities Development Command Army Research Laboratory

Report Date:

2020-09-01

Pagination or Media Count:

46

Abstract:

Recent changes in regulations are driving the need for chrome-free coating and treatments on DOD assets. Recent work in the laboratory has identified aluminum surface treatments that can replace legacy chrome conversion coatings in spray and immersion processes at military repair depots. These treatments needed to be applied and validated in a depot setting to establish viability as an alternative to legacy treatments. Two demonstrations, using three different chrome-free surface treatments and the legacy system, were completed at Corpus Christi Army Depot encompassing spray and immersion processes for applying conversion coatings on aluminum substrates. The parts and panels received the aviation stackup of primer and topcoat after the surface treatments were applied. The parts and panels were tested in various ways including laboratory and static outdoor exposures. The successful demonstrations showed that non-chrome aluminum surface treatments can be used as part of depot processes and perform on the same level expected from legacy hexavalent chrome-containing conversion coatings.

Descriptors:

Subject Categories:

  • Coatings, Colorants and Finishes

Distribution Statement:

[A, Approved For Public Release]