Abstract
Abstract : Pretreatments based on zirconium oxide are being used commercially in automotive and other industrial operations as replacements to hexavalent chromium-based and zinc phosphate pretreatments. This report describes work to document the performance of commercial zirconium oxide pretreatments when used with existing military primers and, where necessary, to modify them to meet military specifications for performance. The evaluation of zirconium immersion pretreatments intended for OEM application over CRS and aluminum with water-borne and solvent-borne Mil-Spec primers gave results in corrosion performance similar to the chrome (VI) and zinc phosphate pretreatment controls. In conjunction with ARL, modified versions of the commercial zirconium pretreatment were developed that showed corrosion resistance equal to or better than zinc phosphate in both spray-applied and immersion-applied processes. Therefore, the work showed that the current commercial zirconium pretreatment technology with some modifications is suited for use in DoD OEM processes. Visits to Marine Corps Logistics Base Albany, Albany GA, and Letterkenny Army Depot, Chambersburg PA, suggested that development of an immersion zirconium pretreatment process would be of utility for DoD repair depots as well. However, many painting operations that are used by depots or in field repair settings, which could benefit from the use of zirconium pretreatment technology, require spray application, with or without a subsequent rinse. Versions of zirconium pretreatments based on the currently commercial systems were tested as a Spray-On/Rinse-Off treatment or as a Dried-In-Place (DIP) treatment. By adding a rheology modifier to a spray version of the OEM product to hold the pretreatment on the intended part during reaction, a Spray-On/Rinse-Off product was developed which demonstrated good corrosion and adhesion performance under CARC primers.
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