Hexavalent Chromium (Cr{sup}(+6)) Reduction at U.S. Air Force Plant 44 in Tucson, Arizona

摘要

As part of the U.S. Air Force Plant (AFP) 44 Pollution Prevention (P2) Program at Raytheon Missile Systems in Tucson, Arizona, a project was commissioned to reduce the use of hexavalent chromium (Cr{sup}(+6)) in missile manufacturing and depot level repair operations. The main sources of Cr{sup}(+6) were from the conversion coating of aluminum alloys per MIL-DTL-5541. The secondary source was from Cr{sup}(+6) containing paint primers per MIL-PRF-85582 (waterborne) and MIL-PRF-23377 (high solids) that are utilized in solvent based painting of components per MIL-PRF-85285. This paper summarizes the Cr{sup}(+6) alternatives that were identified and how they performed in qualification testing.