Non-Chromate, ZVOC Coatings for Steel Substrates on Army and Navy Aircraft and Ground Vehicles
Cost and performance rept.
ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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The objective of this demonstration is to determine the viability of non-chromate pretreatments for High Hard Armor HHA steel in order to improve the long term corrosion resistance of the low-volatile organic compound VOC chemical agent resistant coating CARC system to reduce lifecycle costs for these weapon systems. Stryker and Mine Resistant Ambush Protected Armored Vehicle MRAP contracts are prohibited from using hex-chrome and have been coated without any corrosion inhibitive pretreatment or conversion coating. The products demonstrated satisfy the hexavalent chrome prohibition for both vehicles while minimizing environmental impact. These technologies are spray-applied pretreatments meant to be used on properly prepared steel substrates. These technologies include trivalent chromium SurTec 650 and two non-chromium pretreatments Chemetall Oxsilan 98102, and Pittsburgh Plate Glass Industries PPG Zircobond 4200. Trivalent chrome pretreatments have been used successfully on aluminum substrates for many years. Oxsilan 98102 is a phosphorus free liquid, silane-based product that is intended to enhance the performance of organic coatings. As the film dries, neighboring hydroxyl groups react with each other to form a dense, interpenetrating, crosslinked network that is chemically bound to the metal surface. Zircobond 4200 is a zirconate based pretreatment developed as a replacement for zinc phosphate. All of these pretreatments are commercially available.
- Coatings, Colorants and Finishes
- Properties of Metals and Alloys