Accession Number : ADA430659

Title :   Examination of Alternative Pretreatments to Hexavalent Chromium Based DOD-P-15328D Wash Primer for MIL-A-46100D High Hard Steel Armor

Descriptive Note : Final rept. Jul 2002-Sep 2003

Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Placzankis, Brian E. ; Miller, Chris E. ; Kelley, John V.

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Report Date : JAN 2005

Pagination or Media Count : 52

Abstract : Hexavalent Chromium based compounds with their associated health and environmental risks have necessitated reductions and even eliminations of their usage in U.S. Army weapon systems. These compounds are primarily associated with pretreatments and conversion coatings applied prior to primers and topcoats that make up the Chemical Agent Resistant Coating (CARC) coating system. Despite these hazards, for armor steels such as MIL-A-46100D high hard alloy, hexavalent chromium based DOD-P-15328D wash primer is still commonly used. This study explores the effectiveness of wash primer alternatives with respect to corrosion, adhesion, and susceptibility to Environmentally Assisted Cracking (EAC) issues. The alternatives studied were: spray based zinc phosphate in accordance with TT-C-490, grit blast only with no other pretreatment, and grit blast with a rust inhibiting sealer.

Descriptors :   *METAL COATINGS, *PRIMERS, *CHROMIUM, ENVIRONMENTS, CORROSION, CRACKS, STEEL, CHEMICAL AGENTS, PHOSPHATES, CHROMIUM COMPOUNDS.

Subject Categories : COATINGS, COLORANTS AND FINISHES
      AMMUNITION AND EXPLOSIVES

Distribution Statement : APPROVED FOR PUBLIC RELEASE

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