Abstract
In this study, an electroactive polymer (EAP), poly(2,5-bis(N-methyl-N- hexylamino)phenylene vinylene) (BAM-PPV), was tested as an alternative to current hexavalent chromium (Cr(VI))-based Army wash primers. BAM-PPV was tested in both laboratory and field studies to determine its adhesive and corrosion-inhibiting properties when applied to steel and aluminum alloys. The Army Research Laboratory (ARL) tests showed that BAM-PPV combined with an epoxy primer and the Army chemical agent-resistant coating (CARC) topcoat met Army performance requirements for military coatings. After successful laboratory testing, the BAM-PPV was then field tested for one year at the Aberdeen Test Center (ATC). This field testing showed that BAM-PPV incorporated into the Army military coating survived with no delamination of the coating and only minor corrosion on the chip sites.
Highlights
The Army wash primer (DOD-P-15328D) that is currently used on Army military vehicles was developed during World War II
Neutral Salt Spray (NSS) exposure testing was performed on grit-blasted steel surfaces to mimic Army depot de-painting and cleaning operations prior to re-application of Army military coatings
BAM-PPV pretreatment followed by MIL-DTL-53022 epoxy primer and topcoated with chemical agent resistant coating (CARC) topcoat (MIL-DTL-53039 or MIL-DTL-64159) did not complete the 2016 h NSS exposure testing before extensive corrosion and delamination was evident in the scribed areas
Summary
The Army wash primer (DOD-P-15328D) that is currently used on Army military vehicles was developed during World War II. There are several reports of EAPs used as replacements for the Cr(VI)-based wash primer [22,23] These studies focused on laboratory testing of the EAP via electrochemical and ASTM methods, which provided evidence for corrosion protection of the underlying metal. BAM-PPV was field tested as a CCC replacement by researchers at the NAWCWD in cooperation with Wright-Patterson Air Force Base (WPAFB) (Figure 3) This EAP was coated on the rear cargo hatch door of the C-5 Galaxy aircraft. Cr(VI) aerospace coating (CCC, Cr(VI) epoxy primer and polyurethane topcoat) and had similar corrosion and adhesion performance during Air Force field testing [25]. Based on the successful results from the field tests performed by WPAFB, this study was undertaken to investigate BAM-PPV as a potential alternative to the Cr(VI)-based Army wash primer. Cr(VI)-based Army wash primer alternative and is non-toxic, it was field tested
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