Self-healing paint could halt rust on military vehicles
Anew additive could help military vehicles, including the Marine Corps variant of the joint light tactical vehicle ( JLTV), heal like human skin and avoid costly maintenance as a result of corrosion, officials announced on March 18. Developed by the Johns Hopkins University Applied Physics Laboratory in partnership with the Office of Naval Research (ONR), polyfibroblast allows scratches forming in vehicle paint to scar and heal before the effects of corrosion ever reach the metal beneath.
Polyfibroblast is a powder that can be added to commercial-off-the-shelf paint primers. It is made up of microscopic polymer spheres filled with an oily liquid. When scratched, resin from the broken capsules forms a waxy, water-repellant coating across the exposed steel that protects against corrosion.
While many self-healing paints are designed solely for cosmetic purposes, polyfibroblast is being engineered specifically for tactical vehicles used in a variety of harsh environments.
From rainstorms to sunlight, tactical vehicles face constant corrosion threats from the elements. Corrosion costs the Department of Navy about $7 billion each year. About $500 million of that is the result of corrosion to Marine Corps ground vehicles, according to the most recent Department of Defense reports.
Vehicles transported and stored on ships also are subject to salt spray from the ocean, a leading cause of problems for military hardware. In one laboratory experiment, polyfibroblast showed it could prevent rusting for six weeks inside a chamber filled with salt fog.
“We are still looking into how to make this additive even more effective, but initial results like that are encouraging,” said Scott Rideout, Deputy Program Manager, Light Tactical Vehicles, Program Executive Officer Land Systems, which is overseeing continued development on polyfibroblast for potential use on the Marine Corps variant of the JLTV. “Carry that out of the lab and into the inventory, and that translates to improved readiness and big savings.”