Low-Cost, Long-Lasting Liquid Coating (KSC-12049)

Abstract:
NASA's highly reliable, low-cost liquid-applied coating offers companies the ability to conveniently protect embedded steel rebar surfaces from corrosion. The inorganic, galvanic coating contains one or more of the following metallic particles: magnesium, zinc, or indium. In addition, the coating may contain moisture-attracting compounds that facilitate the protection process. After the coating is applied to the outer surface of reinforced concrete, an electrical current is established between the metallic particles and the surfaces of the embedded steel rebar. This electrical (ionic) current is responsible for providing the necessary cathodic protection for the embedded rebar surfaces. Coating performance has been characterized by KSC's Materials Science Laboratory and Beach Corrosion Test Site. Early tests determined that the coating met National Association of Corrosion Engineers (NACE) RP0290-90 100-millivolt (mV) polarization development/decay depolarization criteria for complete protection of steel rebar embedded in concrete. Other tests verified that the embedded rebar became negatively polarized, indicating the presence of a positive current flow with a shift in potential of over 400 mV. Accelerated life tests, tests with chlorides to simulate contamination, and compound optimization tests are currently being performed.

Type of Offer: Licensing



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