Accession Number : ADD017304

Title :   Method of Forming a Corrosion-Resistant EMI Shielding Gasket Between Graphite and Metal Components.

Descriptive Note : Patent, Filed 2 Apr 92, patented 15 Nov 94

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Panayappan, Ramanathan ; Cooper, John C

Report Date : 15 Nov 1994

Pagination or Media Count : 5

Abstract : A composition is disclosed for forming an EMI shielding gasket for installation against a metal object, such as an aluminum frame member of an aircraft, wherein the composition is comprised of a mixture of a prepolymer composition of a flexible polyurethane material, a sacrificial metallic material which provides electrical conductivity and anodic protection against corrosion of the metal object, and a curing agent for curing the prepolymer composition. The sacrificial metallic material can be a metal salt selected from the group consisting of water soluble zinc and cadmium salts. Water can also be present to serve two functions, as a curing agent for the polyurethane and as a foaming agent, producing carbon dioxide. A method is also providing for installing an EMI shielding gasket on an aircraft between a graphite skin panel and a metal frame member. The composition for forming the EMI shielding gasket on a metal surface can also include an agent that cleans the metal surface to which the gasket is applied. (jg)

Descriptors :   *METALS, *GRAPHITE, *CORROSION RESISTANCE, *ELECTROMAGNETIC INTERFERENCE, *SHIELDING, *GASKETS, *PATENTS, FUNCTIONS, AIRCRAFT, WATER, MATERIALS, PANELS, ELECTRICAL CONDUCTIVITY, SURFACES, AIRFRAMES, PROTECTION, ZINC, CADMIUM, SALTS, SOLUBILITY, CARBON DIOXIDE, CURING AGENTS, POLYURETHANE RESINS, ANODIC COATINGS, FLEXIBLE MATERIALS, FOAM

Subject Categories : Inorganic Chemistry
      Aircraft
      Physical Chemistry
      Metallurgy and Metallography
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE