Accession Number : ADA307706

Title :   Field Application of EMI Coatings Investigation of Coating Materials and Stylus Electroplating Protocols for Shielded Facilities.

Descriptive Note : Final rept.,

Corporate Author : CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN IL

Personal Author(s) : Stephenson, L. D. ; Donoho, L. H.

PDF Url : ADA307706

Report Date : MAR 1996

Pagination or Media Count : 125

Abstract : To maintain reliable electromagnetic interference (EMI) shielding for electronic equipment shelter interfaces, mating surfaces such as doors and interfaces must provide low contact resistances and be resistant to excessive amounts of corrosion and mechanical wear that would tend to degrade their shielding integrity. The objective of this research was to establish the efficacy of stylus electroplating as a potentially viable field maintenance/repair technique for application of corrosion resistant, wear resistant coatings in order to help maintain the shielding integrity of those interfaces. Aluminum alloy (6061-T6) knife-edge and channel test pieces were stylus electroplated with tin or tin-lead coatings with nickel or copper underlayers. A custom-designed electroplating tool developed for electroplating the complex geometry of a knife-edge substrate appears to provide better control of the plating process and circumvents possible interference with previously deposited areas. This research has resulted in an optimized procedure for producing coatings that exhibit greater adherence, better uniformity, less scarring, and fewer blisters and ridges compared to those previously reported. An optimum electroplating strategy is suggested, which includes applying tin or tin-lead top layers over a thick layer of copper and a thin nickel strike.

Descriptors :   *METAL COATINGS, *ELECTROMAGNETIC INTERFERENCE, *PROTECTIVE COATINGS, *ELECTROMAGNETIC SHIELDING, *ELECTROPLATING, ALUMINUM ALLOYS, SHELTERS, ADHESION, ELECTRONIC EQUIPMENT, CORROSION INHIBITION, COPPER, TIN, NICKEL, HARDNESS, ELECTROMAGNETIC PULSES, WEAR RESISTANCE, GASKETS, TIN COATINGS.

Subject Categories : Electromagnetic Shielding
      Coatings, Colorants and Finishes

Distribution Statement : APPROVED FOR PUBLIC RELEASE