A Study of Zn/Sn EMI (Electromagnetic Interference)-Seal Material
1986
Agarwala, Vinod S. | Paciej, Richard | Thompson, James J.
Electromagnetic interference (EMI) seals are required for the Navy's F/A-18 aircraft because of the high electromagnetic environment present on aircraft carriers. A major component used in the EMI seal is a 20% Zinc/Tin- spray coating on a Aluminum alloy substrate. This is continuously exposed to the marine environments causing major structural damages. Pits up to 35 mils deep on the Al alloy have been observed under the seal after one year of service on F/A- 18 aircraft. A study of this 20% Zn/Sn arc-spray coating material was made to evaluate its compatibility with the substrate metal in marine environments. Glass bead blasting and Corrosion Preventative Compound, MIL-C-81309, were investigated as a possible post-treatment of this coating to increase service the life of the EMI seal.
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