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Extra resources for Electromagnetic Shielding and Corrosion Protection for Aerospace Vehicles
Sample text
For aluminum substrates, a particularly promising material that was identified was silver-coated aluminum. 1) and, thus, was expected to have superior corrosion characteristics when used on aluminum substrates. 2. These six conductive sealant materials were therefore selected for evaluation under accelerated environmental test conditions. A salt fog exposure environment per ASTM B117 was selected to simulate accelerated weather conditions. The de resistance and shielding effectiveness of the test joints and the control joints were measured before weathering tests began and periodically during the weathering tests to determine the relative degradation in electrical performance as a function of exposure time in the salt fog environment.
A side view of the stainless steel test jo int is shown in Fig. 3. During resistance and shielding effectiveness tests, the air gap (visible in the side view of Fig. 3) was filled with conductive sealant of varying resistivity. A rear view of the stainless steel test joint after loading with conductive sealant is shown in Fig . 4. 5 mf). These materials consisted of silver powder dispersed in urethane resins at different volume loadings to vary the resistivity. One sealant was a two-part urethane, whereas the other four sealant types were moisture-cured urethanes.
Consequently, the use of shielding effectiveness measurements was carefully assessed in terms of its feasibility and applicability to bonding effectiveness evaluation of the conductive sealant materials. An approach, which was applicable to the present problem, is to measure the transfer impedance of the conductive sealant bonds over a wide frequency range. Transfer impedance measurements made over a broad frequency range and at several different points along the length of the joint would provide a better indication of bond effectiveness than a de resistance measurement.