Antenna hardware often combines aluminum with stainless steel. Both
materials are anodic and the potential difference is low. Cadmium plated
bolts are not much greater difference and can be used. Brass and gold are
at the opposite end of the spectrum (cahtodic) and offer more potential for
corrosion - although inside there is often little problem. Electrolysis can
sometimes be seen with aluminum chassis and iron based lockwashers in ham
gear that has been sitting in a damp basement for 40 years. If you plan on
doing that with your amp, try to stick with stainless steel. Or you could
coat the fasteners with an anti-corrosion material like they do in auto
engines during assembly.
Colin K7FM
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