Tin or Brass? Contact with Zinc plated, under high humidity. (Air Conditioning unit)

Thanks for the information, appreciate it. Zinc-copper and zinc-brass really bad bad ideas... Now looking for compatible material for the earthing lug. Maybe Tin perhaps...?  (Stainless steel is a good...

Hey there everyone,Got some question on earthing standard. Is IEC Standard ever stated type of material for bolt/screw that shall be clamp with earthing wire?Right now I'm going to use...