No, there is no consensus standard (ASTM, ISO, etc.) for applying zinc coatings on copper-based metals. ASTM B 281 describes the standard practice for preparing Cu-based metals for electroplating, so that is certainly a valuable reference, but it will not detail anything about the actual deposited coating such as thickness, corrosion resistance, adhesion, etc. I agree with btrueblood in wondering why one would want to apply a zinc coating to a 360 brass.
