Midas Gold Plating Sequence Guide

Description


Midas® Gold Plating Sequence Guide
To plate
onto:
Zinc
AlloysA
Nickel & Nickel Alloys, Steel** Stainless
Steel
Brass, Bronze, Copper
Silver, Tin Alloy
Gold, Platinum
Step 1 Electroclean
very briefly
Electroclean Electroclean Electroclean Electroclean
Step 2 Rinse,
Acid dip,
Rinse
Rinse,
Acid dip,
Rinse
Rinse,
HCI Dip,*** Rinse
Rinse,
Acid dip,
Rinse
Rinse,
Acid dip,
Rinse
Step 3 Copper
Strike
(extra thickB)
Copper
Strike
Stainless
Steel
Activator
Preplate with nickel* Plate with Gold
Step 4 Rinse,
Acid dip,
Rinse
Rinse,
Acid dip,
Rinse
Rinse,
Acid dip,
Rinse
Rinse,
Acid dip,
Rinse
Rinse,
Acid dip,
Rinse
Step 5 Preplate
with nickel
Preplate
with nickel
Optional Preplate with
nickel
Plate with
Gold
 
Step 6 Rinse,
Acid dip,
Rinse
Rinse,
Acid dip,
Rinse
Rinse,
Acid dip,
Rinse
Rinse,
Acid dip,
Rinse
 
Step 7 Plate with
Gold
Plate with
Gold
Plate with
Gold
   
Step 8 Rinse,
Acid dip,
Rinse
Rinse,
Acid dip,
Rinse
Rinse,
Acid dip,
Rinse
   

A. Use a very brief electrocleaning step for zinc. Longer durations in electrocleaning solution will open pores (porosity), causing blistering during subsequent plating steps.

B. When copper-plating zinc, the copper deposit must be thick enough to prevent gassing during the acid dip step. If gassing does occur, rinse well and plate with more copper. Then repeat acid dip and following steps.

* When plating gold over silver or any base metal (such as brass, copper, bronze, nickel silver or white metal), a nickel underplate is recommended. This prevents the plated object from tarnishing through the gold plate and changing the surface color. Because nickel will not adhere to some base metals, copper is sometimes used as the first underplate, followed by nickel, then gold.

** Copper and nickel pre-plate over steel provide durability and act as a barrier against rusting; however, gold will adhere directly onto steel if desired for a specific application.

*** HCI dip is a 20% hydrochloric acid solution.