Yes, aluminum can be zincated then plated with Electroless Krome (or Flash Copper if desired)
The reaction of zinc die cast/Pot Metal parts to muriatic acid is immediate. It's quite obvious when it occurs. Plating these parts with Flash Copper first will allow you to plate them in E-Krome.
If it doesn't react to acid, and it's not aluminum, then you should feel fairly safe that you can plate it in the E-Krome, particularly if you're referring to metal parts on your bike.
If you want to be safe, Flash Copper everything before plating with E-Krome. You'll also benefit by having a nice thick layer of copper, which can easily be polished to a high shine, underneath your Krome plate.
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