Not so far ... but I would like to try. I've done some "Parkerizing" but that does not protect nearly as well as blackened Zinc.
I've also done some "gold" chromating over Zinc with sodium dichromate, works good sometimes, not so good other times, yet to figure it out. Did some clear chromate over Zinc using an Eastwood product (I think, could have been Caswell) which worked ok.
Every now and then you get lucky and a gold/yellow dichromate dip over zinc will turn out with that perfect iridescent finish, but mostly I end up with a yellow/gold tone similar to a factory carb that has sat for a few years.
Problem with the Sodium dichromate (Hex-a-whatever) is it's very toxic, you don't want to get it on you or inhale it or anything. And it's not something you want to dump on the lawn out back. Manufacturers have moved to a Non-Hex dichromate that is not as toxic.
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