Re: Zinc passivation
I had a bicycle frame zinc electroplated a few years ago. It gave it the yellow colour of the hardware shop nuts and bolts and the rust protection. It was something like £30 for the frame and forks. I looked in the Yellow Pages and there was a place on the local industrial estate.
If not obvious, ask around local painters (powder coaters/sprayers), steel factors or car repairers. They will certainly be able to put you onto someone who does metal finishing. It may seem like there are no people around who do this, but mainly that's because people just look online rather than asking locally. I can't think that if I were a plater I'd have a website - I'm an Architect and haven't got one! Word of mouth does for me, as for them so you may have more luck sleuthing that way.
In any case, talking to someone in the know is worth hours of trawling online, especially if you can show them the pieces you have in mind.
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