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post #1 of 3 (permalink) Old 08-19-2002, 05:42 PM Thread Starter
 
Join Date: Aug 2001
Posts: 11
chrome problems

I've encountered some problems you guys need to be aware of.
I have been chroming many parts for jap bikes lately and have discovered much of the steel has a lot of Zinc in it to stop it coroding. This means it has to be plated with a cyanide based strike plating (Which I don't have) to get the best results. Be careful which parts you send for plating and if it's steel, make sure your shop has a cyanide bath. Just in case.
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post #2 of 3 (permalink) Old 08-21-2002, 06:18 PM
 
Join Date: Apr 2001
Posts: 499
so which parts have you encountered that have not exactly been prime canditates for routine chroming?

-Also

What effect would the cyanide have on the zinc alloyed with the steel. To my understanding zinc is a rather soft metal (?) so wouldn't the acid bath eat the zinc fairly quickly and pit the metal? Just let me note I have absolutely no idea what I'm talking about... lol
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post #3 of 3 (permalink) Old 08-22-2002, 04:32 AM Thread Starter
 
Join Date: Aug 2001
Posts: 11
Difficult to chrome

We have found Zinc in a rear wheel bushing, rear sprocket, and many bolts used by kawasaki. and also on the rear wheel adjuster, which is a bitch because it is welded to the swing arm.
I have no reason to suspect that their products are any different to other japanese manufacturers. The parts acted like normal steel when dipped in nitric acid, checked with magnets, and during polishing. But we saw the problem immediately the parts went into the nickel tank. Some platers use cyanide based solutions for their Brass or copper strike plate. Cyanide will adhere to Zinc along with the brass or copper to make a solid base for the nickel. Unfortunately our tanks are non cyanide.
A large plating shop should not have a problem. With the bolts we were able to take the zinc off as it was a coating. Zinc is very popular for preventing corrosion. How do you recognise it? Basically if the steel is naked, more than 2 or 3 years old and has no signs of rust, it's probably got Zinc in it. If it is powder coated or painted, then it's tough to tell. I have to try to find a fool proof way to tell if it is present. When I do, I'll let you know.
Oddly enough adding small amounts of Zinc to steel also makes it harder and reduces the need for tempering. But it's still a bitch for us to chrome.
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