Nickel Plating Turning Blue
Nickel Plating Turning Blue
(OP)
Hi all, I have parts being Nickel plated to AMS 2424 about 0.002-0.004 thick and being shipped over seas from the UK to the US. They have a post plating heat treatment thats at something like 900F (500C) for an hour. Typically theres a good amount of my parts that have a blue blotchy stain on them. What can turn Nickel blue? Is it a tarnish? Is it from acids or oils? People handling parts with their bare hands? Is it the heat treatment?





RE: Nickel Plating Turning Blue
900F is awfully high temperature for a post-plating hydrogen bakeout. But I would expect an oxide tint to be pretty uniform over the whole part, not blotchy. Does the color wipe off with water, alcohol, ammonia water, or vinegar?
RE: Nickel Plating Turning Blue
RE: Nickel Plating Turning Blue
AMS2424 does NOT specify a post-plating bake anywhere close to 900F. WHY are You doing the post-plating bake?
I assume that the base metal is tolerant of the 900F bake, such as 9-Ni-4Co-.3C [etc], A286, etc?
Regards, Wil Taylor
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RE: Nickel Plating Turning Blue
Are you sure that it isn't 500F and not 500C?
There are plenty of Ni compounds that are blue, I am guessing residue from cleaning or plating.
Does it wipe off? Is it on the surface, any loss of adhesion?
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