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Nickel Plating Turning Blue

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

Pictures would probably help quite a bit. Funny how in an age when cameras are literally within arms reach of 95% of us, so few pictures get taken.

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

(OP)
Id love to freely just get you guys pictures but because these are aerospace parts theres rules about which parts can be shown and which cant so until I can get that information we'll just have to make due.

RE: Nickel Plating Turning Blue

Vindicit...

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

o Trust - But Verify!
o We believe to be true what we prefer to be true. [Unknown]
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation,Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", Homebuiltairplanes.com forum]

RE: Nickel Plating Turning Blue

250-300C is the aging temp for Ni-P.
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?

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

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