mysterious disappearance of material post plating
mysterious disappearance of material post plating
(OP)
We manufacture a Compression spring out of 0.026" tolerance +/-0.0003 wire diameter music wire per astm A228. We send the part out for a commercial thk .12 mil min tin plate. Weird thing occurred when we received the parts back and measured the wire diameter cross section-ally the wire diameter was measuring 0.0251" on average. Could the electroplating process have removed some of the base material? We measured the tin plating thickness at around .2 mil average. We are planning to send the spring out to a lab for evaluation. Just looking for any insight
Thank you
Thank you





RE: mysterious disappearance of material post plating
Are you measuring before and after using the same instrumentation and process?
TTFN

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RE: mysterious disappearance of material post plating
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
Good engineering starts with a Grainger Catalog.
RE: mysterious disappearance of material post plating
We measure the wire diameter cross section before and after plating using a micrometer using the same method.
Tomwalz
A pickling was performed to clean the surface before tinning.
Thank you all
RE: mysterious disappearance of material post plating
RE: mysterious disappearance of material post plating
I was not aware of that. So what effects the remove amount? Would it be time in the bath and acid concentration?
Thank you this really helps
RE: mysterious disappearance of material post plating
RE: mysterious disappearance of material post plating
RE: mysterious disappearance of material post plating
RE: mysterious disappearance of material post plating
RE: mysterious disappearance of material post plating
http://www.eciato.com/PlatingProducts/Plate/Tin_Pl...
TTFN

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RE: mysterious disappearance of material post plating
Yes we have requested this information from the vendor.
RE: mysterious disappearance of material post plating
First Nuvat 6-8 oz/gal tank temp 160-180F
Second Maxamp 8-10 oz/gal tank temp 160-180F
I don't think the cleaning solutions would dissolve the material. Could there be a issue with the plating rectifier?
Below are the processing parameters
Sodium hydroxide 0.9 – 1.8 oz./gal.
Plating bath temperature 110ºF - 145ºF
Electrical current 2-4V/500 amp
Tin concentration 1-3 oz/gal
Tin Sulfate 2-6 oz/gal
Sulfuric Acid 7.2 – 10%
RE: mysterious disappearance of material post plating
When they do this they are removing metal from the surface.
They could have overdone this step by mistake.
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Plymouth Tube
RE: mysterious disappearance of material post plating
RE: mysterious disappearance of material post plating
TTFN

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RE: mysterious disappearance of material post plating
Yes the wire diameter after post plating failed the 0.026 +/-0.0003 spec. The wire diameter was measuring 0.0251 to 0.0258.
RE: mysterious disappearance of material post plating
TTFN

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RE: mysterious disappearance of material post plating
We are waiting for lab results ,so we do not have that info yet.