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Hai!
In your letter there is no clear picture about plating. The sustrate
should be Zinc(acid) plated, followed by nickel plating. Then the
thickness sholud be more than 20 micron. If the substrate plated like
that u can achieve the desire colour.
GOOD LUCK
P.KARTHIKEYAN
- Bangalore, Karnataka, India.
Please verify with your chemical supplier latest development in trivalent chromates will help you to achieve with 80 to 90% Jet black finish (aceptable level)
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P. Gurumoorthi |
Parthasarathy,
Please give more detailes about your customer spec. and also full
detailes of what is your plating process.There are lots of
developments happening in Zinc plating.
Alkaline cyanide free Zinc iron plating, followed by trivalent
passivation is the answer.If u come out with more detailes, u will
get good suggestions.
p.S. It is nice to see Gurumoorthi back!
Regards
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T.K. Mohan |
Dear Mr Parthasarathy,
Try doing an XRF analysis of the Nickel - Zinc percentages on the
parts that dont look so good with black. You may find that they have
a higher percentage of Nickel in them
and you may have to increase 2-3% of Zinc in the plated alloy to get
a pleasing black.
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Khozema
Vahanwala |
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