Letter 35086

Plating defect after crimping [India] 

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Sir,
We have a common problem during the crimping of one of our components.The component is EN1A(yellow passivation)upto 13 microns.We notice a plating peel off at the crimped portion.The tool used for the crimping was highly polished and then checked but the improvement was not good enough.Could u please suggest us the weather the white passsivation or bleech passivation will be the solution.

The thickness at the crimping portion is 1 mm.

regards,

S.S.venkata raghavan
Engineering (Autoproducts) - Coimbatore

Hello Mr Venkat;

There are certain parameters which if mantained well should give you a ductile zinc deposit whilst plating. For this we should know which process was used for plating. Also if crimping can you not think about a lower thickness between 5 - 8 microns?

Khozema Vahanwala Automaxx   Bangalore, Karnataka, India

Mr Venkat,

Is the zinc peeling off the base metal.
Or is the chromate peeling off the zinc ??

Confirm this aspect visually first.
Solutions abound after this identification.
Which process do you use to plate zinc.
Alkaline. acid. cyanide ??
What process sequence do you follow ?
With replies to these queries I could help .
Regards

Asif Nurie Atlanta Global Limited New Delhi, India

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