The authoritative public forum
  for Metal Finishing since 1989
  

  -----

Plating defect after crimping

2005

Sir,
We have a common problem during the crimping of one of our components.The component is EN1A (yellow passivation) up to 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 you please suggest us whether the white passivation or bleach passivation will be the solution.

The thickness at the crimping portion is 1 mm.

regards,

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

---

2005

Hello Mr Venkat;

There are certain parameters which if maintained 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?

Khozem Vahaanwala
Saify Ind

Bengaluru, Karnataka, India

---

2005

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 [deceased]
- New Delhi, India
With deep regret we sadly advise that Asif passed away on Jan 24, 2016

---

November 16, 2011

We also faced same issue in our product.

plating peeloff found in our sleeve during crimping process

Sleeve : Zinc blue (trivalent chemical 15~20 micron coating thickness) plated

Supplier plating process : 1. alkaline bath plating
2. acid bath plating

Kindly give your recommendation to avoid this problem

regards,
G.Tamil

G.Tamilazhagan
- Coimbatore,Tamilnadu, India