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Plating Bubbles

Dear sir,
We are the leading manufacturers of sheet metal industries,but we are unable to give the better quality because of plating problem.After processing we are doing Zinc plating with yellow passivation to protect corrosion nevertheless we have complaints from customer

* After some time bubbles noticed on the plated surface.
Can you suggest what is the problem bubbles are occurring and whats the solution to solve this problem.

K.DHILIP KUMAR
- Bangalore,KARNATAKA & INDIA.
2007

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First of two simultaneous responses --

Mr Kumar,
We would need more information to help you. Base material, pre-clean steps, what kind of Zn bath you are using (acid or alkaline). Bubbles or blisters are usually caused by poor cleaning practices. Please give us additional info.

Mark Baker
Process Engineer - Syracuse, New York
2007

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Second of two simultaneous responses --

Dear Mr. Dilip Kumar,

You have not provided any details about pre-cleaning process, type of zinc plating (Acid/Cyanide/alkaline non-cyanide). Most of the time such problems are due to poor Or wrong pre-cleaning process.

Ramesh Khare
- Mumbai
2007

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February 20, 2012

Dear,

Im also facing bubble problems in cyanide zinc plating. But I'm not getting in all types of pieces. I get bubbles in only one type that is in "L" Shape MS Sheet (Size: 300(w)X600mm(l)).

My plating steps are as follows.

1. Degreasing.
2. Water Rinse.
3. Pickling (Hydrochloric Acid)
4. Water Rinse.
5. Cyanide Zinc Plating.

Shahid Ahmad
- Dubai