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Yellow patches on white zinc plating

We are doing white zinc plating on the part (material - AISI 1020). After white zinc plating there comes some yellow patches on the surface of the part. Please guide us why it is happening so and what is the solution.

Sanjay Tyagi
- Delhi, India
2002

"Zinc Plating"
by Herb Geduld
zincplating

on Amazon or eBay
or AbeBooks
(affil link)

Sorry, I've never really heard of the term "white zinc", Sanjay (different areas probably use somewhat different terms). Are you referring to zinc plating with a clear chromate conversion coating? Can you send us a picture of these yellow patches? Cyanide, alkaline non-cyanide, chloride, or ammonia ⇦ on eBay or Amazon [affil link] ted zinc? Barrel or rack plating? Thanks!

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