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White spots on olive green passivation

Q. Request for help . We have acid zinc (chloride) barrel there is major problem from last 5 month's , after olive green passivation,white spots on components, (patches)what the reason for that?

Manishpande
electroplating - Nagpur, Maharashtra, India
2003

A. Dear Manish,

The reasons I can think of:

1. Raw material porosity hence spotting.
2. Better washing/ rinsing of parts is required between plating and passivation.

Khozem Vahaanwala
Saify Ind

Bengaluru, Karnataka, India

2003

A. White Spots in Acid Zinc are due to metallic impurities in solution. Please treat with H2O2 or zinc dust [on eBay or Amazon] treatments. This will solve the problem.

RAMCHANDRA TALWANDE
- Aurangabad , Maharastra (INDIA)
February 24, 2014

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