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Spotting on Zinc Phosphated GI Sheet

We are manufactures of panels, and in our painting line, we face a problem while zinc phosphateing on GI Sheets. White spots appeared on the surface after treatment. It happen only in GI after 7-10 days after fresh bath makeup. Please give a solution

Shihab
Trading - Saudi Arabia
2005

YOU MUST CHANGE YOUR PHOSPHATING SOLUTION,THE KEY QUESTION IS PHOSPHATING FORMULATION.

Mi Dewei
WCSM - Wuhan, China
2005

Hi Dewei,
Could you spend a little more time to explain your idea?
What is the root cause for the white spots forming?
What is its chemical composition and metallurgical structure? How much it affect part anti-corrosion performance?

Thanks,

Bill Wang
- Guelph, Canada
2006

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