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Acid zinc plating questions

What can cause finished plated work in acidic bath and blue passivation to be yellowish after some time? And what current is enough for 20 litre bath? my work is acidic zinc bath.

Amadi Cyprain
student - Aba, Abia, Nigeria
2003

Improper rinsing. Current depends on the surface area to be plated, not the size of the tank.

James Watts
- Navarre, Florida
2003

pH control is very important point in chromate bath. Current is controlled by cathode area.

SE DO JANG
- KOREA
2003

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