Metal finishing Q&As since 1989

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Higher Zinc Coating on Plates

There is clients requirement of 120 Microns of Zinc Coating on plates of 6 to 10 mm thickness. Some how we are unable to achieve this. Even after getting 120 microns it gets pulled off from the parent material.

Please advice.

UDAY BARVE
Hot-Dip galvanising shop for MS structures - BARODA, GUJARAT, INDIA
2004

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First of two simultaneous responses --

Mr Uday Barve,

Recently we plated 70 Microns zinc from an Alkaline Cyanide free zinc bath on steel parts as a replacement for Hot Dip galvanising. The zinc did not crack on 360 degree bend The zinc adhered very well. The deposit accepts chromate very well. Find a good maker of the latest 6th Generation Alkaline Zinc system in Chennai India. These systems are very ductile and have excellent mechanical qualities, excellent adhesion.

Good Luck,

Asif Nurie [deceased]
- New Delhi, India
With deep regret we sadly advise that Asif passed away on Jan 24, 2016
2004

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Second of two simultaneous responses --

The thickness of the zinc coating depends on a lot of factors like steel composition, temperature of the zinc, composition of the zinc melt (like aluminum and nickel content) speed of taking out the material from the zinc kettle etc. So it is difficult to say what to do. Maybe speed-up (a little bit) of taking out the material from the zinc bath will make the necessary difference.

Dolf van den Berg
- Leusden, The Netherlands
2004