Letter 34086

Phosphating procedure [India]  

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We r into manufacturing of car panels used in lifts and control panels and into other sheet fabrications. We r facing problems due to lack of knowledge of powder coating and especially chemical process/ measures to ensure good layer before powder coatings.

Kindly detail us process of chemical phosphating how and what chemical to be used and temp they will work. we r using CRC sheet and aluminum also.

Regards,

Rajeev Abbott
elevator co. - New Delhi, Delhi, India

Letter 34052 is something for you Rajeev. Or buy proprietary process (much better).

Good luck!

Goran Budija
- Zagreb, Croatia

Rajeev, Zinc phosphate coating is the proven pre-treatment coating for improving the adhesion of organic top coats over steel and aluminium. It is also a good pre-treatment for powder coatings.

Zinc phosphate coating on steel can be obtained using a formulation that contains a zinc salt, phosphoric acid and an accelerator. The deposition temp. is around 90-95 deg.C. The time for paint base coating is about 30 second to 2 minutes.

Many commercial formulations are available in the market.

T.S.N. Sankara Narayanan
- Chennai, Tamilnadu, India

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