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Phosphating procedure

2005

We are into manufacturing of car panels used in lifts and control panels and into other sheet fabrications. We are 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 are 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
- Cerovski vrh Croatia
2005

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
(ed.note Nov. 2017: The good doctor has a fascinating blog at https://advancementinscience.wordpress.com)
2005

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