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Removal of residual phosphate from DOM steel tubes

I am interested in knowing a popular method for removing phosphate residue of the order of 1 to 2 g/sq.m from DOM steel tubes.The solution should also have anti rust ingredients and be able to do the job in under 5 minutes.Ambient temperature 30 to 35 C is preferable operating temperature.

Regards,

V.Kumaravel
Tube Manufacturer - Chennai, Tamil Nadu, India
2006

2006

Dear Kumaravel,

You can use the following solution for removing phosphate coating on steel tubes:

1 liter of Conc. HCl + 20 g of antimony trioxide at room temperature.

This solution in effective in removing the phosphate coating within 1-2 min. It will have only a minimal attack on the base metal.

T.S.N. Sankara Narayanan
- Chennai, Tamilnadu, India
(ed.note Nov. 2017: The good doctor has a fascinating blog at https://advancementinscience.wordpress.com)

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