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Etching mild steel tubing for good adhesion of urethane coating

Q. I need to etch the surface of tubing so I can apply a urethane coating, currently I am sandblasting the tube to give the primer something to bite to. I would like to get away from sandblasting, any ideas would be much appreciated.

Thanks

Todd Brennecke
manufacturing - Ixonia, Wisconsin, USA
October 24, 2008

A. Probably abrading its surface in a belt sander equipped with a coarse grain.

Guillermo Marrufo
Monterrey, NL, Mexico

A. SIMPLE! Do Zinc Phosphating if the components can be dipped, or other spray phosphating techniques are available, find out in your area of operation.

But the answer is Zinc Phosphating

Shankar Omprakash Khandelwal [deceased]
- Coimbatore, TAMILNADU, INDIA
It is our sad duty to pass along the information that the knowledgeable Mr.Shankar was lost to Covid/Corona.
He was awarded with honorable medal by then Indian president Ms. Pratibha Patil. R.I.P.

A. Maybe you could consider an etch primer.

Brian Terry
Aerospace - Yeovil, Somerset, UK

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