Letter 27862

Passivation vs. bead blast  

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My company designs and builds equipment, mainly for the food industry. We have the capabilities to glass-bead-blast our stainless parts for a great finish that our customers our very happy with. However, a customer has inquired into passivation, and if the glass-bead-blast technique achieves the same result. I can see the similarities, but do not have the background to know -- and explain -- for sure.

Any help on this would be appreciated!

Pete Najar
design engineer - Dallas, Texas, USA

If anything, I would think the blast would remove oxides and activate the surface. Anyway, we passivate stainless with a solution of 40-60% nitric acid. 30 min dip.

Mary Cera
- Oklahoma City, Oklahoma

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