316 Stainless Steel Surface Treatment & Coating

1. What is passivation for 316? Nitric acid treatment removes surface contaminants and strengthens the protective oxide layer.

2. Is pickling necessary after welding 316? Yes, to remove weld scale and restore surface corrosion resistance.

3. Can 316 be electro-polished? Yes, electro-polishing improves surface finish and corrosion resistance for hygienic applications.

4. What coatings are suitable for 316? Powder coating for aesthetics; ceramic coatings for extreme temperatures.

5. How often to re-passivate 316? Every 1-3 years in harsh environments, depending on exposure.