We are looking for a chemical bright dip for parts made of 300 series stainless steel. Do you have any suggestions? L.A.
Here is a formulation that may work for you. It was taken from the Electroplating Engineering Handbook, 4th ed., edited by Lawrence J. Durney, Metal Finishing Publications, 914-333-2578.
- Hydrochloric acid 29.5% (by volume)
- Sulfuric acid 40.0% (by volume)
- Nitric acid 0.5% (by volume)
- Titanium tetrachloride 5.5%
- Water 24.5%
The solution is used at 160-170F. The dipping time is 2-5 min. The amount of metal removed is approximately 0.0004 inch.
Have you considered electropolishing as an alternative to chemical bright dipping?