Bright Dip for Stainless Steel

Question:

We are looking for a chemical bright dip for parts made of 300 series stainless steel. Do you have any suggestions? L.A.

Answer:

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?