Bright Dip for Stainless Steel

Ask an Expert From: Products Finishing, ,

Posted on: 7/1/2001

Question: We are looking for a chemical bright dip for parts made of 300 series 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?

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