When machined, welded, heat treated or otherwise processed stainless steel parts can be left with free iron and other contaminants in the surface. The presence of these reactive metals in the surface reduces the corrosion resistance of stainless steel alloys. The passivation process removes these contaminants and forms an oxide layer rendering the work piece surface passive (non-reactive). Different methods of chemical passivation work better for the many different grades of stainless steels. Coating Technology is now offering a medium temperature nitric acid passivation process which is required to process many austenitic and ferritic stainless steel alloys.
The passivate specifications we can process and certify to include:
- AMS 2700 Method 1, Types 1, 6 & 7 with verification testing per Methods 102 & 104
- ASTM A967 Nitric 2 and Nitric 3 with verification testing per Practices C & D.
- QQ-P-35 Types VI & VII
- ASTM A380 Codes F & H
If you would like a price quote or additional information for any of these services please use the “Quick Contact” link on this page or give us a call.