Stainless Steel Passivation
Stainless steel passivation is a process that makes stainless steel less susceptible to corrosive environmental factors such as air and water. While stainless steel is corrosion-resistant by nature, it is not entirely impervious to rusting-iron embedded in the surface during part forming and machining can corrode and create rust spots on the stainless steel, called rouging.
In stainless steel passivation, exogenous iron and/or iron compounds are removed from a stainless steel surface. Passivating improves the condition of part surfaces by removing surface contaminants in a chemical bath. This chemical bath dissolves the embedded iron without significantly affecting the stainless steel. After the parts have been run through the passivation bath, a passive film is spontaneously formed. This passive film improves the stainless steel's corrosion resistance.
Benefits of stainless steel passivation:
- Improved corrosion resistance without plating
- Superior clean surface
- Eliminates iron contamination reactions with other materials
- No discoloration from rust
- No dimensional change
*No dimensional change
Arrow Cryogenics certifies to many passivation and cleaning specifications, including:
These are just some of the specifications we certify to. Please contact Arrow Cryogenics to inquire about other specifications.
Testing for the detection of free iron and cleanliness
After parts have been passivated, Arrow Cryogenics has the capability to test for free iron on the surface. We use several different tests for free iron, including High Humidity Testing, Salt Spray Testing, and Copper Sulfate Testing.
When requested, Arrow Cryogenics will provide certification of passivation and testing.