Stainless Steel Passivation
Stainless steel passivation is a process that makes stainless steel even 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 fully dissolves the embedded iron without significantly affecting the stainless steel. After the parts have been run through the passivation bath, a passive film forms almost instantly. This passive film further improves stainless steel's natural corrosion resistance.
Benefits of Stainless Steel Passivation
- Improved corrosion resistance without plating
- Superior surface cleanliness
- Eliminates iron contamination reactions with other materials
- No discoloration from rust
- No dimensional change
Passivation & Cleaning Specifications
Arrow Cryogenics certifies to many passivation and cleaning specifications, including, but not limited to:
Please contact Arrow Cryogenics to inquire about other specifications. We can meet the requirements of almost any customer or industry-standard specification.
Testing for Free Iron
After parts have been passivated, Arrow Cryogenics tests the surface for free iron. We use a variety of tests to detect free iron, including high humidity testing, salt spray testing, and copper sulfate testing.
When requested, Arrow Cryogenics will provide certification of passivation and testing.