Passivation

What is Passivation?
Passivation is a chemical process used to remove embedded iron and iron-based contaminants from the surface of stainless steel. This is done through a controlled acid bath that cleans the surface without altering the base metal itself. Once the contaminants are removed, a passive oxide layer forms naturally on the surface, significantly increasing the metal’s resistance to corrosion. The result is a chemically stable, rust-resistant surface that performs reliably in critical environments.

How It Works
During machining or forming, stainless steel parts can pick up trace amounts of iron from tools or other sources. If not removed, this iron can corrode and cause rust-like discoloration, even though the base metal is corrosion-resistant. Passivation removes these contaminants and restores the stainless steel’s natural protective properties. The process is non-electrolytic and typically uses nitric or citric acid-based solutions to achieve a clean, passive surface.

Benefits of Stainless Steel Passivation

• Enhances corrosion resistance without the need for plating or coating
• Creates a clean, bright surface ideal for further finishing or assembly
• Removes surface iron contamination that can trigger unwanted chemical reactions
• Prevents rust discoloration and staining on exposed stainless steel
• Prepares surfaces for optimal primer and paint adhesion

Where It’s Used
Passivation is commonly used in industries that require high-performance stainless steel parts, including aerospace, medical, food processing, marine, and chemical manufacturing. It’s especially valuable in applications where appearance, hygiene, and resistance to corrosion are critical.

[REQUEST A QUOTE TODAY]