Passivation is used to improve the surface condition of the stainless steel by dissolving the iron which is integrated into the surface of the machined or welded metal. If allowed to remain, the iron corrodes and often gives the appearance of rust stains on stainless steel.

This treatment consists in immersing the stainless-steel parts in an acid solution for a specific period of time and temperature. It will dissolve the embedded iron and increase the corrosion resistance on the original surface.

 

Features and benefits:

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• Stainless steel does not have to be electroplated for maximum corrosion protection.

• Provides a clean surface.

• No rust discoloration of stainless steel when in service.

• Preparation of the surface for other finishes such as primer or paint.

• Passivated stainless steel will not react with other materials due to contamination with iron.

 

Applications:

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• In general, when iron contamination is detrimental to the performance of a part.

• Sterilization of tools and equipment in the medical field including implants.

• Food industry such as mixers, tanks, handling equipment, armor and fasteners.

• In architectural or marine fields where surface finishes should last for decades.

• Aerospace fuel system controls.