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US 9,115,433 B2Granted
Method for the surface treatment of stainless steel
AssigneePoligrat GmbH
InventorsOlaf Boehme, Siegfried Piesslinger-Schweiger
Life of this patent
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Abstract
In a method for surface treatment of stainless steel, the thermally produced layers of oxide are contacted with a composition effective to dissolve iron ions out of the layers of oxide.
Claims16
A method for treating a surface of stainless steel which includes thermally produced layers of oxide, the method comprising:
- contacting the thermally produced layers of oxide identified by a discoloration on the surface, with a composition including a complexing agent and an oxidizing agent, the composition being effective to selectively dissolve iron ions out of the thermally produced layers of oxide,
- wherein no appreciable ablation of the surface results, and
- wherein full corrosion resistance of the stainless steel is attained immediately after treatment and without requiring any additional passivating treatment or delay time to form new passive layers on the stainless steel.
A method for treating a surface of stainless steel which includes thermally produced layers of oxide, the method consisting essentially of:
- contacting the thermally produced layers of oxide identified by a discoloration on the surface, with a composition including a complexing agent and an oxidizing agent, the composition being effective to selectively dissolve iron ions out of the thermally produced layers of oxide,
- wherein no appreciable ablation of the surface results, and
- wherein full corrosion resistance of the stainless steel is attained immediately after treatment and without requiring any additional passivating treatment or delay time to form new passive layers on the stainless steel.
Dependencies are inferred from the claim text.