Passivation is often the final step in the finishing of medical implants. Passivation is the process of making a material more corrosion resistant, usually by the formation of a thin layer of oxide that adheres tightly to the metal surface. This “passive” layer is usually an oxide that is a few nanometers thick. A typical passivation involves processing the parts in nitric acid followed by multiple water rinses. This process will remove free metal ions, foreign material and laser-cutting or welding-generated compounds (e.g. oxides) and restore the passive oxide layer. Alternatively, the parts may be passivated by electropolishing.
Passivation can be performed per your specification, or by an appropriate industrial standard as specified on your purchase order.
At Laserage, we adhere to the following industry standards:
- ASTM A967: Standard Specification for Chemical Passivation Treatments for Stainless Steel Parts
- ASTM B912: Standard Specification for Passivation of Stainless Steels Using Electropolishing
- ASTM F86: Standard Practice for Surface Preparation and Marking of Metallic Surgical Implants
As an alternative to this process, parts and components can be passivated through electropolishing.