Passivation

The knowledgeable team at Elite Metal Finishing provides quality recommendations and solutions to meet your complicated metal finishing needs.
PROPERTIES

Passivation is used to improve the surface condition of stainless steel by dissolving the iron that is embedded in the surface by forming, machining, or other manufacturing steps. If allowed to remain the iron corrodes and often gives the appearance of large or small rust spots on the stainless steel. In order to prevent this condition on the finished parts, they are given a passivation treatment. This treatment, which consists of immersing the stainless steel parts in a solution of nitric acid without oxidizing salts for a specific period of time, will dissolve the embedded iron and restore the original corrosion-resistance surface by forming a thin transparent oxide film. Passivating is used as the cleaning operation for castings, stampings and finished machine parts by immersing the parts.

Features/Benefits:
  • Stainless steel does not have to be plated to achieve maximum corrosion protection Passivate
  • Provides a superior clean surface
  • No rust discoloration of the stainless steel when in service
  • Surface preparation for other finishes such as priming or painting
  • Passivated stainless steel will not react with other materials because of iron contamination
Applications:
  • In general where iron contamination is detrimental to a part’s performance
  • Sterilization of tools and equipment in the medical field including implants
  • Food industry such as mixers, tanks, handling equipment, shielding, and fasteners
  • In the architectural or marine fields where surface finishes must last for decades
  • Aerospace fuel system controls

FAQs about Metal Finishing

Anodizing is an electrochemical conversion process that forms an oxide film, usually on aluminum, in an electrolyte (chemical solution). Compared to Type II anodizing, the coating applied via Type III anodizing is usually thicker, done at a lower temperature, and more expensive. However, there are benefits to Type III anodizing, such as a thicker coating (typically between 0.001 and 0.002 inches) that tends to be more durable and abrasion resistant.

Anodizing is an electrochemical conversion process that forms an oxide film, usually on aluminum, in an electrolyte (chemical solution).

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  • Anti-static / ESD control – coatings used to minimize static electricity in sensitive environments.
  • Chemical resistant – coatings which resist acids, alkalis, oils, and general chemicals.
  • Conductive – coatings used to form an electrically-conductive layer.
  • Dielectric – coatings made from nonconducting materials used in optical applications. High-reflection coatings consist of a stack of alternating layers of high-and-low refractive-index materials. Each layer in the stack has an optical thickness of a quarter-wave at the design wavelength.
  • Corrosion inhibiting – coatings which prevent moisture from reaching the metal or underlying substrate, or provide a sacrificial layer.
  • EMI / RFI shielding – coatings provide shielding from electromagnetic interference (EMI) or radio frequency interference (RFI).
  • Flame retardant – coatings are flame-retardant in accordance to Underwriters Laboratories, Inc. (UL) Flame Class 94V-0, or other equivalent ISO standards. These materials reduce the spread of flame or resist ignition when exposed to high temperatures. They also insulate the substrate and delay damage to the substrate.
  • Heat resistant – coatings resist damage from heat, or are formulated for use in high-temperature environments.
  • Protective – coatings are designed to protect substrates and surfaces.
  • Touch-up – coatings are used to repair and match the original coating where it has been damaged by scratching, corrosion, abrasion, erosion, scuffing, denting, chipping, delaminating, or other processes.
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