Processes

  • Conventional Type II Anodizing (to MIL-A-8625)
  • Hardcoat Type III Anodizing
    (to MIL-A-8625)
  • Teflon Impregnation
  • Alodine 5200
  • Trivalent Chrome Passivation (TCP) for Aluminum and Magnesium (to MIL-DTL-5541)
  • Sub-assembly
  • Industrial Fabrication
  • Heat Treating, Casting Impregnation, Part Washing & Etching

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Engineer Resources

S t a t e   o f   t h e   A r t   L i g h t   M e t a l   F i n i s h i n g

The Engineering Resources section is intended as a source of general information regarding processes performed at AST.  Some products may require non-conventional processing methods to achieve results consistant with customer requirements.  

 After reviewing the information below, feel free to CONTACT US with any further questions you may have.

General Type II Conventional Anodizing Information

 

Colour

Same as alloy (undyed)

Coating Thickness

0.0001" - 0.0008"; minimum of 0.0006" recommended for dyed components

Corrosion Resistance

Sealed Coating >300hrs ASTM  B117

Dielectric

Non-conductive; areas can be masked to allow conductivity after anodizing

Machining

All machining should be completed prior to anodizing

Dying

Type II coatings can be coloured with hundreds of available dyes (inquire for dyes available at AST)

Sealing

Ni-Acetate; note that unsealed anodizing is an excellent adhesive base for painting or epoxy coating

 

 

 

 

 

 

 

 

General Type III Hardcoat Anodizing Information

Hardness of anodic layer 65-70 Rockwell C, 380-430 Vickers.  Hardness decreases slightly if part is sealed after anodizing
Colour (undyed) Darkens as thickness increases, very dependant on material/alloy
Coating Thickness 0.0005" - 0.003"
Machining Hardcoat can be ground, lapped, honed or polished
Dyeing

Hardcoat may be dyed most colours but tends to come out darker then Type II coatings (inquire for dyes available at AST)
Sealing Ni-Acetate.  Sealing Type III coatings slightly reduces anodic layer hardness
Dielectric Hardcoat is non-conductive and will withstand 800 volts per 0.001" of coating thickness
Resistivity

Between 106 - 1012 Ohm per cm

 

Trivalent Chromium Passivation / TCP Information

  • Coatings are RoHS compliant (hexavalent chromium free)
  • Meets MIL-DTL-81706B and is listed on QPL
  • Meets MIL-DTL-5541 (formally MIL-C-5541)
  • If left untreated TCP coatings provide corrosion protection on bare aluminum equal to hexavalent chromium coatings
  • Saltspray testing >168hrs
  • TCP coated components are safer to handle because they do not contain carcinogens
  • Environmentally safe alternative to Alodine 1200
  • TCP coatings produce an excellent adhesive base for paint or epoxy coatings
  • Coating colour ranges from clear to slightly blue/brown, depending on alloy treated
  • TCP can be applied to castings, including die-castings

Application of TCP coatings is typically performed by either immersion or spray.  AST performs immersion processing for all TCP applications.

 

ALODINE 5200

  • Coatings are RoHS compliant (hexavalent chromium free)
  • There is no U.S. MIL-SPEC pertaining to ALODINE 5200
  • Coating colour ranges from clear to slightly blue/brown, depending on alloy treated
  • ALODINE 5200 coatings are an excellent adhesive base for paint or epoxy coatings
  • ALODINE 5200 does not provide bare corrosion protection and is not suitable for use as a protective coating unless used in conjunction with paint or epoxy