Material Finish Characteristics

Anodize  
  • Metal: Aluminum
  • Corrosion Resistance: Excellent
  • Color: Clear-dark gray depending on material hardness.
    Tempered alloys can be dyed any color Type I, Class 2
  • Characteristics: Non-conductive
    Good paint base
    Poor abrasion resistance
    Good for close tolerance parts



  • Baking  
  • Metal: High carbon steel—heat treated
  • Corrosion Resistance: None
  • Color: Slight staining
  • Characteristics: Required immediately after electrodeposit plating of parts to prevent hydrogen embrittlement
    Improved hardness



  • Black Oxide  
  • Metal: Steel & Stainless
  • Corrosion Resistance: Indoor—satisfactory, Outdoor—poor
  • Color: Black
  • Characteristics: Poor abrasion resistance
    Supplementary wax & oil dip will improve appearance & corrosion resistance
    No dimensional change of part



  • Cadmium

    Cadmium, Type I

  • Metal: All
  • Corrosion Resistance: Excellent
  • Color: Gray
  • Characteristics: Most commonly used plating


  • Cadmium, Type II

  • Metal: All
  • Corrosion Resistance: Excellent
  • Color: Golden
  • Characteristics: Chromate treatment over Type I
    Excellent resistance to moisture & humidity
    Excellent paint base
    May be chromate treated black, olive drab, or clear but is usually golden (yellow irridite)



  • Degreasing  
  • Metal: All
  • Corrosion Resistance: None
  • Color: No change
  • Characteristics: Removes oils but not solids



  • Bright Nickel  
  • Metal: All
  • Corrosion Resistance: Resistance is a function of thickness, 0.0005 thick provides good resistance
  • Color: Bright silver
  • Characteristics: Good decorative finish



  • Passivate  
  • Metal: Stainless
  • Corrosion Resistance: Excellent
  • Color: No change
  • Characteristics: No dimensional change
    Removes all iron oxide from metal surface
    Light oil after to prevent rusting
    Basically a cleaning process



  • Phosphate
    (rust preventative)
     
  • Metal: Steel
  • Corrosion Resistance: Fair to good
  • Color: Grayish
  • Characteristics: Makes steel more rust resistant



  • Pickling  
  • Metal: All
  • Corrosion Resistance: None
  • Color: No change
  • Characteristics: Cleaner to remove scale, corrosion or rust



  • Silver  
  • Metal: All
  • Corrosion Resistance: Excellent
  • Color: Bright silver
  • Characteristics: Excellent conductivity
    Good decorative finish
    Tarnishes easily
    Excellent solderability
    Excellent lubricity & smear characteristics for anti-galling uses



  • Bright Tin  
  • Metal: All
  • Corrosion Resistance: Good
  • Color: Silver gray
  • Characteristics: Good solderability
    Excellent shelf life
    Not good for low temperature applications



  • Hot tin dip  
  • Metal: All
  • Corrosion Resistance: Good
  • Color: Silver gray
  • Characteristics: Excellent solderability
    Thickness is difficult to control
    Should not be used on irregular shaped parts, ones with deep recesses or parts with tight tolerances after plating



  • Zinc

    Zinc, Type I

  • Metal: All
  • Corrosion Resistance: Very good
  • Color: Bright blue gray
  • Characteristics: Does not maintain bright surface for a long period of time
    Galvanic protection of base metal
    Weather exposure changes zinc to dull gray


  • Zinc, Type II

  • Metal: All
  • Corrosion Resistance: Very good
  • Color: Golden
  • Characteristics: Retards or prevents formation of white corrosion products on zinc surface
    Same as Cadmium Type II


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