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

Zinc, Type III

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