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| Anodize |
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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
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| Baking |
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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
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| Black Oxide |
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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
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| Cadmium |
Cadmium, Type I |
Metal: All
Corrosion Resistance: Excellent
Color: Gray
Characteristics: Most commonly used plating
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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)
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| Degreasing |
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Metal: All
Corrosion Resistance: None
Color: No change
Characteristics: Removes oils but not solids
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| Bright Nickel |
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Metal: All
Corrosion Resistance: Resistance is a function of thickness, 0.0005 thick provides good resistance
Color: Bright silver
Characteristics: Good decorative finish
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| Passivate |
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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
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| Phosphate (rust preventative) |
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Metal: Steel
Corrosion Resistance: Fair to good
Color: Grayish
Characteristics: Makes steel more rust resistant
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| Pickling |
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Metal: All
Corrosion Resistance: None
Color: No change
Characteristics: Cleaner to remove scale, corrosion or rust
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| Silver |
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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
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| Bright Tin |
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Metal: All
Corrosion Resistance: Good
Color: Silver gray
Characteristics: Good solderability
Excellent shelf life
Not good for low temperature applications
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| Hot tin dip |
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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
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| 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
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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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