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What is Metal Finishing?
The purpose of metal finishing is decorative and for corrosion protection of steel.
Chem-Plate Industries focuses primarily on corrosion protective coatings, though many coatings also provide a decorative quality.
 
There are two types of corrosion protection coating mechanisms in general use in the industry. The first type is a protective barrier coating which covers the steel, including any kind of paint and certain metals. The barrier coatings can be applied by spraying, dipping, electroplating, mechanical plating, and thermal diffusion (ArmorGalvTM). Chem-Plate Industries performs all of these processes with the exception of Racking, and Hot Dipping.
 
The second type of corrosion protective coating is known as “sacrificial” coating. In essence, when a steel part is coated with a “sacrificial coating” the coating material itself begins to corrode before the underlying steel and the steel will not corrode until the coating is compleatly gone. The photo below illustrates how this works.
  
When the barrier coating is damaged or compromised, the
exposed steel begins to corrode immediately.
When the sacrificial coating is damaged or compromised, the
exposed steel does not begin to corrode until all of the
sacrificial coating is corroded away.
SACRIFICIAL COATINGS
 
Zinc
Zinc/Iron Thermal Diffusion
Zinc/Nickel
Cadmium
Aluminum
Magnesium
BARRIER COATINGS
 
Paint
Nickel
Copper
Brass
Tin
Silver
 
A sacrificial coating may be further protected with an additional barrier coating to further enhance corrosion resistance; or, add mechanical properties such as lubricity, scratch resistance, and decorative colors. See the Spec Approvals page for process packages that contain both a sacrificial coating and barrier coating, such as GM 4205.
 
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