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** Phosphate conversion coating
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** and Phosphate
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Phosphate and conversion
conversion and coating
There are three main ways to passivate these alloys: alclading, chromate conversion coating and anodizing.
Chromate conversion coating is a common way of passivating not only aluminum, but also zinc, cadmium, copper, silver, magnesium, and tin alloys.
* Chromate conversion coating ( chemical film ) per MIL-DTL-5541F for aluminium and aluminium alloy parts
Hexavalent chromium plating solution is used for decorative and hard plating, along with bright dipping of copper alloys, chromic acid anodizing, and chromate conversion coating.
Parkerizing, bonderizing, phosphating, or phosphatizing is a method of protecting a steel surface from corrosion and increasing its resistance to wear through the application of an electrochemical phosphate conversion coating.
Parkerizing is commonly used on firearms as a more effective alternative to bluing, which is another electrochemical conversion coating that was developed earlier.
As for all electrochemical conversion coatings, the Parkerized surface must be completely covered with a light coating of oil to maximize corrosion and wear resistance, primarily through reducing wetting action and galvanic action.
Instead, impact sockets are most commonly finished with a surface conversion of black oxide or other coating to provide corrosion protection and improved appearance over bare steel.
This normally consists of some kind of cleaning process and may include the application of a conversion coating, typically an inorganic phosphate coating.
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