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zinc phosphate Coatings
zinc phosphate is an inorganic compound that is widely used as a corrosion resistant coating on metal surfaces either as part of an electroplating process or as a primer pigment. It has largely displaced toxic materials based on lead or chromium and is now the most commonly used corrosion inhibitor.
In the dental industry, zinc phosphate is used as a luting agent. This cement is made by mixing phosphoric acid liquid with zinc oxide powder to create the correct chemical compound and consistency for the cementation of permanent restorations. Its excellent setting thickness and setting time make it a popular choice among dentists when adhering inlays, bridges, crowns, or other permanent tooth restorations.
The crystalline structure of the zinc phosphate coat makes it an ideal medium for holding oil and waxes as well as for bonding to the base metal surface to create an excellent base for paint or other materials. It also vastly improves lubricity and provides significant corrosion protection by forming an adherent coating on the workpiece to protect it from the corrosive environment.
Cold Forming of Tube and Section
The most common phosphate coating is nitrate/nitrite accelerated zinc phosphate baths formed at 40-75 deg C. These baths have the advantage of a controlled crystalline structure and are generally applied by dipping or spraying processes. In addition, a self-dosing nitrate system can be used.
The coating is used in the manufacture of tubing from un-alloyed or low-alloyed steel with a chromium content up to 4-6%. This coating minimises metal-to-metal contact between tube and die, which reduces the risk of grooving, increases tool and die life and allows higher drawing rates to be used without intermediate heat treatment. A suitable lubricant is usually applied depending on the severity of the forming operation.