Phosphating is a common coating technique for metals, and it involves the controlled application of an inorganic phosphate to the metal surface. Phosphates form a protective coating that resists corrosion and provides better adhesion for paint, lubricants, and other coatings.
Phosphating is a common treatment method for many types of steel and other metal surfaces, and it provides many benefits. It improves adhesion of paint layers and other coatings, making them more durable, and it also reduces the amount of force needed to apply these coatings. Phosphating also adds a layer of corrosion resistance, helping to protect the metal surface from the elements.
Before phosphating, the metal surface must be prepared properly, as phosphates do not adhere well to oil and grease. This means that the surface must first be cleaned, typically through chemical-mechanical means, to remove any dirt, oil, and grease. Depending on the composition of the metal surface, different types of cleaning chemicals may be used.
The surface must also be roughened prior to phosphating, typically via sandblasting or chemical etching. This creates small pores and microchannels in the surface that can better adhere to the phosphate. This is important for assuring the best possible adhesion of the phosphate layer to the metal surface.
Following cleaning and roughening, the metal surface is then typically activated via the use of chemicals known as activators, which create a surface to which the phosphate can more readily bond. Following this, the surface is then immersed in a phosphate bath and exposed to an electrical current. This causes the phosphate ions to bond with the metal ions on the surface and form a layer of phosphate.
Finally, the surface is then typically subjected to a hot water rinse which removes any remaining phosphate and other impurities. After rinsing, a corrosion-resistant paint or coating can be applied to the surface, allowing the metal to be used in a variety of applications.
Through the use of phosphating, metal surfaces can be protected from corrosion and made more resistant to wear and tear. This is especially important for components such as fasteners, hinges, and other frequently used parts on vehicles and other machines. As a result, phosphating can be an effective way to increase the longevity of metal components, and ensure proper maintenance of them.
