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A brief overview of metal phosphating


A partially phosphated wire


Metal Phosphating is the process of applying a layer of chemical compound onto a metal surface and then heating to form a coating. It is often referred to as the ''phosphate process'' because it produces the phosphate finish, which is one of the most durable coatings available and is characterized by a range of shades from gold, purple and brown to bronze, red, and black.

The layers created on the surface act as a protective barrier for the substrate against corrosion. In short, a phosphorous coating enhances the appearance and manageability of metal. There are various types of phosphate coatings and these include: zinc phosphates, iron phosphates and manganese phosphates.

Iron phosphate coatings prepare metal for painting or powder coating. It improves adhesion to the iron or steel substrate and prevents corrosion.

Zinc phosphating is a process that inhibits corrosion in various environments where regular zinc plating is inadequate. It's also used to create a thin coating on metals like steel, brass, copper, and others that have not previously been treated with phosphating.

Manganese phosphate coatings are used for corrosion resistance and lubricity. It is applied only by immersion.


For more information on phosphating or other metal treatment processes:

Call: +27 11 406 4000 or

Email: sales@safic.co.za

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