Zinc Phosphating

Phosphating is a treatment of steel, galvanized steel at elevated temperatures. Most frequently steel is exposed to the zinc phosphating process. The treatment of the items with phosphate produces fine phosphate crystals on the surface. The fine layer of phosphate crystals boosts the protective capacities of the metallic surface and enhances adhesion. Zinc phosphate processes are carried out before protective coating treatment, for corrosion protection and drawing ease. The phosphating process is applied via immersion or spray.

Zinc phosphate coats better on a crystalline structure than bare metal, so a seeding agent (Activator) is often used as a pre-treatment before Phosphating.
Selection of zinc phosphate solution is done based on coating weight requirement from Low to Heavy phosphate coating weight.


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