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Services - Chemical Pre-Treatment

What is Phosphate?
Chemical Pre-Treated Part

Phosphate means the formation of a layer of zinc, iron, or manganese phosphate crystals on the surface of the part to be painted. It is used in the finishing of iron and steel surfaces and occasionally on aluminum and zinc. The amount of phosphate on the surface is usually expressed as milligrams (mg) per square foot of surface rather than units of thickness. The phosphate layer is generally applied by spray or dipping into a phosphating solution.

A phosphate coating is a transition layer in several respects. It is less dense than most metals but more dense than coatings. It has thermal expansion properties which are intermediate between that of the metal and the coating. The result is that phosphate layers can smooth out the sudden changes in thermal expansion which would otherwise exist between the metal and the paint. Phosphate coatings are porous and can absorb the coating. Upon curing, the paint solidifies, locking into the phosphate pores. Adhesion is greatly enhanced.

Why Phosphate?

Phosphate coatings are used to increase corrosion resistance and improve paint adhesion. Additionally the chemical pretreatment will wash away any dust particle left over from blasting.