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Phosphating (zinc-phosphate coating) is a process in which the finished product has gone through a chemical bath creating a self adhered coating. This creates a rust proofing and durability layer for the finished product. This ensures the product is protected and can last until it goes into application in the field. The process is described in summary below.
Phosphate coatings fortify metal surfaces with a crystalline layer, enhancing their readiness for subsequent painting or coating while boosting corrosion resistance and friction management. This treatment also adds rust-inhibiting and anti-galling characteristics to threaded parts when used with oil.
In practice, phosphating triggers a chemical reaction with the metal substrate, creating a robust bond and superior corrosion defense. Our process is optimized for steel components, with specialized zinc and manganese phosphate coatings that provide a durable and protective dark finish.
Removal of grease and oil alkaline conditions (hydroxides, surfactants, emulsifiers)
Rinsing with water
Remove the inorganic residues (rust) acids (hydrochloric acid, phosphoric acid, sulfuric acid)
Rinsing with water
Creation of nucleation on the top layer of metal (titanium salt). This step determines the character much later phosphate layer
Zinc formation of the phosphate layer with phosphoric acid, and zinc salts
Rinsing with water
Protection for the addition of salts (such as chromium salts)
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