Zinc Phosphate Coating

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zinc phosphate is a crystalline coating that is used for preventing corrosion on metals such as steel. Its chemically produced coat is resistant to galvanic corrosion, flaking and UV rays.

It is used to coat a variety of materials, including steel and aluminum. It is typically applied using spray, dip or flow coating methods.

Corrosion Resistance

zinc phosphate is more than twice as resistant to galvanic corrosion than hot-dipped galvanization, even at a thin coating thickness. It also prevents current flow when the surface is exposed to electrochemical fields.

In a wire drawing machine, zinc phosphate can reduce tool and die wear, extend their working life and increase the production rate. It has superior adhesion to steel and is able to survive repeated passes through a die without breaking.

It can be deposited with a spray or immersion bath process, or it can be post treated with a surface conditioner/sealer to further enhance corrosion resistance and paint adhesion.

Henkel’s BONDERITE(r) range of pre-treatment solutions promote optimal adhesion and surface conditioning for all types of metal substrates prior to a zinc phosphate conversion coating application. This range includes traditional tri-cationic, 2-step and nickel-free products.

In the case of the BONDERITE(r) spray or immersion zinc phosphate process, the surface is conditioned first with an aqueous solution that removes oil and grease, followed by an aqueous solution that dissolves heavy minerals and dirt. Then, a proprietary zinc phosphate solution is sprayed onto the surface. The zinc phosphate solution changes the topographical and chemical nature of the surface by depositing a dense polycrystalline conversion coating containing iron, manganese and nickel. The coating then provides a solid foundation for painting or other organic coating processes.

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