Surface-coated steel strip
Bonderized steel strip with zinc phosphate coating
We can finish our cold rolled steel strip grades with a zinc phosphate coating on request. This coating is chemically bonded to the surface of the strip and forms a crystalline layer with cavities and capillaries. This results in an enlarged surface that serves as an ideal basis for a wide range of processing and finishing steps. The zinc phosphate coating is the perfect adhesive primer for further varnishes or coatings. In addition, it can serve as a lubricant reservoir for soaps, oils, or greases. The latter is particularly appealing when you require materials with increased strength but still need to form them into the final product. In combination with a lubricant, the zinc phosphate coating reduces friction during forming operations, making complex, multistage forming processes involving harder materials possible. Last but not least, the zinc phosphate coating also helps significantly reduce tool wear.
Optimal formability
Many customers greatly value the excellent formability of phosphate-coated steel strip for the production of complex stamped, bent and formed parts such as needle bearings and bucket tappets in wear-freevalve control systems in automobile manufacturing. Our phosphate-coated steel strip is also used in chainsaw and electric drill components and in the powertrains of utility vehicles.
Application examples for surface coated steel strip
Further applications
Phosphated surfaces - the lubricant layer
The lubricant layer is manufactured in several steps. It ensures optimal material formability and longer tool service lives.
Areas of application
| Application | Property | Type of subsequent processing | Coating on both sides 2 – 6 g/m² |
Coating on one side 2 – 6 g/m² |
Thin coating on both sides 1 – 2 g/m² |
| Lubrication | Extreme reduction of frictional resistance | Soaps * | X | X | X |
| Oils * | X | X | X | ||
| Greases * | X | X | |||
| Adhesive primer | Extreme increase in adhesive strength | Paints | X | X | |
| Colorings | X | ||||
| Organic coatings | X | X | |||
| Inorganic coatings | X | X | |||
| Corrosion protection | Extreme increase in adhesive strength | Organic sealants | X | ||
| Inorganic sealants | X | ||||
| Electrical insulation | Extreme increase in insulation resistance | Variable, depending on the intended use | X |
* Integrated into the production process at Waelzholz
Galvanized surfaces: corrosion protection, conductivity and optical presentation
Zinc: This electrolytic coating provides excellent protection against corrosion. We deliver zinc coated material in both matte and bright finishes. We also offer optional passivation, phosphate coating or organic coating as topcoats.
Zinc-nickel: Zinc-nickel coating ensures long-lasting protection against corrosion. This coating exceeds the effectiveness of a pure zinc coating fourfold while retaining the same coating layer thickness. In addition, it also acts as a bonding agent.
Nickel: Nickel coating is often chosen for visible components, as it has a highly decorative optical effect. It has high corrosive resistance in alkaline environments and has a high degree of hardness.
Copper: Copper coating provides excellent electrical conductivity and is the preferred coating for electrical components.
Brass: Brass coating is primarily used as a decorative coating.
Pewter: In addition to good protection against corrosion, pewter strip is used to manufacture assemblies with joining requirements.
Coil calculator
Whether for cold rolled steel strip, electrical steel strip, or stainless precision steel strip – use our coil calculator to quickly and easily determine the (specific) coil weight, the outer diameter, or the strip length of your coils.