Phosphating for a high-performance and universal surface
There are 4 main reasons for phosphating a surface with DEWE Brünofix.
- Longer service life: Our processes extend the service life of your components.
- Optimum adhesion: The phosphate layer improves the adhesion of paints and varnishes.
- Cost-effectiveness: Reduced maintenance and repair costs.
- Flexibility: Suitable for a wide range of metal substrates and applications.
Did you know that...
- we clean every workpiece of oil residues and impurities to create a perfect phosphate layer?
- our specialised phosphate solutions produce an even, abrasion-resistant coating?
- our phosphate layers are ideal as a primer for subsequent coatings and also improve the sliding properties?
- our method effectively protects oil-treated components from rust?
Phosphating - maximum durability and performance. Rely on our expertise.
Below you will find a detailed description of phosphating
The prerequisite for creating a phosphate coating is the creation of a metallically clean surface. All grease residues (drilling oils, anti-corrosion agents, fingerprints, etc.) and other contaminants on the surface of the parts to be treated must therefore be removed before the phosphating process.
A phosphate layer is chemically generated by immersing the workpieces into a heated and acidic zinc, manganese, zinc-calcium or tri-cation phosphate solution. A chemical reaction occurs through the pickling attack of the metal surfaces with the substrate. This is followed by hydrogen-formation and a shift in pH value on the metal surface. Low solubility phosphates are formed, uniformly distributed across the metal surface as permanently anchored crystallites.
Properties of a phosphate coating:Light to dark grey manganese, zinc or zinc/calcium phosphate coating consisting of secondary and tertiary manganese, zinc or zinc/calcium phosphates.
- Tightly fixed on the base material.
- Fine to coarse crystalline appearance.
- Coating-forming layer (3–20 µm), has to be taken into account for fitting pieces.
- Corrosion protection oils and varnishes can be absorbed very well due to the presence of many capillaries in the coating, resulting in a very high corrosion protection.
- Phosphate coatings are electrically non-conductive, i. e. the insulation resistance is high.
- The phosphate coating can be applied as a corrosion protection or adhesion base for subsequent coating treatments, or varnishes or for improvement of sliding properties to reduce the sliding friction (non-cutting deformation).
- Damaged coatings will hardly be tunnelled by rust.