Phosphating is a chemical process that provides a layer of insoluble phosphates on a metal surface. Because the top layer of the base material no longer contains metal, it reacts differently than the original metal surface. Phosphating can be used as:
- Corrosion protection
- Adhesion improver in paint and adhesive application
- Low glide (smear layer) to the pressing (stamping) of steel (automobile manufacturing)
- Wearing layer in mechanical engineering
C & T Technics has different processes and extensive expertise in iron phosphating and zinc- and manganese phosphating. The difference between iron phosphating and zinc- and manganese phosphating is the structure of the layer. Iron phosphate is not intended to improve the sliding properties and is no additional wear layer, this layer is too thin. An iron phosphate layer is amorphous (formless / no clear crystals) and only serves to improve adhesion and corrosion protection to an additional coating if it is damaged. So to prevent rust creep. This amorphous nature is also the difference between iron phosphate layers on one side and zinc and manganese phosphate layers on the other side.
Ironphosphating
Iron phosphates arise on the steel surface by exposure to a weakly acidic phosphate liquid.
In the area of iron phosphating we are one of the leading companies and we have a long and illustrious history because of the fact that we introduced the multi metal, one component liquid iron phosphating processes on the Dutch market. By optimizing the processes we have managed to extend the lifetime of the bath and by improving the products we reduced massive pollution of the plants.
In a later stage we also introduced waste water free iron phosphating processes by applying 3-fold cascade rinsing systems and reverse osmosis.
We have a wide range of iron phosphating products at our disposal. From fairly thin layers to the so-called thick iron phosphating systems, not only for steel, but also "multi metal" and from almost room temperature up to 55° C.
Zinc and manganese phosphating
We have available the full range of zinc phosphating processes as well as pre-treatment for painting and pre-treatment for coldforming, improving bare corrosion protection and to improve the sliding properties.
In zinc phosphating before painting, the choice can be made between conventional zinc phosphating-, multi-metal low zinc systems, and nickel- and nitrite-free systems, both in immersion and spray application.
For improving the corrosion resistance and sliding properties manganese phosphating systems, which also provide a more decorative finish, can be used.
All these processes need the required pre-treatment and rinsing steps such as degreasing, activating and possibly pickling and passivation.
The exact design of a pre-treatment process is made by our technical field staff in consultation with the client and depends on the quality requirements.
For more information or to make an appointment mail or call us at This e-mail address is being protected from spambots. You need JavaScript enabled to view it or tel. +31-413-331083.
