Coatings

Zinc

With a galvanic unalloyed zinc coating, Cr(VI)-free passivated, metal parts can be economically protected against corrosion. In a zinc electrolyte under application of direct current thin, in micron range lying zinc layers are given off. The layer thickness can be influenced and controlled by the amperage and the time of exposure. The targeted layer thickness and the follow-up Treatment depend on the purpose of the part in question and are often defined and determined by standardization. With a subsequent passivation and an optional sealing the corrosion resistance of the zinced parts is improved considerably. The following Cr(VI)-free passivations are available:

  • thin-film passivation (DÜSP)
  • thick-film passivation (DISP)

Application

Low to medium corrosion resistance, i.e. car interior , electronics, mechanical engineering, construction. High corrosion resistance when used as basecoat for an additional lacquer coating. Deformable variations available.

Suitable materials

All steels except stainless steel.

Application examples

Brackets, housings, manifolds, clamping rings, oil pans, sieve pipes.

Zinc-Nickel

Thanks to alloying the galvanic zinc coating with nickel during the electrolysis, layers of high corrosion protection are reached. Our process is oriented to the current standardization. Zinc-nickel was proven in many cases to efficiently avoid corrosion on contact points when used together with aluminium parts. As a Cr(VI)-free passivation we offer a transparent passivation for parts treated on rack or in drum installations and also a black passivation on rack installations.

Application

High corrosion protection, i.e. engine compartment and chassis, high humidity or salty air. Very high corrosion resistance when used as basecoat for an additional lacquer coating. Limited Deformability.

Suitable materials

All steels except stainless steel.

Application examples

Pipes, Housings, Levers, Handles.

Zinc flake coating

Zinc flake coatings are non-electrolytically applied coatings, that offer a very high corrosion protection through a cathodic protection. The coating consists of a mixture of zinc- and aluminium-flakes, which are connected through an inorganic matrix. We have a wide variety of products available for this kind of coating. Corrosion protection depends on the used product and the layer thickness. What all our products have in common is material efficiency and that they offer good protection even with thin paint layers. A zinc flake coating does not require a bating process as pre-treatment which makes it suitable for high strength parts with a tensile strength of >1000 N/mm2, > 320 HV or screws and bolts higher than property class 10.9. The risk of hydrogen embrittlement induced fractures caused by the surface treatment can be excluded.

Application

High corrosion protection, i.e. interior and exterior of automobiles, wind power incl. offshore, mechanical engineering, railway engineering. Very high corrosion resistance when used as basecoat for an additional lacquer coating.

Suitable materials

All steels. Aluminium

Special features

Coating of large bolts and screws up to 3 meters in length.

Application examples

Bolts, studs, brackets, screws, nuts.

Wet Lacquer Coating

Wet lacquer coating refers to all processes where some form of liquid coating is applied by spraying. These coatings can be solvent-based or water-based. Depending on the application the coating can be air-drying or heat drying – to lower and higher temperatures. Wet lacquer coating does not only offer a vast selection of colours (RAL) but also different functionalities, i.e. deformability, dry lubrication, noise reduction, temperature resistance, décor, chemical resistance, fuel resistance, UV radiation, electrical insulation, good adhesion for rubber and many more. We can provide suggestions on what lacquer to use and what pre-treatment is best suited based on the later application and use of the part in question. Many costumers also take use of the possibility to state which lacquer product is released for their product and we check the suitability.

Application

All industries according to specifications. Medium corrosion resistance, high and very high corrosion resistance when used as topcoat on an additional galvanic layer or on zinc lamella coating.

Suitable materials

All steels and Aluminium. Other non-metallic materials on request.

Special features

Coating-free areas necessary? We have a vast assortment of masking equipment available and are able to develop customer specific masking solutions.

Application examples

Bolts, studs, nuts, pistons, rubber metal bonding, springs, silencers.

Powder coating

Powder coating is a coating procedure where a electrically conductive material is coated with powder paint. Powder paint generally consists of dry, grainy particles, which are mostly based on epoxy or polyester resins. Powder paint is applied electrostatically. The charged particles gather on the surface of the part and stick to it electrostatically. During the subsequent burning process the particles gel into the actual powder coat. Powder coating required no solvents which makes this process environmentally friendly.

Powder coatings have similar properties as the above descripted properties of wet lacquer coatings. They are always heat dried and normally have a higher layer thickness.

Application

All industries according to specifications. Medium corrosion resistance, high and very high corrosion resistance when used as topcoat on an additional galvanic layer or multi-layered.

Suitable materials

All steels and Aluminium.

Special features

Coating-free areas necessary? We have a vast assortment of masking equipment available and are able to develop customer specific masking solutions.

Application examples

Brake calipers, clamping rings, exhaust pipes.

Duplex coatings

Duplex Coatings are the combination of a metallic coating (basecoat) and an additional lacquer coating (topcoat). Application of this technology aims to unite at least two coatings on one surface in that way, that all strengths of the individual coatings take full effect and their weaknesses are compensated for. One example would be the combination of galvanic zinc with an subsequent lacquer coating on a steel part: Zinc with its cathodic corrosion protection has the property that it sacrifices itself by corroding instead of the base material. This protects the base material from corrosion damages but the sacrificial property of zinc is limited. A lacquer coat does not have this special property. Would there only be a lacquer coating and would it get damaged the base material would be unprotected and vulnerable for corrosion. In the duplex combination the lacquer is able to protect the zinc layer and if the lacquer is damaged the zinc prevents the corrosion and delays the infiltration with corrosion under the lacquer coat.  These and many other property-combinations are possible. To reach these the interface between the individual layers has to be perfectly harmonized. ANSORGE has decades of experience and you receive everything from one source.

Application examples

Bent pipes, beadplates, footboards, vibration dampers.