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ZWEZ ...

... has been developing products and processes for surface treatment for more than 70 years. The family owned and managed company acting upon the maxim "Functional Coatings on Metal" is always focused on the needs and demands of the market and its changes for more than 70 years.

These are the reasons why ZWEZ has the appropriate products always at the right time, as the last seven decades show.

ZWEZ customers always work successfully with the most innovative and environment-friendly technologies.
ZWEZ technologies have not only followed the market for more than 70 years, product developments have again and again set new standards in innovative trends and eco-friendliness, which the market has followed up.

Also with regard to customer relationships and their particular requirements concerning support we set standards: workshops at the customer's plant, in house workshops and the PRO-meetings, monitoring of plants with analysis (service-lab) and two pilot plant stations in Lindlar (ZWEZ-Technikum) for “filming” various shapes and sizes including coils of wire and tubes at the industrial scale.

To be part of the elite one has to focus on specific technologies, and this awareness determines always the course of action of ZWEZ.

ZWEZ is run by the owners themselves. In comparison to many other companies, this provides the crucial advantage of having a long-term strategy paired with flexibility and promptness.



ZWEZ-Coat are specialized products and processes for the most important application areas of bonder sing: corrosion prevention with oil based products and paints, sliding improvement, minimization of abrasion, lubrication and separating functions of lubricants for cold forming.


ZWEZ-Black are specialized products and processes for decorative blackening and anticorrosive for all ferrous work pieces including stainless steel and cupreous work pieces as well as some zinc die casting alloys.

Inline pre- and post-treatment

ZWEZ-Clean/-Acid/-Oil are products for the complete optimized process of phosphating or blackening. These products are specifically designed for the demands of the processes and thus guarantee the highest possible quality standard.

ZWEZ-Clean /-Acid /-Oil

Degreasing, cleaning, decoating, derusting, descaling, pickling

The ZWEZ-products for pre- and post-treatment are specifically designed for the demands of the ZWEZ-Coat and ZWEZ-blackening processes and thus guarantee the highest possible quality standard for the coatings.

ZWEZ-Clean cleans and degreases with special effects, which are necessary for the coating and de-coating of formed parts. ZWEZ-Clean is distinguished by low application temperature and bath concentration, as well as by long bath life-time and suitability for micro-filtration.

ZWEZ-Acid removes oxidic impurities quickly and thoroughly while protecting the raw metal. This product range harmonizes well with the process chain of the ZWEZ-Coat or ZWEZ black coatings. Special ZWEZ-Acid-Additives for pickling, degreasing and inhibiting complement this range of products.

ZWEZ-Oil is a conservation system used as a final treatment. The coating is carried out in an aqueous solution (Emulsion; ZWEZ-Oil E) or in a solvent on petrol basis (ZWEZ-Oil D). Whether thick or thin, hard or soft, suitable for every demand and types of application. For removing these coatings, ZWEZ-Clean products are to be used, as these products are specifically designed for such applications.

Extra-specially formulated ZWEZ-Clean/ZWEZ-Acid-products are designed for residue-free removal of all kinds of lubricant types and carrier films. By means of their distinctive properties, they can cleanse formed parts, wires and pipes within shortest time. They thus guarantee a trouble-free processing.

The special processes for alkaline treatment such as ZWEZ-Clean: cleansing, degreasing, decoating and acidic treatment, such as ZWEZ-Acid: derusting, descaling, decoating, perfectly fulfill the very different cleansing tasks.

Special products for pre- and post-treatment optimize these processes:

  • ZWEZ-Clean ADD for microfiltration

  • ZWEZ-Acid – inhibitors for all mineral acids

  • ZWEZ-Acid – pickling degreaser

  • ZWEZ-Rinse for neutralizing and passivating post-treatment


Phosphating for corrosion protection of iron, steel and zinc

The phosphate coating is an unrivalled carrier of corrosion protection products such as oils, waxes or paints. These phosphate coatings are an extraordinarily good adhesion base and a perfect rust protection for such products.

ZWEZ-Coat optimises the protection value by particularly densely packed phosphate crystals and their perfect adhesion. The passivations specially designed for these applications support the effect of this corrosion protection
system. Compared to galvanic coatings, the phosphate rustprotection in its high quality is even generated in cavities. The homogeneous dark-grey colour of the ZWEZ-Coat coatings has a very decorative effect.

The ZWEZ-Coat processes adapt themselves substantially to any demand and any system. There are coating thicknesses from very thin to very thick and for all normal bath temperature ranges. A stable bath process as well as low sludge and crust generation are self-evident for ZWEZ-Coat.

Special products for pre and post treatment optimize these processes:

  • ZWEZ-Cond for the pre treatment of fine and thin coatings

  • ZWEZ-Rinse for the post treatment for neutralisation/passivation

  • ZWEZ-Oil E and ZWEZ-Oil D for subsequent rust-protection oiling 

Manganese phosphating for sliding improvement and rust protection

There are two decisive reasons for using a ZWEZ-Coat phosphating agent on amanganese basis instead of using zinc phosphating.

1. Significant properties for abrasion reduction, e.g. for screw fittings, as well as a significant improvement in the running-in results of sliding parts of machines or engines.

2. Rust protection with an especially dark – almost black – phosphate coating; considerably darker than zinc phosphating. With larger coating thicknesses,

e.g. 15 μm, the roughness of the surface is significantly lower than with zinc phosphate coatings. The post-treatment is carried out with rust-protection products on oil or wax basis or also with paints.

Basically, a manganese phosphating generates significantly different phosphate

crystals compared to a zinc phosphating. This effect is distinct in the ZWEZ-Coat
products, and it is stable under most difficult application conditions.

These ZWEZ-Coat products fulfil both typical application areas in the best possible way, with both thin and medium-sized or thick coatings. The immersion process, as well as the sludge and crust generation are being optimised.

One can select from varying application temperatures.

Special products for pre- and post-treatment optimize these processes:

  • ZWEZ-Cond for the activating pre-treatment, as prerequisite for a coating generation

  • ZWEZ-Rinse for the post treatment, for neutralization and passivation

  • ZWEZ-Oil E and ZWEZ-Oil D for subsequent rust-protection oiling

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