high-quality coating even with complex geometries

Betz-Chrom is the specialist for surfaces in plastics engineering. Decades of experience in in-house anode and fixture construction enable us to provide individual and precise coatings for geometrically complex extrusion and injection moulding screws for protection against corrosion and wear. Your machine downtimes will be shortened. Due to the anti-adhesive hard chrome property, the “sticking” or “caking” of plastic is avoided, so the cleaning process of the screws is less time-consuming. Furthermore, we offer the regeneration of screws.

Our know-how for protection against wear and corrosion

The following machine components of the plastics industry are hard chrome plated at Betz-Chrom: extrusion screws, mixing screws, Pet screws, nozzles, mandrels, casings, pipes, displacers, mandrel carriers, torpedoes, spiral mandrel distributors, screw heads and screw tips. Learn more about our hard chrome processes.

Furthermore, we coat screw barrels with the electroless nickel process. Get more information about electroless nickel plating here.

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Dimensions of your components for hard chrome plating

  • Vertical chrome plating: ⌀ 1300 x 4700 mm or 8000 mm with rotation of the workpiece
  • Horizontal chrome plating: ⌀ 60 x 6500 mm
  • Forms: 1700 x 1500 x 1300 mm
  • Weight: 5000 kg

Would you like a technical consultation? We look forward to your inquiry!


Hard Chromium plating of screws

The treatment steps in the chromium plating of screws

  1. Pickling
  2. Welding of damages
  3. Hard chromium plating
  4. Mechanical processing such as grinding and polishing

We also have the possibility of chrome-plating pre-nitrided screws. This requires a series of special pre-treatment steps to guarantee perfect adhesion of the chrome layer to the base material. The hardened base material in combination with the hard chrome layer will increase the service life many times over.

Regeneration processing of Screws

The regeneration of extrusion and injection moulding screws is a cost-effective and high-quality alternative to the new acquisition of workpieces. The precise production of the surfaces requested by you is accompanied, analyzed and documented by our quality team. For the repair of screws, we work together with carefully selected subcontractors, who take over the mechanical processing steps of the regeneration for us. We carry out the subsequent hard chrome plating, polishing of the screws and final quality control.

Our core processes

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Electroless nickel

For hardness, wear resistance and very high corrosion protection with even layer thickness distribution.

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Hard chrome

For corrosion protection, tribological properties and a particularly high wear resistance against mechanical stress.

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Precision grinding

For dimensional accuracy, roughness depth and bearing ratio depending on the requested surface quality.

Betz-Chrom – your partner for strong parts

In the sense of a trustful partnership, you will receive highly qualified technical advice from us that is tailored to your needs. We combine 70 years of experience in surface technology with an innovative and inquisitive corporate culture. Our quality awareness, our occupational health and safety management as well as our measures for environmental protection and energy saving are audited and certified according to DIN standards. As an on-schedule partner with high quality level, we constantly aim to find the optimal process solution for you.