INDUSTRY NEWS HYDRAULICS
The in-house electroplating is one of the most modern plants in Europe and is ideally designed for the internal process steps during coating – this high degree of specialization would not be attainable via outsourcing.
systems, flange couplings, valves, and accessories. VOSS Fluid has longstanding expertise in the production of customized connecting parts, enabling it to implement this effectively in the development of system solutions and technical advice for its customers. The result: consistently high-quality components, a high level of corrosion protection, time- efficient assembly capability of the components, and hydraulic systems with long-term leak tightness.
“Surface” quality with technical depth
A central, qualitative condition is the coating of the tube connections. This is a prerequisite for permanent corrosion protection along with functionally stable and hence economic components: VOSS Fluid utilizes its in-house, sustainable zinc-nickel base coating VOSS coat for all tube couplings. These fulfill all specifications of the EU End-of-life Vehicles Directive, which has prohibited surfaces containing chromium VI since 2007. Together with independent
research institutes and universities (for example Aalen University of Applied Sciences), a corrosion protection has been developed that is around ten times better than conventional zinc coatings in comparison to the base coats. In contrast to purely zinc surfaces, zinc-nickel does not form any distinct white rust during corrosion, but instead only a slight gray haziness. The values are 50 times below the limit values stipulated in EU Regulation 1907/2006 for determination of the nickel release of products coming into direct and prolonged contact with the skin. When comparing the VOSS coat surface directly with a 2-Euro coin, this fell below the limit value by 2230 times. The surface is not only environmentally compatible due to the hard nickel content, but also more wear resistant against the mechanical loads to which hydraulic couplings are exposed during transport and assembly through to practical application.
VOSS coat consists of a zinc- nickel base coat, which is then passivated and finally sealed. These
three layers prevent corrosion of the base material and enhance the connecting components in a sustainable way. According to VDMA Standards Sheet 24576, the zinc-nickel surface attains the highest corrosion resistance class K5. This denotes the protective capacity of the surface, which exhibits resistance a minimum of 720 hours against red rust and at least 360 hours against white rust. Under laboratory conditions with non-assembled parts, corrosion resistance of more than 2000 hours was attained in the salt spray test according to DIN EN ISO 9227. In the practical test with random goods from current production, they did not reveal any base metal corrosion even after 1000 hours of handling and assembly. For optimum assembly torques, the friction coefficients are continually improved in development and production for cutting ring couplings: That means they are significantly lower than for other zinc-nickel coatings. Depending on the connecting component, a lubricant and partial
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inner coating are used, for example union nuts. Experienced application technicians support assembly- reliable production processes at the customer facility. These technicians accompany fitters and maintenance personnel – from selection of the system-compatible hydraulic coupling and training covering all aspects of leakage-free couplings through to regular assembly audits.
Competitive edge in know- how: In-house electroplating The company-internal electroplating forms the basis for the high-quality coating of tube connections. This plant corresponds to a high technological standard as well as the current environmental provisions for mixed residential areas. It is also one of the most modern plants in Europe and is ideally designed for the internal process steps during coating – this high degree of specialization would not be attainable via outsourcing. In contrast to normal coatings, the process is optimized in respect to component damage
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