Indestructible: STAUFF and VOSWINKEL components in agriculture

Superior resistance to aggressive substances

The use of components in agricultural machinery places high demands on the corrosion resistance of hydraulic line components, such as tube and hose connections and fasteners. They are not just exposed to usual weather and climate-related hazards, but frequently come into contact with particularly aggressive substances: with fertilizers containing phosphate or nitrogen, pesticides, cleaning concentrates, oils and other media. 

STAUFF, one of the leading manufacturers of line components and hydraulic accessories, based in Werdohl/Germany, has been using a zinc/nickel surface coating for steel components for over ten years, which offers extremely good protection against red rust or base metal corrosion, even compared to other manufacturers’ zinc/nickel coatings. A large proportion of the product range is produced as standard with the chromium VI-free zinc/nickel surface coating, also including the company’s own STAUFF Connect tube connectors range and VOSWINKEL hose connectors.

In-house test chamber for all hazardous substances

The coating offers over 1,200 hours of resistance to red rust / base metal corrosion under practical test conditions in the salt spray chamber in line with DIN EN ISO 9227. It therefore exceeds the most demanding requirements, as defined in the VDMA Standard Sheet 24576. However, there are no other general standards or cross-vendor regulations, for instance governing fertilizer resistance. According to Thomas Butzki, Head of the Test Laboratory in the STAUFF Technology Centre in Werdohl: “For us as a manufacturer of quality components, the salt spray chamber test is inadequate as the sole comparable criterion.” STAUFF and VOSWINKEL components with a zinc/nickel coating are exposed to aggressive media, such as hydraulic, lubrication and engine oils, fuels, coolants, brake fluids etc., in a test rig specifically developed to determine the resistance of materials and coatings.

“We also offer the manufacturers of agricultural machinery the opportunity to individually test our products with fertilizers, pesticides, cleaning concentrates and other media. The assessment of our zinc/nickel coating can be proved and its resistance objectively demonstrated by means of clearly defined and practical conditions and time periods accompanied by appropriate documentation,” concludes Thomas Butzki.

Surface protection beyond the market standards

With at least 720 hours resistance against red rust, the Zinc/Nickel coating offers excellent surface protection far beyond the previous market standards – even after transport, handling and assembly. This was successfully confirmed by testing in the salt-spray chamber according to DIN EN ISO 9227.

Users across all industries and applications benefit from sophisticated technology, which has been developed for and used by the very demanding automotive industry for many years now and that is already the proven standard for a large proportion of STAUFF and VOSWINKEL components since 2007.

Characteristics and features of the coating

  • At least 720 hours resistance to red rust / base metal corrosion under practical conditions
  • White rust occurs only by way of a slight grey haze
  • Surpassing the requirements of the corrosion protection class K5 as defined by the VDMA, the German Engineering Association (360 hours resistance to white rust / 720 hours resistance to red rust)
  • Free of hexavalent chrome Cr(VI)
  • ELV compliant according to 2000/53/EC (End of Life Vehicles Directive)
  • REACH compliant according to 1907/2006/EC (Registration, Evaluation, Authorisation and Restriction of Chemicals)
  • RoHS compliant according to 2002/95/EC (Restrictions of the Use of Hazardous Substances)
  • Appealing colour scheme with a bright semi-gloss surface finish – comparable to Stainless Steel
  • Significantly reduced tendency to corrosion by contact with other metals (such as Aluminium and Stainless Steel)
  • Improved abrasion resistance due to the ductility / plastic deformability of the coating
  • Little to no risk of triggering allergies – nickel release is down to only a fraction of the statutory limits relating to objects which come into direct and prolonged contact with the skin (independent results of the reference test method according DIN EN 1811 are available on request)
  • Good paint adhesion properties
  • Resistance against all commonly used hydraulic media

 

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The test department with its built-in extraction system enables tests to be carried out using the most diverse media, into which the components are immersed for a shorter or longer period of time

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Christmas

Layers

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STAUFF Cover Plate with Zinc/Nickel Coating

No signs of corrosion after 528 hours of testing in the salt-spray chamber according to DIN EN ISO 9227

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STAUFF Cover Plates with Alternative Coatings

Galvanisation and blue-chromating after 96 hours
ƒƒGalvanisation and yellow-chromating after 192 hours
Zinc-coating, thick-film passivation and sealing
after 192 hours

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