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Agricultural

Equipment, machines and buildings used in the agricultural sector are subjected to different stresses – and this also applies for the construction parts and components that they contain. For example, machine components must be able to withstand constant environmental influences, retain long-term functional ability and also keep their original appearance. As a consequence, consistently effective corrosion protection is essential. In addition, resistance to mechanical stress must also be taken into account. Components in silos and livestock pens are also required to withstand chemical attack – such as cleaning agents or ammonia.

Your contact
Tobias Schmitz
Tel: +49 2330 9134056
Contact
Your contact
Tobias Schmitz
Tel: +49 2330 9134056
Contact

Application segments

Resistance against chemical attack

Agricultural machines and equipment contain countless fasteners and construction parts, which require an enduring coating as protection against corrosive elements. In addition to ensuring long-term function, retaining the optical appearance of the expensive capital goods also plays a significant role. As many components are subjected to daily attacks from fertiliser, pesticides and liquid manure as well as contact with silage, in many cases the coating system chosen must also provide a high degree of chemical resistance. Finally, options for colour also need to be taken into consideration.

Requirements

  • Corrosion resistance 480h (e.g. ISO 9227)
  • Colouring silver or black
  • Resistance to abrasion
  • Coefficients of friction
  • Resistance to chemicals
  • Compability to micro-encapsulation
  • Resistance to fertilizers
  • Resistance to stone chip

Solutions

As an alternative to powder coating, KTL coating and hot-dip galvanisation of steel components to protect against corrosion Dörken MKS offers zinc flake technology incorporating chromium(VI)-free surface protection with a long-term effect. The system consists of a zinc flake base coat and a special top coat and guarantees very good cathodic corrosion resistance with very thin coat thicknesses, thus helping to prevent the premature deterioration of components, extend the lifetime of machines and retain value. At the same time, the zinc flake coating offers a high degree of chemical resistance and is therefore able – as a replacement for stainless steel – to be used for the coating of components that are subject to the constant effects of fertiliser.

Example components

Fasteners

In addition to a high degree of corrosion protection, the surface coating of fasteners must also possess functional properties such as good fastening properties and high chemical resistance. The chromium(VI)-free zinc flake coating represents an alternative to stainless steel bolts here.

Springs

Springs used in agricultural machinery and equipment need to satisfy high corrosion protection requirements of 480-1440 hours as per the salt spray test. In addition, the typically high-tensile components need to be protected against sudden failure as a consequence of hydrogen-induced stress corrosion cracking.

Hydraulic components

Components utilised in machine or equipment hydraulics require effective protection against corrosive damage. Galvanic surface coatings from Dörken MKS are an option for this. These are free from chromium(VI), cobalt and nickel and ensure high-performance corrosion protection (720 hours as per salt spray test). At the same time, they also display a high level of resistance to fertiliser and other chemical substances.

Increasing the lifetime of the construction

From fasteners to steps and ladders and on to steel construction in the framework: parts and components of silos are exposed to the constant influence of wind and weather. In addition, the steel frames in particular often need to support high loads, depending on the capacity of the silo. To ensure the long-term functionality and stability of the overall construction the steel components require coating with an effective, active corrosion protection. At the same time, functional characteristics such as resistance to chemical attack and fertiliser need to be considered in the choice of surface coating.

Requirements

  • Corrosion resistance C5 (e.g. ISO 12944)
  • Resistance to chemicals
  • Food-safe
  • Coefficients of friction

Solutions

For long-lasting active corrosion protection for silo components Dörken MKS offers zinc flake technology approved by the Deutsches Institut für Bautechnik (DIBt). This has specification listings with numerous agricultural equipment manufacturers and consists of a zinc flake base coat and a top coat. Even with a very thin coat thickness (8 -12 µm) the system guarantees high-performance corrosion protection, preventing the seizing up of fasteners, for example. As no hydrogen is involved in the application process, process-related hydrogen brittling can be avoided, along with the subsequent premature loss of high-tensile steel components. In this way the zinc flake coating helps to extend the lifetime of the silo and retain value.

Example components

Fasteners

The many different nuts and bolts employed need to be given effective protection against rust (480-1440 hours as per salt spray test) and have good fastening characteristics (trueness) for ease of assembly. The chromium(VI)-free zinc flake coating of steel parts represents an alternative to stainless steel bolts here.

Steps

The ladders or steps fitted to silos need to fulfil very high requirements with regard to corrosion protection. It is also important that material deformation is avoided in application of the coating – the low annealing temperatures give zinc flake technology an advantage over hot-dip galvanisation in this respect.

Steel constructions in the frame

As frame constructions need to support heavy loads, securing long-term and reliable functional ability is especially important. Coating with the zinc flake technology approved by the DIBt avoids the risk of hydrogen-induced stress corrosion cracking.

Food-safe surface coating

Constructions used to house livestock are subject to environmental stresses such as rain and wind. To ensure functionality and appearance and achieve maximum longevity the components therefore require permanent protection against corrosive influences. At the same time, parts and components utilised in stables are subjected to numerous chemical attacks – for example due to repeated cleaning cycles or ammonia in livestock areas. Food-safe properties are also important when selecting surface coatings for livestock environments.

Requirements

  • Corrosion resistance C5 (e.g. ISO 12944)
  • Resistance to chemicals
  • Food-safe
  • Colouring

Solutions

The Dörken MKS zinc flake technology approved by the DIBt is suitable for coating fasteners and steel constructions in stables and livestock pens. Comprising a base coat and a special top coat, the system features very thin coats offering long-lasting cathodic corrosion protection and also boasts functional characteristics such as resistance to aggressive cleaning agents or fertilisers. This enables the functional capability and lifetime of the components to be extended. Further advantages of Dörken zinc flake technology: it is certified food safe and can therefore be used in stables and livestock pens, as it is harmless for animals. Finally, the zinc flake coating also enables the long-term retention of the appearance of the components.

Example components

Stable fixtures

Stables and livestock pens are fitted with various fixtures – such as profiles. These need to ensure very high corrosion protection and also be resistant to cleaning agents or manure. In addition, constant contact with animals means that the coating system must also be food-safe.

Fasteners

In addition to the requirements of corrosion protection (480-1440 hours as per salt spray test) the fasteners used in stables and livestock pens need to have good fastening capabilities and high resistance to manure for long-term functionality. The chromium(VI)-free zinc flake coating represents an alternative to stainless steel solutions here.

Ventilators

Ventilators are fitted to stables and livestock pens to provide air supply, with seams and blades typically produced from stainless steel. An alternative is coating the high-tensile steel components with zinc flake technology. This is applied without hydrogen brittling and offers long-lasting corrosion protection as well as good resistance to manure and cleaning agents.

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