A wide range of parts are used in the engine compartments of cars. This often results in the combination of different, sometimes high-tensile materials, such as aluminium, stainless steel, plastics and steel. The components fitted therefore need to withstand particularly high temperatures and satisfy a range of corrosion protection requirements.
Spring band clips | Fastening Elements | Stamped Parts |
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Spring band clips are used to secure hose connections. In addition to high corrosion protection with limited coat thickness, depending on use these must also display functional characteristics such as chemical resistance or adhesiveness. | Fasteners are used in various geometries and dimensions in the engine compartment to establish screwed connections. Coatings for bolts and nuts need to be as thin as possible and display excellent corrosion and fastening characteristics (co-efficients of friction) – in particular where different materials are paired. | The engine compartment contains numerous stamped parts, clips and springs made from steel and stainless steel. These components need to display good protection against contact corrosion whilst at the same time offering good sliding properties. |
Depending on component, DÖRKEN offers various solutions for optimal corrosion protection in the engine compartment: from the use of pure zinc flake systems to the combination of different base coats with an organic or inorganic topcoat. Our specially-developed systems enable a high degree of corrosion protection to be achieved with comparatively very thin coats. In the case of fasteners, secure fastening is therefore achieved against different backings, whilst also effectively avoiding contact corrosion. One particular advantage of zinc flake coating is that it does not cause application-related hydrogen-induced stress corrosion cracking - which is why zinc flake is in standard use for high-tensile components.
Another application example is electric drive motors, which are not only used in vehicles as part of electromobility, but also in modern combustion engines in order to realise fuel and CO2 savings. The centrepieces of the electric motor consist of a stator and rotor. They form the power-generating components of the motor and thus perform the mechanical work. The rotor is set in motion by the interaction with the magnetic field of the stator, which converts the desired energy. Similarly, kinetic energy can be converted back into electrical energy and thus returned. The components installed in the motor compartment with the external stators are exposed to heavy mechanical and electrical loads, which entails the risk of corrosion and wear.
DÖRKEN has succeeded in developing an innovative solution to protect these stators against corrosion. Application methods have been developed to apply the DELTA-PROTEKT® KL100 basecoat (inner and outer surfaces of the stator) and the DELTA-PROTEKT® VH301 GZ topcoat (outer surfaces only) to protect the stator from external influences such as moisture, salt and dirt. This coating prevents moisture from penetrating the rotor and damaging it, which ensures the long-term functionality and reliability of the motor.
By using this protective coating, DÖRKEN can not only extend the service life of electric motors, but also increase their energy efficiency. The improved protection against corrosion ensures that the motors work reliably even under extreme conditions and reduces maintenance costs. This represents a significant advance in the production of electric motors and shows how technical innovations can help to sustainably improve the performance and durability of industrial machinery.