WEBER-HYDRAULIK has developed a new piston rod coating especially for hydraulic cylinders, which are used in particularly harsh environmental conditions. Besides having very convincing functional properties, it is also economically attractive.

Hydraulic cylinders in vehicles have to constantly deal with corrosive attacks. This is particularly true for applications where the particular installation of the cylinder exposed it to very strong environmental media. As an example of this one could mention the steering cylinders of mobile cranes and commercial vehicles.

Therefore, expensive technical measures have to be consequently adopted in these particular applications, in order to minimise the corrosive impact and to achieve a long service life. The piston rod of the hydraulic cylinder is of central importance in this context.

That is exactly the reason why WEBER-HYDRAULIK has developed the WNC coating. The objective of this development was to create a cost-effective solution that meets the highest requirements. This means: corrosion protection, adherence of the layer on the base material and resistance to wear and tear.

This was achieved with a novel coating which WEBER-HYDRAULIK patented. The base material of the piston rod is coated with a first layer of a nickel alloy. Then a layer of hard chrome is applied on top of it. Despite the much higher corrosion protection, the total resulting thickness of the two layers put together is less than with ordinary hard chrome layers, which leads to a shorter coating time. The top layer of hard chrome has the advantage that the tribological properties of this new coating do not differ from those of conventional hard chrome coatings. The same high level of hardness is also achieved. The coating of the piston rods with the new process is carried out in the electroplating plant of the WEBER-HYDRAULIK factory in Güglingen. This has logistical benefits and results in short lead times. This also has additional benefits on the adhesion properties as there are no storage periods before the coating is applied. Thus, the occurrence of oxidation on the surface is avoided without conservation processes.



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