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A new approach is required for the definition of counter surfaces to ensure effective sealing in dynamic applications where chrome plating is replaced by alternative coatings.

Traditionally piston rods in hydraulic systems were chrome plated to provide friction and surface finish characteristics. Under the REACH directive, Hexavalent Chromium (CR6) is a substance of high concern and must now be omitted from any hydraulic application, leading to the adoption of alternative coatings for the hydraulic system’s piston rods.

To maximize the performance and system life in hydraulic systems, these should be designed to optimize a system’s tribology, which is dependent on the interaction of a system’s seals, hydraulic fluid and the finish of the mating surfaces.

The lubrication within the hydraulic system is fundamentally affected by the surface finish of the mating surfaces. Their characteristics will determine the lubrication within the system and therefore the tribological environment.

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