TOPCOAT® WCR+ consists of a TOPCOAT® 177 UHCR intermediate coating, a nickel based superalloy, and a tungsten carbide top coating, namely TOPCOAT® WCR. As a result corrosion resistance and operational reliability are improved while maintaining the same wear resistance as WCR.

The WCR top coating is tribologically equivalent to an electrolytic (nickel-)chromium coating. So surface roughness, lubrication, sliding properties, etc. are equal to (nickel-)chromium. Moreover WCR+ is more resistant to corrosion than (nickel-)chromium, especially in sodium chloride, acidic, and alkaline environments.

The hardness of a tungsten coating may sometimes compromise the toughness of the coating as can be the case with TOPCOAT® WCR. However, even if the tungsten top coating is damaged by some form of impact, the underlaying TOPCOAT® 177 will protect the base material from corroding.


Typical applications for WCR+ are the same as for WCR but when improved corrosion resistance is required for:

  1. Hydraulic parts, for instance piston rods
  2. Plungers
  3. Components for the automotive industry
  4. Wear resistant seal surfaces
  5. Wear resistant sliding bearings

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Used technique

HVOF spraying

HVOF spraying

When HVOF (High Velocity Oxygen Fuel) spraying fuel and oxygen are ignited. The flow of gas expands through a special nozzle and reaches a speed of more than 1,500 m/s. The coating powder is injected axially in the gas flow reaching extremely high…


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