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:
- Hydraulic parts, for instance piston rods
- Components for the automotive industry
- Wear resistant seal surfaces
- Wear resistant sliding bearings