TOPCOAT CCR

TOPCOAT CCR is a single-layer chromium carbide coating designed as a superior alternative to galvanic (nickel-)chromium. A key advantage is that no hexavalent chromium(Cr⁶⁺) is formed during production — an important consideration given the upcoming EU restrictions on Cr⁶⁺ processes.

CCR is tribologically equivalent to a (nickel-)chromium coating, making it suitable asa direct 1:1 replacement without requiring any modification to the cylinder head or sealing assembly. With typical coating thicknesses between 100 and200μm, TOPCOAT CCR is ideal for repairing or replacing hard-chrome plated rods. Surface roughness, sliding behaviour and lubrication characteristics are identical to traditional chrome coatings.

Corrosion resistance is significantly better than electrolytic (nickel-)chromium, particularly in sodium chloride, acidic and alkaline environments. CCR also shows strong resistance to oxidation at high temperatures. However, hydrochloric acid (HCl) must be avoided.

The coating offers extremely high wear resistance and hardness, resulting in minimal wear throughout the product’s lifetime while maintaining consistent tribological performance.

Further improve corrosion resistance

When additional corrosion protection is required, nickel-based superalloy intermediate layer TOPCOAT 177 can be applied beneath the coating — see TOPCOAT CCR+. If more extreme wear resistance or exposure to hydrochloric acid is expected, TOPCOAT WCR may be the better option.

Tailored smooth roughness between Ra 0,03 – 0,6μm  

Thanks to its high density (porosity < 0.7%), the coating can be finished very smoothly — evendown to Ra 0.03 μm. Griekspoor can tailor the roughness between Ra 0,03 μm and0,6 μm to match the optimal requirements of translational or rotational seals, ensuring maximum seal life, no leakage, no stick-slip and low friction.

Typical applications for TOPCOAT CCR

1. Hydraulic rods and plungers
2. Automotive components
3. Wear-resistant sealing surfaces
4. Sliding bearings
5. Engine valve spindles
6. Liners, bushes and ball valves.