Generally, galvanic coatings are rather affordable and moderate up to sufficient corrosion resistant (nickel chromium). The scratch and wear resistance is reasonable to good, but cannot be compared with the ceramic coatings. Delaminating and limited ‘full’ salt water resistance or pore problems with nickel-chromium coatings on (high tensile) steel have been recorded. HVOF ceramic coatings are notable for their good anti-galling properties and high hardness. However, especially these ceramic coatings can show bond and brittleness problems,as well as increased seal-wear. In many cases, particularly the mono layers, inherent to the process, are not able to seal the surface entirely and, as a result, limit
the corrosion resistance. For these reasons there continued to be a need for coatings on hydraulics, without compromises. Lunac 2+ proved to be able to combine the desired properties as mentioned above and withstand harsh marine circumstances as yet unprecedented. If not used, the surface of Lunac 2+ can slightly tarnish. To acquire the highest corrosion resistance, the basic material needs to be ground accurately.

Recently we launched the new Lunac 2+ duplo system which is able to withstand the ecp-2 corrosion test and pass the 1000 hours ASTMB117 salt spray test (this moment even > 2500 hours without any rust spot).

Most important advantages of Lunac 2+ coatings:

- Very high resistance against adhesive wear and fretting. Lunac 2+ shows an effective hardness of Hv 2200, because of its transceramic nature. The material reacts to wear as if it is composed of sintered technical ceramics (wear resistance increase compared to hardened steel DIN 1,2379 HRc 68 under an adhesive load at 1.6 KPa, 0.7 m/s against 1,2379: 17 times).
- Excellent abrasive wear resistance. Lunac 2+ is very resistant against scratches induced by (quartz) sand.
- Totally closed structure. A typical increased ‘seal on ceramic’ wear is not
present and seals cause no 'course tracks' up to a pressure far above 1000 bar. We recommend applying harder seals such as      polyurethane seals Shore-A 95.
- Relatively low cost (comparable with chromium/nickel coatings).
- The bond with the substrate (steel up to HRc 50) exists from a continuing metal lattice, and is as a result, of welding quality. Even serious bending will not detach the coating (however cracks will show up if the coating is elongated over 0.28%).

- The Lunac 2+ coating is highly saltwater-resistant and protects the (steel) substrate durably if the surface does not show serious local failures/ pores at the time of the treatment. The surface must be ground (not rolled) to a roughness of Ra < 0.2 :m (0.0079 mil)/ Rz < 2 μm (0.079 mil).
- Reduced coefficient of friction with respect to stainless steel under water (as low as 0.009!). You can recognize Lunac 2+ treated parts by the particular high hardness and thoughness. The cutting edge of an HSS
drill is not able to scratch the surface.