The ultimate trans-ceramic coating concept
for hydraulic cylinders and axles
14 years ago the new trans ceramic Lunac 2+ coating was expected to be able to finally combine all desired features needed for a compromise free hydraulic coating. Currently, the combination of; very hard/scratch resistant, attractively priced, seal-sparing, corrosion resistant, ductile and fully bonded coating, is still very hard to obtain simultaneously with common coatings. Apart from a tarnish effect after a longer period of non use, nowadays Lunac 2+ can actually be judged as the first coating with no serious practical limitations in hydraulic applications! In 2009 various appliers simultaneously declared Lunac 2+ in combination with ductile nickel as being the most proven and suitable material in especially their offshore and heavy lifting applications for widespread use. Some of the earliest Lunac 2+ appliers report 12 years of zero drop out rate.
The duplo coating concept on construction steel (with intermediate technical nickel layer) passes the ASTM B117 1000 hours Neutral Salt Spray test with no rust spot formation (rating 10).
The corrosion resistance of the very hard (Hv eff. 2300 ) Lunac 2+ coating is particularly so long lasting because unique compressive stresses keep Lunac 2+ coatings micro crack free. The, for these types of hard coatings, unusually high degree of bonding with the substrate, makes Lunac 2+ suitable for a rough environment (loose chippings, punch). The resistance against spontaneous or by pollution induced scratches is remarkable. Seals (and even the hard epoxy seals) barely interact with Lunac 2+ . Because of this, another important application for Lunac 2+ is on the axles of (slurry) pumps! The Lunac 2+ process can be executed effectively for these types of machine parts. Consequently the costing equals the costing of conventional chromium-nickel coatings! Lunac 2+ coatings are finished with a roughness of Ra = 0,12-0,3 µm (0.0047-0.0118") and do not need any post treatment. See the special report on the application of Lunac 2+ on hydraulic systems.
These 3000 mm / 118" hydraulic Lunac 2+ plated pistons change the way hydraulic plating up to 4000 mm / 157.48" can be assessed because of a unique combination of features. This corrosion resistant, very hard, refractory and pore free material establishes a full substrate bond like a welded material and equalizes technical ceramics in tribological perspective. Full technical ceramic coatings will hardly ever deliver absolutely pore free coatings without intermediate coatings and will always stay vulnerable. See the following picture displaying the Lunac 2+ surface after 7 years outdoor application!
Dredging pump axle (Ø 350 mm) coated with 250 µm Lunac 2+. The HT-HNBR seal lifetime is significantly prolonged because of the smooth Lunac 2+ surface and low friction-coefficient .
Lock door axles (Amerongen) coated with Lunac 2+, operational in the water-air interface after 9 years. This corrosion system does not inflict any extra damage to the Lunac 2+ coating.