Lunac 2+ Verschleissschutz Deutschdiagram

Lunac 2+, offering full substrate bond and one of the toughest hard coatings currently available

  • Partly ceramic (Hv 1150/2100), relatively thick coating combining high wear, galling, seizing, impact and (sub surface) corrosion resistance

  • Mixed very dense alloy / metallic glass / ceramic system.

  • Main application: almost any sliding element, e.g. hydraulic pistons and axles

Lunac 2+ coated parts almost never return
for repair or revision

Four main Lunac 2+ version are available:

  • Lunac 2+: wear, anti galling and cost optimised.
    Usually 55-70µm (2.2-2.8 mil). In special cases
    up to 250 µm (9.8 mil).

  • Lunac 2(hc)+ duplex: ultimate corrosion protection
    capability, even after small accidents! Protects
    parts long lasting from corrosion without any oil
    film 120 µm (4.7 mil). EPQ qualified

  • Lunac 2hc+: best chemical resistance.
    Additional layer. See:

  • Lunac 2rc: best wear resistance.
    See: wear resistance


    wear resistant rail
    The new Panama canal

    Lunac 2+ has been applied to the door rail systems since 4 years to prevent the system from galling during filling of the lock and corrosion as well as to reduce and stabilise the coefficient of friction. Max. pressure: 560MPa. With permission of:



Dubai wheel bearings and storm lock systems are coated with Lunac 2+ because the Lunac 2+ coating offers a reliable bond, ultimate wear resistance and good corrosion protection. Lunac 2+ will wear out 300 times less than the composite bearing

Dubai wheel



Main characteristics Lunac 2+ (duplex):

  1. This hard crack free coating is highly resistant to adhesive and abrasive wear (adhesive wear test results: 23 N at 0.7 m/s; the combination Lunac 2+/Lunac 2+ is 19 times more wear resistant than the combination of hardened (HRc 64-66) DIN 1.2379 on hardened DIN 1.2379. Wear resistance in most composite plastic bearing systems k= 0.04 E-9 mm2/N (composite plastic in this system: k=12 E-9 mm2/N).
  2. Virtually immune to galling / fretting / cold welding or seizing problems in non-lubricated conditions.
    Therefore this coating is ideal for heavily loaded and non-lubricated parts in relative motion.
  3. Lunac 2+ duplex has proved to be one of the most reliable corrosion protection systems in (sea)water.
  4. Often, wear of the non-coated opposing part is also significantly reduced, especially in sea water.
  5. The coefficient of friction is +/- 25% less compared to hardened steel DIN 1.2379 / 1.2379.
  6. Steel cylinders and rods coated with Lunac 2+ are practically equal to HVOF
    ceramic plated cylinders with respect to wear
    , but are cheaper, much
    less vulnerable and prevent high seal wear.
  7. Able to deal with (shear) loads over 400 MPa with specified bearings.
  8. Although moisture can tarnish the Lunac 2+ surface,
    Lunac 2+ coatings will not change its features.
  9. Lunac 2+ highly resists oxidative wear (tribo wear).
  10. Complies fully with the RoHS standard.
  11. Relatively ductile (elongation 0.28%).

Ampelmann motion compensated gangways cylinders such as the arctic 'iceman' have been Lunac 2+ duplex coated to withstand the highly corrosive offshore (arctic) conditions. Lunac 2+ duplex eradicated any corrosion or wear issue. The good thermal conductivity of the semi-ceramic Lunac 2+ coating (combined with high tensile carbon steel) also reduces the seal temperatures which is important in the case of high velocity (wave compensation) systems.

screen changer ceramic coating

Thick complex Lunac 2+ coatings (80 µm / 3 mil) applied to screen changer piston and bores, offer one of the most successful tough ceramic-like, corrosion resistant alloy combination and are able to handle high mechanical loads and shearing without cracking or blistering.

Lunac 2+ duplex coated carbon steel parts in marine environment offer :

- (galvanic and sub-surface) corrosion prevention due to the very dense, corrosion resistant structure with cathodic protective power and consequently resistance to corrosion after impact (see figure 5 !)
- limitation or eradication of stainless steel and facilitating selection of high tensile steel
- 4-fold improvement of heat conductivity and capability to select hard composite plastics.
- ultimate scratch and abrasive (sand) wear resistance
- mostly highly profitable

ceramic bearing

Julianasluis Lunac 2+ duplex coated main bearing


Ketelbrug. Internally coated Lunac 2+ disk spring guidance to prevent the spring disks from galling and jamming.







rotor disk ceramic coatingvane pump wear prevention



Stainless steel Rotor disk frontal face (above) or pump vanes and housing have been coated with Lunac 2+ to prevent wear, fretting and galling applied. The goal is hard metal replacement and chemical resistance. Lunac 2+ applied to a single moving element can already highly prevent the total system from galling. The service time of this concept vane pump dramatically increased. Picture and revision of vane pump: TDO technical services.





off shore piston rods

Hydraulic crane piston rods coated with 120 µm (5 mil) Lunac 2+ duplex. These Lunac 2+ duplex coatings are particularly resistant to (sub surface) corrosion, scratches and high abrasive wear load. The new WMV 3900 mm plating line is able to handle parts up to 3000 kg (6667 Lbs). In 2017 the track record of Lunac 2+ duplex plated piston rods since the introduction in 2011 is 0.0005 return due to a crevice corrosion defect. Spontaneous corrosion has still never been claimed yet !

Corrosion resistance after damage

Lunac 2+ duplex coated parts can very well deal with impacts and damage.
Lunac 2+ duplex will prevent the carbon steel parts from sub-surface corrosion in a unique way

corrosion resistance after damage

Test: 4 mild steel test rods with hard corrosion protection coatings after 1250 hours neutral salt spray testing:

1- Double layer chromium mostly offers moderately up to good corrosion protection after 1000 hours NSS testing, but
cannot preserve corrosion resistance after a 0.08 mm / 3 mil plastic deformation has taken place. Chloride resistance is poor.
2- Nickel-chromium coatings frequently show some small rust spots after 1000 hours NSS testing, but do not
develop additional rust spots after a 0.08 mm / 3 mil plastic deformation has taken place. Chloride resistance is poor.
3- Lunac 2+ duplex can fully resist 2500 hours NSS testing and can deal with 0.08 mm / 3 mil plastic deformation.
Chloride resistance is good.
4- Most HVOF ceramic duplex coatings (picture right) can fully resist 1000 hours NSS testing, but cannot deal with
almost any plastic deformation (progressive blistering). Chloride resistance is mostly acceptable up to good.


Details of the Lunac 2+ (duplex) coating system:


- the throwing power in complex / deep structures is approximately 6 times better than that of hard chromium (resulting in less edge build up).

- Lunac 2+ duplex passes the ASTM B117 1000 hours NSS (Neutral Salt Spray) test (2500 hours proven) without any rust formation when applied to micro-defect free construction steel such as S355J2.

-Lunac 2+ duplex has since the 26th of September 2011 been qualified to offer long lasting corrosion protection. This test is based on the EPQ test (ECP accelerated corrosion test) as described in ASTM G59-97 (2003) and ASTM G61-86 (2003)
. Lunac 2+ duplex NBD10300 (Rijkswaterstaat) qualification English

Independent corrosion testing performed by
C-Cube, Delft.

Lunac coatings can be applied to:

- almost every kind of (stainless)
steel or cast iron (up to HRc 50)
- nearly all copper alloys

High mechanical load applications

Lunac 2+ (duplex) proved to be one of the most reliable and profitable coating systems to obtain long lasting wear, scratch and corrosion resistance. Lunac 2+ coated hydraulic cylinders and bearings in heavy lifting equipment are categorised as proven technology to withstand high shear loads and harsh outdoor conditions for a very long period (according to feed back, since 1995, no Lunac 2+ plated hydraulic cylinders is ever decommisioned due to spontaneous coating issues).

Basic elements :

  • little seal and guide-band wear due to smooth surface
  • no rust formation (and no sub surface corrosion)
  • ceramic coating for hydraulic cylindersultimate scratch resistance and no oil leakage
  • accidents do not initiate a peeling process,
    but are limited to localized deformations
  • able to deal with more than 400 MPa load

heavy lifting hydraulic cylinders coated with Lunac 2+

mammoet crane equipped with Lunac 2+

Enerpac and Mammoet cranes equipped
with Lunac 2+ coated hydraulic cylinders
and bearings.

sea water resistant bearings

The main bearing axles in the doors of the Kornwerderzand lock of the major northern Dutch IJsselmeer dam have been Lunac 2+ coated because of the corrosion resistance, exceptional abrasive (sand) wear resistance and shock resistance (waves) of the coating. Moreover the Lunac 2+ coefficient of friction in water contact conditions can be exceptionally low.

Main Ø 280 mm submerged axles of the new buoy system in Rotterdam habour are Lunac 2 + duplex plated to resist corrosion and especially high wear loads (sand, sludge and continuous swing loads caused by the moored vessels at 3057 KN / 12 MPa bearing load).

First inspection of main Lunac 2+ coated Ø 280 mm axle. Not any corrosion or wear has been
recorded despite the brackish water and sludge/sandy condition at the bottom of the harbour.

Due to the non-stick characteristic of the Lunac 2+ surface the locally present sludge deposit can be removed
completely and with much less effort. The applied steel plate cannot damage the 135 ┬Ám / HRc 72 coating.