OXIGARD - - C5-M-certified coating process for off-shore applications

Oxigard is a surface coating for C5-M off-shore applications tested and certified under real working conditions. The coating process produces highly resistant surfaces for usage under corrosive maritime conditions and is notably more resistant against mechanical strains than currently used surfaces. These products were developed with a particular focus on dimensionally stable components such as fastening elements in nacelles. Additionally, coatings of high-strength materials (FK 10 and FK 10.9) are possible without any final tempering process. This is a functional and economic innovation for off-shore applications.



OXIGARD surfaces were developed under real working conditions

On Helgoland, WHW Hillebrand and WKLM had used several test specimens with different corrosion protection surfaces in dive and spray areas on the open sea for two years. Helgoland houses one of only two off-shore corrosion test benches for the material auditing agency (Materialprüfungsanstalt, MPA) in Stuttgart. Among the test surfaces was the OXIGARD system, which had been developed for just this application.

After a testing duration of 24 months, the specimens were retrieved under the supervision of Germanischer Lloyd and the MPA to assess, document and judge exact corrosion damages and other important physical attributes such as the breakaway torque of individual systems.

You can view the results of both institutes in a downloadable PDF below.



Results of the two-year trial under C5-M conditions at the Helgoland test bench

Quote: For maritime environments, experience shows that evaluation degrees equal to or greater than 7 are acceptable. The Oxigard system is ready for use in atmospheric off-shore areas from a corrosion-technical point of view. It only shows isolated and small damages to the basis material following the test period. By and large, the system’s coating thickness is within the nominal stratum thickness following the test period.
(source:: MPA, Stuttgart)



Trial run certified and confirmed in accordance with corrosiveness category C5-M

in accordance with EN ISO 12944 part 2 through Germanischer Lloyd. Confirmation number GL-CON 1015 HH.



What is special about the OXIGARD coating process?

Off-shore wind turbines are subject to adverse environmental conditions by virtue of their usage. This makes both their installation and maintenance very challenging and costly. They needed a surface that guarantees impressive corrosion protection while offering many advantageous functional attributes as well.

Due to these high demands regarding the functionality of the surface, we tried to make any additional work following the initial installation superfluous. These costly after-installation tasks on the high sea include rethreading the female thread to correct too high or uneven coating thicknesses, or the difficult and destructive removal of connecting elements after the emergence of corrosion problems. Essentially, all processes that lower corrosion protection and functionality by damaging the coating system had to be stopped entirely.

The OXIGARD surface has completed an audited coating process several times and can be immediately assembled due to its high performance modulated upon delivery. No further work will have to be done once it’s installed.

OXIGARD - special attributes and functions

  • OXIGARD offers a very high corrosion protection (C5-M-certified)
  • The coating system has a high dimensional accuracy thanks to its thin layers and contour uniformity
  • OXIGARD possesses constant loosening torque for extreme corrosion (see certificate GL-CON 1016HH)
  • OXIGARD verfügt bei extremer Korrosion über konstante Lösemomente (siehe Zertifikat GL-CON 1016HH)
  • Defined friction coefficients are adjusted at the factory
  • Its looks are silver and its surface feel is metallic



OXIGARD - technical profile

Surface semi-matt
Hardness >400 HV0,05
Melting temperature >700°C
Friction coefficients without adjustment (adjustable within standardized friction value range) ca. 0,34
Paintability very good
Coat thickness distribution good
Corrosion resistance as per DIN EN ISO 9227 >720 h RR
Affinity for hydrogen embrittlement after applying the STRONGARD coating process none
Hydrogen permeation possible
Al contact corrosion low
thermal resistance very good
Volume of the corrosion products low