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   date =>protectedDateTimeprototypeobject (2019-08-20T02:00:00+02:00, 1566259200)content =>protected'<p><strong>High-performance corrosion protection for screwed fasteners in hi
      gh-tensile steel enables wind energy units to be largely maintenance free. Z
      inc flake systems have proven their reliability in the area of rotor blade f
      astenings for over 30 years.</strong></p> <p>The rotor blades are fundament
      al, key components of a wind energy unit. They are used to extract energy fr
      om flows of air and move this to the generator. The blade lengths of up to 8
      5 metres and a weight of up to 25 tonnes mean that the fastening of the roto
      r blades to the rotor hub is particularly significant. This is achieved usin
      g fasteners, consisting of so-called double ends, barrel-nuts and hexagonal
      nuts, typically in the M30 to M36 dimension range.</p> <p><strong>Diverse s
      tresses and requirements</strong></p> <p>The rotor blades and thereby also
      their screwed fasteners are subjected to extreme climatic as well as dynamic
       stress from wind load and the operation of the unit itself. This is joined
      by static forces from prestressing of the bolts and the mass of the connecte
      d elements. As a consequence of the high level of stress for the screwed fas
      teners, the choice of corrosion protection is especially important. The prot
      ective coating needs to meet specified coefficients of friction in order to
      guarantee problem-free fastening on the construction site, typically with co
      nsiderable time pressure and under difficult conditions. In addition, the co
      ating must offer highly-effective and long-lasting corrosion protection to e
      nsure the long-term, reliable operation of the unit.</p> <p><img alt="" dat
      a-htmlarea-file-table="sys_file" data-htmlarea-file-uid="3308" data-htmlarea
      -zoom="true" height="200" src="fileadmin/_processed_/6/b/csm_Studboltset009_
      b8983fbc62.jpg" width="300" style="" /><br /> <em>Rotor blade fastener compr
      ising double end, barrel nuts, hexagonal nuts and washers.</em></p> <p><str
      ong>Corrosion protection with multiple benefits</strong></p> <p>The extreme
      ly thin zinc flake coati...
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