Since the end of 2013, GEOMET 321 has been used by Siemens Wind Power A/S on fasteners of wind turbine blades. For this application, Siemens Wind Power A/S requires that the coating must be able to exist in a C5-H environment (according to ISO-12944) without corrosion of the substrate material even after a 1,440-hour salt spray test. For this reason, GEOMET 321 is being applied with a thickness of 15 microns.
At the same time, GE Power & Water has approved the zinc flake systems GEOMET and GEOBLACK in its latest standard P14A-AL-0218. Specific requirements such as 1000-hour salt spray resistance (according to ASTM-B117 or ISO-9227) could be met, and mechanical damage tests were convincing.
In addition to these new standards, the systems GEOMET 321 PLUS VLh and GEOMET 500 PLUS XL have been certified by the institute Germanischer Lloyd regarding the corrosion protection of fasteners in oceanic and offshore atmosphere with high salinity levels (C5-M high according to ISO-12944). This means a salt spray resistance from 1,440 to 2,016 hours without appearance of red rust.
NOF Metal Coatings Group is the first to have been certified by two different institutes, which confirms its potential of low thickness corrosion protection for offshore installations.
Aside from the recent certificates by Germanischer Lloyd, the French Corrosion Institute had already certified the technologies GEOMET and DACROMET in 2010 and proved their ability to pass the ISO Norm 20340 standard, which corresponds to level C5-M.
NOF Metal Coatings Group
Filed Under: News, Offshore wind