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Thursday, 19 September 2019
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Raw materials & technologies, Applications, Protective & Marine coatings

Coating withstands harsh conditions in the offshore sector

Monday, 18 August 2014

A zinc flake system has been specifically designed for marine and offshore environments.

Fasteners coated with the system capable to resist in offshore atmosphere.

Source: NOF

Fasteners coated with the system capable to resist in offshore atmosphere.

Source: NOF

 "Geomet 321” has been used by Siemens Wind Power on fasteners of wind turbine blades. For this application, the producer 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 hours salt spray test. For this reason, the system is being applied with a thickness of 15 microns. At the same time, General Electric Power & Water(division in charge of the construction of wind power plants) has approved the zinc flake system in its latest standard P14A-AL-0218. Specific requirements such as 1,000 hours salt spray resistance (according to ASTM-B117 or ISO-9227) could be met and mechanical damage tests were convincing.

2,016 hours without appearance of red rust

In addition to these new standards, the system has 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 of 1,440 up to 2,016 hours without appearance of red rust. Aside from the recent certificates, the French Corrosion Institute had already certified the technology in 2010 and proved their ability to pass the ISO Norm 20340 standard (performance requirements regarding coating systems for  the protection of offshore plants and associated facilities), which corresponds to level C5-M (according to ISO-12944). It has to be mentioned that the tests, according to the ISO-20340 standard, include 25 cycles of one week each, with three days of UV exposure with condensation, three days of salt spray tests and one day of low temperature exposure (-20°C).

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