Standards and certification for wind turbine protective coatings

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At present, there are no **standards** for corrosion protection in wind turbines; the requirements regarding corrosion protection are mainly based on those specified in the relevant **standards** for wind turbine units. Abroad, there are unified standard specifications for wind turbine protection, with regulations covering all aspects of corrosion prevention technology. 　　 　　**A leading group for the development of wind power standards in the energy sector, an expert advisory group, and a standardization technical committee have already been established. A wind power standard system is set to be created, comprising 6 major categories of standards: wind farm planning and design, wind farm construction and installation, wind farm operation and maintenance management, wind farm grid connection management technologies, wind power mechanical equipment, and wind power electrical equipment. Regulations regarding the coating protection standards for wind power equipment are likely to be established. 　　 　　The \"Code for Offshore Wind Turbines\" formulated by the China Classification Society has undergone review meetings and was approved. The ‘Specifications for Offshore Wind Turbines’ set out technical requirements for the corrosion protection of the steel structures, mechanical components, and electrical components of offshore wind turbines, as well as for the inner and outer surfaces of concrete foundations, and also for the outer surface of wind turbine blades. 　　 　　The **main standards for wind turbine generators include the following, some of which relate to coatings: Safety requirements for wind turbine generators (GB18451.1-2001)/**Standards of the People’s Republic of China ； 　　 　　Acceptance Specifications for Wind Turbine Generators (GB/T 20319-2006)/Standard of the People’s Republic of China** ； 　　 　　Wind turbine tower (GB/T19072-2003)/Standard of the People’s Republic of China** ； 　　 　　JB/T10194-2000 Industry standard for wind turbine blades/machinery. The selection of corrosion-resistant coatings for the steel structures in wind farms is based primarily on three standards: 1) ISO 12944 – Paints and varnishes – Corrosion protection of protective coating systems for steel structures (1998). ISO 12944 is an important standard for corrosion-resistant coating systems designed for steel structures in various corrosive environments, especially those exposed to atmospheric corrosion. 　　 　　2) NORSOK M501 Surface Treatment and Protective Coatings (Revised 4th Edition, 2004): NORSOK M501 is an important standard for anti-corrosion coatings and painting on offshore oil platforms in the Nordic region; it therefore also serves as an important reference standard for the protection of steel structures in offshore wind farms. 　　 　　3) ISO 20340 – Paints and varnishes – Performance requirements for protective coating systems for offshore works and related structures (2003): ISO 20340 establishes the minimum performance requirements for anti-corrosion coatings used on offshore steel structures; it serves as an important supplementary standard to ISO 12944 regarding anti-corrosion coatings for such structures. Therefore, ISO20340 is also an important reference standard for steel structure coating systems in offshore wind farms. 　　 　　At present, the most authoritative certification for wind turbine coatings is the GL certification from Germanischer Lloyd. It has a complete set of standards for wind turbine systems, which includes standards for wind turbine coatings. Several major foreign wind turbine coating manufacturers, such as Mankiewicz, Bergolin, Maga, PPG, etc., have obtained GL certification. 　　 　　The main test items and standards for GL certification include: viscosity (ISO2284), density (ISO2881), non-volatile matter content (ISO3251), hardness (ISO1519), bending resistance (ISO9352), wear resistance (ISO7784), aging resistance (ISO11341), and adhesion testing (ISO4624). The adhesion test was conducted under two conditions: a. fiberglass samples, 24 hours; b. steel plates: salt spray for 480 hours, water curing for 720 hours.