Wind Blade Leading-Edge Coating in China

Illustration notice. Process illustrations are not verified photographs of this installation.

Project reference basis. Figures and configuration details are reported in the supplied project brief. They are reference values for the stated application, rather than verified acceptance results or a guarantee for another installation. Confirm the source records, material, tooling, operating schedule and test method when assessing a comparable project.

A leading offshore wind turbine blade manufacturer in China partnered with Haifeng to establish an automated leading-edge protection (LEP) coating cell. The project was commissioned to apply high-durability elastomeric coatings along the outer 35-meter tip sections of 102-meter hybrid carbon-glass blades for an 8MW offshore wind platform.

Operating at tip linear speeds exceeding 100 m/s in heavy maritime rain, existing gel-coat surfaces suffered from micro-cracking and pitting within 18 months of offshore deployment, deteriorating aerodynamic lift-to-drag ratios and causing annual power yield drops up to 4.2%. Legacy pneumatic spraying produced excessive orange-peel ripple defects and wide thickness deviations (ranging from 200 to 550 µm), failing standardized DNV whirling arm rain erosion qualifications.

Haifeng deployed an ultra-precision robotic spraying cell centered on the HF-WND80-SRV servo direct-drive machine. Featuring non-pulsing fluid metering (< ±0.1 MPa) and shaped air-curtain flat-fan atomization, the system delivered uniform dry film builds of 300 µm ± 20 µm. The cured polyaspartic coating survived 15 continuous hours of 120 m/s rain erosion testing without surface degradation.

The supplied project brief describes a robotic leading-edge coating station with blade supports, contour tracking, servo metering, inline heating and a gantry spray carriage. The stated material system is a polyaspartic resin with an aliphatic polyisocyanate. Pressure, flow, traverse speed and curing settings are project reference parameters requiring confirmation against the formulation and ambient conditions. The brief mentions a 300 µm film setting and a ±20 µm thickness range; wet-film application thickness and cured dry-film acceptance must be specified separately before these figures are used for equipment acceptance. Optical inspection coverage and calibration also require a defined project procedure.