Aluminum surface treatment method to increase adhesion with polyurethane coating

• Main Authors: Cereska, Deividas, Kontenis, Gabrielius, Zemaitis, Arnas
• Format: Patent
• Language: English
• Published: 20.04.2023
• Subjects: APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL; SOLDERING OR UNSOLDERING; SPRAYING OR ATOMISING IN GENERAL; TRANSPORTING; WELDING; WORKING BY LASER BEAM

A method for improvement of adhesion and distribution along the surface of coatings using a femtosecond laser is described. The process starts from chemical preparation or cleaning of the target material, surface predetermination, laser irradiation of the surface until a certain surface geometry is obtained, which gives the surface improved wetting properties and chemical surface activation which results in improved adhesion of the coatings on the target material surface. The surface geometries and dimensions to be obtained during irradiation are selected according to the properties of the coating and target material, including the laser parameters and/or the environment to obtain the desired surface geometry, considering possible geometry errors without compromising essential adhesion.