Overflateforberedelse

Overflateforberedelse refers to all actions carried out on a surface before applying coatings, paints, sealants, or linings. The goal is to remove contaminants, old coatings or residues, and to create a surface that promotes adhesion and durability of the subsequent layer. It is a central step in corrosion protection, architectural coatings, concrete repair, and wood finishing, and applies to metal, concrete, wood, and composites.

Common preparation methods include mechanical cleaning such as abrasive blasting, grinding, sanding, and wire brushing to remove material and create an adhesion profile. Chemical cleaning uses detergents, solvents, degreasers, and sometimes acid or alkali etching to remove oils and contaminants. Thermal methods like burn-off can be used on certain surfaces. In some cases, old coatings are stripped prior to re-coating.

Planning for overflateforberedelse involves assessing substrate type, potential damage, environmental conditions, and the compatibility of the chosen method with the subsequent coating. Key considerations include achieving adequate surface cleanliness, controlling moisture and dew point, avoiding damage to the substrate, and preventing recontamination during work. Verification may involve surface cleanliness tests, measurement of surface roughness, and adhesion tests after coating.

Standards and guidelines from organizations such as ISO, SSPC, and other regional bodies provide classifications for surface cleanliness and profile, guiding the selection of methods and acceptance criteria. Documentation and quality control are important to demonstrate that the surface meets project requirements.

Safety and environmental considerations include appropriate ventilation, containment of dust and waste, personal protective equipment, and safe handling and disposal of chemicals and blast media. Effective overflateforberedelse contributes to coating longevity, reduced maintenance, and better protection of substrates in industrial and construction settings.