Painting and coating in a marine environment of metal elements and sea vessels constitutes, in our view,the cutting edge of the industrial painting sector.
The environmental characteristics require the metal bodies to be partially or fully immersed in seawater and subjected to constant aggressive corrosive attacks during and after the application of the coating systems.
Furthermore, the exterior coating system applied to vessels, which often is no thicker thanthe thickness of a sheet of paper , is what will be the only protective barrier between the metal body and the water environment in which it is propelled.
In view of this, the application of a coating system in a marine environment requires adherence to strict application standards and ongoing testing in process.
Renewal of costing system for sea vessels and structures in a marine environment is comprised of several major stages:
- Full removal of the old coating until a corrosion-free metal base is obtained in accordance with the SA-2.5 standard.
- Application of (1-2) primer layers of the epoxy family of materials especially adapted to marine environment. Occasionally, use will be made of a coating with a cathode galvanic protection (such as zinc paints).
- Application of (3-5) intermediate layers of materials of the epoxy or vanillin families with properties of multiple solids and multiple thicknesses properties.
- Application of the top layers according to the specified environment. In sea vessels, use will be made of three-layer antifouling coating with toxin release to prevent barnacles from attaching to the bottom of the vessel, to prevent the vessel from slowing down when moving in the water. In elements and structures near the sea, use will be made of 2- to 3-layer UV-resistant polyurethane coating system with his impermeability properties to prevent penetration of chlorides and other salts.
- The application of the paint system is lengthy and depends on the waiting times (time windows) for full curing of a layer than was applied before the application of the next layer.
- The dry film thickness of the systems ranges from 500 to 800 microns, depending on the specification.