seen with a wax overdraga for underwater use intended utvendig surface at its anvendning star in stendig contact with sea water

摘要

Surfaces for underwater use are coated with wax, applied as an aq. wax dispersion, pref. contg. 15-75 (25-60) wt. % wax/wt. of dispersion and having viscosity 1.5-75 (2-50) degrees Engler at 20 degrees C. Final wax coating thickness is 5-500 (pref. 50-300) mu, allowing controlled migration of biocides from an opt. anti-fouling coating below wax coating. Migration is appreciable through wax coating thickness of 10-49 mu. Used for reducing surface-roughness and corrosion of ships and stationary or mobile underwater constructions, e.g. supports for off-shore drilling rigs or prodn. platforms. Aq. dispersions can be applied evenly to form smooth films; films thickness is easily adjusted; wax can be applied at ambient temps., with spray devices; biocides are easily worked in.