Verfahren zum Schützen der Oberfläche von Gegenständen aus eisenhaltigen Werkstoffen gegen atmosphärische Korrosion

The surface of a ferrous metal article is protected from atmospheric corrosion by treating it with an oil-in-water emulsion in which the oil phase contains in solution a derivative of ortho-phosphoric acid containing a first hydroxyl group, the hydrogen atom of a second hydroxyl group being replaced by an alkylated aryl radical whose alkyl group contains at least 8 carbon atoms, and the third hydroxyl group being either a free group or having its hydrogen atom replaced by an alkyl group containing not more than 4 carbon atoms, and drying the thus treated surface. The oil may be a mineral oil or an ester oil of animal or vegetable origin, e.g. castor oil or linseed oil; many examples are given of orthophosphoric acid derivatives that may be used. The emulsion may be made by dissolving the orthophosphoric acid derivative in the oil, preferably at raised temperatures, and then agitating the resulting solution with its own volume of water, the emulsion thus produced being further diluted with water as required. The article may be totally immersed in the emulsion or the emulsion may be painted or sprayed on the article, and then drying is preferably effected by draining the surface and then heating it. Specifications 699,080, 709,628 and 743,752 are referred to.ALSO:The surface of a ferrous metal article is protected from atmospheric corrosion by treating it with an oil-in-water emulsion in which the oil phase contains in solution a derivative of orthophosphoric acid containing a first hydroxyl group, the hydrogen atom of a second hydroxyl group being replaced by an alkylated aryl radical whose alkyl group contains at least eight carbon atoms, and the third hydroxyl group being either a free group or having its hydrogen atom replaced by an alkyl group containing not more than four carbon atoms, and drying the thus treated surface. The oil may be a mineral oil or an ester oil of animal or vegetable origin, e.g. castor oil or linseed oil; many examples are given of orthophosphoric acid derivatives that may be used. The article may be totally immersed in the emulsion or the emulsion may be painted or sprayed on the article, and the drying is preferably effected by draining the surface and then heating it. Specifications 699,080 [Group III], 709,628 and 743,752 [Group III] are referred to.