| 摘要 |
<p>1,153,202. Coated steel. HUTTENWERK OBERHAUSTEN A.G. 12 July, 1966 [18 Feb., 1966], No. 31209/66. Heading B2K. [Also in Division C7] Steels which are to be used for external facings of buildings are formed with a coating of rust by applying an aqueous solution of an iron salt, e.g. nitrate, and a heavy metal, e.g. Cu or Ni, sulphate, and then applying a protective film which is permeable to water vapour. The film may comprise natural or synthetic resins, waxes, silicones or cellulose or rubber derivatives and may include silica gels or the stearates or carbonates of Zn or Al. The aqueous solution may comprise (% by weight):-iron nitrate 5 to 15, copper sulphate 0.1 to 2, nickel sulphate 0.1 to 2, glycerine 0.1 to 1, oxalic acid 0.1 to 2, wetting agent 0.01 to 0.1 alcohol 10 to 50, water-balance. The protective film may comprise (% by weight):- cyclo rubber 5 to 40, carbon tetrachloride 40 to 90, silica gel 2 to 20, ferrous hydroxide 0.1 to 2.0, higher alcohol (12 carbon atoms) 0.1 to 2.0.</p> |
