| 摘要 |
1375442 Electrodepositing compounds STAHLWERKE PEINE-SLAZGITTER AG 26 Jan 1972 [26 Jan 1971] 3660/72 Heading B2E [Also in Divisions Cl and C7] A metal body is provided with a corrosionresistant coating consisting essentially of an inorganic precipitate and an ion-exchange substance forming a matrix for the precipitate and bonded thereto by ion exchange to provide a three-dimensional cross-linked corrosion-resistant coating with the precipitate, the inorganic precipitate and ion-exchange substance forming alternate layers. The ion-exchange agent may be a zeolite, especially in the form of an aqueous extract of iron ore sinter, and may be admixed with a hexa- or metapolyphosphate. A brass tube is protected by use of industrial water containing CaCO 3 and also containing ion-exchange agent while, in the case of iron, CaCO 3 -containing water is applied first followed by water plus ion-exchange agent. For a copper surface, copper sulphide is utilised as the precipitate. A dye or pigment may be added to the liquid from which the precipitate is deposited. |
