| 摘要 |
<p>Metallic surfaces, especially of ferrous metals, are coated by passing an electric current at a voltage of at least 15 V between the metallic surface as anode and a cathode in contact with a composition comprising (A) an epoxide resin, and (B) a salt of formula [Ay+] [Z-]y where Ay+ denotes a cation which is a metal, a metal complex an organometallic, a heterocycle, a sulphoxonium, ammonium, a substituted ammonium or a phosphonium ion, y denotes 1, 2, or 3, Z- denotes an anion selected from perchlorate, trifluoromethane sulphonate pentafluorohydroxoantimonate, and the complex anions of formula MQd-, M represents a boron, phosphorus, antimony or arsenic atom Q represents a halogen atom, and d is 4 or 6 and is one more than the valency of M, whereby polymerized epoxide resin is deposited on the metallic surface. Typical salts (B) include sodium, potassium, magnesium, ammonium, substituted phosphonium and substituted ammonium trifluoromethane sulphonates, perchlorates, tetrafluoroborates, hexafluorophosphates, hexafluoroarsenates, and hexafluoroantimonates.</p> |
