Method of coating metallic surfaces

Details Method of coating metallic surfaces Method of coating metallic surfaces

C - Chemistry, Metallurgy

25

D

204/96.21

C25D 13/06 (2006.01) C08G 59/68 (2006.01) C09D 5/44 (2006.01)

Patent

CA 1243626

- 1 - 3-14982/-/ARL 353 ABSTRACT METHOD OF COATING METALLIC SURFACES Metallic surfaces, especially of ferrous metals, are coated by passing an electric current at a voltage of at least 15V 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 Image 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 -2- polymerised 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. This process gives a very rapid coating on the metallic surface without the need for special formulations to render the epoxide resins electrodepositable.

485035

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