Nickel-free phosphating process

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 22/42 (2006.01) C23C 22/17 (2006.01) C23C 22/18 (2006.01) C23C 22/36 (2006.01) C23C 22/44 (2006.01)

Patent

CA 2171180

The invention concerns a method of phosphatizing steel, zinc-coated steel and aluminium using phosphatization solutions containing hydroxylamine and/or nitrobenzene sulphonate, these solutions being largely free of undesirable nickel, nitrites and nitrates as well as being free of copper and oxo-anions of halogens.

L'invention concerne des procédés de phosphatage de l'acier, de l'acier galvanisé et de l'aluminium, à l'aide de solutions de phosphatage contenant de l'hydroxylamine et/ou du nitrobenzènesulfonate. Ces solutions sont exemptes, dans une large mesure, de nickel, de nitrite et de nitrate, de même que de cuivre et d'oxy-anions d'halogènes.

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