IMPROVED METHOD FOR NICKEL-FREE PHOSPHATING OF METAL SURFACES Russian patent published in 2021 - IPC C23C22/18 C23C22/36 C25D13/20 

Abstract RU 2748349 C2

FIELD: metal surface phosphating.

SUBSTANCE: invention relates to nickel-free phosphating of a metal surface. The method involves treating the metal surface with an acidic aqueous phosphating composition containing zinc ions, manganese ions, iron (III) ions, phosphate ions and less than 0.3 g/l of nickel ions, while the phosphating composition has an acidity index ranging from 0.03 to 0.065. An acidic water phosphating composition for nickel-free phosphating of a metal surface and a metal surface with a phosphate coating are also proposed.

EFFECT: improved adhesion of the subsequent applied paint coating and protection against corrosion, as well as increased stability of the bath tub are provided.

16 cl, 9 dwg, 5 tbl, 4 ex

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RU 2 748 349 C2

Authors

Dalenburg Olaf

Shmajer Liza

Dates

2021-05-24Published

2017-01-18Filed