ELECTROLYTE FOR BLACK CHROMATIZING OF ZINC Russian patent published in 1999 - IPC

Abstract RU 2137861 C1

FIELD: metal coatings. SUBSTANCE: invention relates to applying black chromium-containing films on zinc and galvanized steel to use them as protection-decorative coatings and as absorbing surfaces of solar-plant heating elements. Electrolyte of invention contains, g/l: chromic anhydride 20-60, sodium sulfate 15-20, sodium nitrate 5-10, copper acetate 15-25, lead nitrate 0.2-0.9, and compound with formula 0.1- 0.5. Sulfuric acid is used to adjust pH of solution to 1-1.5. EFFECT: increased corrosion protection and solar emission absorption. 1 tbl

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RU 2 137 861 C1

Authors

Rudenko M.F.

Kravtsov E.E.

Idiatulin S.A.

Makarova N.A.

Cherkasov V.I.

Kudjakov M.V.

Dates

1999-09-20—Published

1997-02-27—Filed