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2 271 407

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C2

(51)

IPC

C23C22/50(2006-01-01)

(21) (22)

Application

2003104684/02, 2003-02-19

(24)

Start date

2003-02-19

(22)

Actual filing date

2003-02-19

(45)

Published

2006-03-10

(72)

Inventor

Prozorov Valerij Vladimirovich

(73)

Holder

Prozorov Valerij Vladimirovich

METHOD OF PASSIVATION OF EQUIPMENT MADE FROM PEARLITE STEELS AT MINOR AMOUNT OF REAGENTS Russian patent published in 2006 - IPC C23C22/50 

Abstract RU 2271407 C2

FIELD: forming corrosion-resistance coats on inner surfaces of power equipment made from pearlite steels.

SUBSTANCE: proposed method includes forming of passive oxide coat by aqueous solution of chemical reagents containing nitric acid ions and aluminum ions followed by treatment in nitrite aqueous solution; coat is formed by aqueous solution containing nitric acid in the amount of 25-50 mg/kg and aluminum nitrate in the amount of 10-50 mg/kg at temperature of 80-100°C; procedure continues for 3-5 h; solutions are prepared in desalted water.

EFFECT: reduction of concentration of chemical reagents at enhanced protective properties of coats with no increase of temperature in treatment.

3 cl, 6 tbl, 6 ex

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RU 2 271 407 C2

Authors

Prozorov Valerij Vladimirovich

Dates

2006-03-10—Published

2003-02-19—Filed

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