RU1781321C - Composition for cleaning metal surface from corrosion - Google Patents

Description

1

(21) 4842427/26 (22) 03/05/91 (46) 12/15/92. Bull. №46

(71) Production Association Plant them. Malysheva

(72) E.I.Yasnogorodsk and I.V. Novosad (56) Copyright certificate of the USSR

No. 249520, cl. C 23 G 5/036, 1968.

(54) COMPOSITION FOR CLEANING CORROSION

METAL SURFACE

2

(57) Usage: treatment of metal surfaces having corrosion before painting, preservation, and electroplating. SUMMARY OF THE INVENTION: the composition contains, g / l: phosphoric acid 400-450; paradioxybenzene 5-1 0; neonol AF 9-10 / AF 9-12 / 10-15 and hydroxyethylated pentaerythritol 5-7. 2 tablets

The invention relates to compositions intended for the treatment of metal surfaces having corrosion before painting, preservation, and electroplating.

A known composition for removing corrosion from metal surfaces is (1) a prototype comprising, g / l;

Tanning extract

(tannin) 50-70

Salicylic Acid 50-70

Orthophosphorna

acid300-350

Ethyl alcohol200-250

Guanidine salicylic 12-25

Water235-385

However, the composition does not sufficiently remove corrosion from the metal surface. After removal of corrosion from the metal surface, it is necessary to carry out the following passivation in connection with the fact that only for 1.0-1.5 hours the protective properties are preserved. The guanidine constituent salicylic acid and salicylic acid are deficient materials. Ethyl alcohol is a socially dangerous product.

The aim of the invention is to provide a composition for the chemical removal of corrosion from metal surfaces with high protective properties, reducing cleaning time.

This goal is achieved by the fact that in the composition containing phosphoric acid and water, para-hydroxybenzene, neonol AF and ethoxylated pentaerythritol are additionally introduced in the following ratio of components, g / l: Orthophosphor

acid400-500

Paradioxybenzene 5-U

Neonol AF9-10

(AF9-12) 10-15

Oxyethylated Pentaerythritol 5-7

Water Else.

The solution is prepared as follows:

The calculated amount of tap water is poured into a glass, porcelain or enameled container, after which a certain amount of phosphoric acid is added, the contents are mixed, and then the required amount is added.

(L

with

Yu

"&

the amount of neonol AF 9-10 (AF 9-12). After mixing, paradioxybenzene and ethoxylated pentaerythritol are added. The finished mixture is mixed. All operations are carried out at natural temperature. The solution is ready to use.

The preparation of five recipes of the composition are given in table 1.

In comparison with the prototype, the ability to wet the treated surface, the solubility of corrosion and mineral oil deposits, and the protection time were determined.

Tests of the prepared compositions and the composition taken for the prototype showed that the optimal compositions that give the best removal of corrosion from the metal surface are compounds II, III, IV, corresponding to the concentration of the solution to be applied. The inventive composition is resistant to environmental influences, as a result of which its period of use is unlimited, provided that it is stored in a hermetically sealed container.

During storage of carbon steel sheet grades: CT 3, CT20, SI40 under atmospheric conditions, corrosion forms on its surface. Samples of 70-150 mm in size were cut from such sheets. Then the surface of the samples affected by corrosion was subjected to processing in the proposed solution using rags. Structure

hot water was washed off the samples by immersion in a bath. Samples were dried with dry compressed air. Next, the samples were laid on racks, after which their condition was monitored (see table 2).

Cleaning was carried out for 3 min at a temperature of 20 ± 2 ° C.

The proposed composition reduces the cleaning time from corrosion of the metal surface, and also increases its protective properties.

Claims (1)

SUMMARY OF THE INVENTION A composition for cleaning metal surfaces from corrosion, containing phosphoric acid, a corrosion inhibitor, a surfactant and water, characterized in that, in order to reduce the cleaning time and increase the protective properties of the surface, it contains a corrosion inhibitor paradioxy sibenzene, and as surfactants neonol AF 9-10 (AF 9-12) and ethoxylated pentaerythritol in the following ratio of components, g / l: Orthophosphor w acid 400-450 Paradioxybenzene 5-10 Neonol AF 9-10. 9-10 (AF9-12) 10-15 Oxyethylated Pentaerythritol 5-7 Table 1 table 2