SU1254058A1 - Composition for cleaning metallic surface - Google Patents

Description

The invention relates to chemical cleaning of metals and can be used in shipbuilding, in mechanical engineering for cleaning metal structures and products from fatty and oily contaminants, and for preparing the surface before coating.

The aim of the invention is a degree of purification.

The metal surface cleaning solution is prepared as follows.

The solution is prepared by successively dissolving phosphoric acid and NP-3 sulfonic acid in water. A portion of casein is pre-filled with a hundred-fold volume of water. After 30-40 minutes of swelling, the resulting mass is transferred to a degreasing bath, and the solution is thoroughly mixed.

The degree of surface cleaning is determined by the photocalorimetric method. Steel samples with fatty contaminants pre-applied onto their surface (mixture of machine-50 with grease 9: t) are degreased in the test solution.

Sulfonol NP-3 4 5 5.5 6.0 7.0 Casein 0.15 0.2 0.25 0.3 0.3

Water Up tOOO Up to 1000 Up to 1000 Up to 1000 Up to 1000

The choice of the range of the content of the components is due to the fact that a decrease in their content below the limiting one leads to a deterioration of the degreasing properties of the solution. An increase in the concentration of the maximum is not accompanied by an improvement in the cleaning properties of the electrolyte and is not economically feasible. The concentration of casein, equal to 0.3 g / l, corresponds to the concentration of the test, under these conditions.

Comparative data, characterization of the work of the known and proposed

and washed. The mass of the applied soil is determined by the mass difference between the oily and clean samples. The oils remaining on the surface are diluted in a constant (5 ml) volume of carbon tetrachloride. The optical density of the solution obtained is measured using a FEC-56M photo calorimeter. A mercury-quartz lamp type SVD-120 W is used as a light source.

The amount of dissolved oil is determined from a previously constructed calibration curve.

The cleaning action of the solution is determined by the following formula:

t%

- RK

100,

 where r

- mass of contamination applied to the sample; P is the mass of residual impurities (g).

In tab. 1 shows the compositions of the proposed solution for cleaning metal surfaces in examples 1-5.

The working temperature of the solutions is 20 ° C; the cleaning time is 3 minutes. Table 1

45

 cleaning (washing action- "JPIfSk.- The well-known method 74 88

The desired solutions are 2-4.

88

Table 2

Examples

 88

PEP

92 94 93

93

Op t acid phosphorus

Sul1gonol NP-Z Sol on acid Urotropin Casein

Cleaning ability,%

Adhesion paintwork points

As follows from the data in the table, the cleansing properties of the proposed solution are higher than those known at various concentrations of the components .55

The proposed tool is stable in operation, fire - and explosion-proof and can be used for

77

1,3

0.25 94

one

cleaning of metal surfaces in submersible baths at. Cleaning time 3 min.

The use of the solution reduces the labor intensity of the process by eliminating manual labor and improves productivity by reducing the cleaning time.

Claims (1)

METAL SURFACE CLEANING SOLUTION containing orthophosphoric acid and sodium alkylbenzenesulfonate based on oC-olefins (sulfonol NP-3), characterized in that, in order to increase the degree of purification, it additionally contains casein in the following ratio, g / l: Orthophosphoric Acid 30-40 Sulfonol NP-3 5-6 Casein 0.2 - 0.3 SU „„ 1254058 1 1254058