De-icing fluid on the basis acetate

 

The invention relates to anti-icing fluids. Anti-icing fluid includes, g/l: sodium benzoate 2,0-8,0, a mixture of trisodium phosphate and dinatriumfosfaatti mass ratio of 1:5 10,0-15,0, sodium nitrite 0.2 to 0.8, liquid glass 2,0-10,0, glycerin, pre-treated with sulfuric acid in a ratio of 1:0,5 0,5-3,0, aqueous potassium acetate solution with a density of 1.20-1,26 and pH 9-11 - the rest. The technical result is the production of environmentally safe composition for low (not more than 0.1 g/m2h) corrosion losses. table 2.

In connection with the release of the OST 54-830.4-99 have any need for significant improvement in corrosion properties of anti-icing fluids (YLL) for runways of airfields. In accordance with the above OST corrosion loss of metal in YLL should not exceed 0.1 g/m2including Weight corrosion losses in the Russian practice of standardized YLL for the first time, and foreign developments and technical literature allowable corrosion losses are significantly higher (EP 0375214, national US standard AMS 14350).

Also known compositions anticorrosive additives (SU 1827382 And class With the traditional additives in acetate YLL can not provide the newly approved requirements of the Russian standards.

The present invention is directed to the solution of the technical problem to ensure low (not more than 0.1 g/m2h) corrosion losses of ferrous and non-ferrous metals when exposed to YLL on acetate base.

According to the invention an aqueous solution of potassium acetate is prepared by mixing at a temperature not lower than the 20oWith aqueous solutions of acetic acid, caustic potash and potash to pH 9,0 11,0...and as additives (grams per liter of an aqueous solution of potassium acetate) following components: 1. Low-modulus (M=1) liquid glass any alkali metal. obtained by conducting the reaction between aerosol and aqueous solution of alkali metal hydroxide...10,0 2,0.

2. The glycerol-treated concentrated sulfur acid 0,5...3,0.

3. Salts of phosphoric acid 10,0 15,0....

4. Sodium benzoate...8,0 2,0.

5. Sodium nitrite 0,2...0,8.

The complex composition of the inhibitor additives due to the complexity of the problem: typically, the inhibitors are recommended for any one of metal, with the same inhibitor may be a stimulant corrosion of other metals (A. Altsybeeva, S. Levin. The corrosion inhibitors of metals. L.: Chemistry. 1968).

In this case, it is necessary to provide the corrosion inhibition simultaneously the metal.

The complexity of the task is also due to the need to ensure environmental cleanliness additives: YLL in large quantities is poured directly onto the runway of the airfield, therefore, in the soil. An additional difficulty was the need to use only materials, industrial output in the country.

Using special technology and special kind of liquid glass is due to the fact that the inhibitors are introduced in the highly concentrated solution, which immediately coagulates conventional liquid glass.

Sulfurized glycerin contains artificial radicals acidic. The presence of inhibitors with acidic and alkaline reaction provides a comprehensive inhibition is an extremely complex process of formation of films or passive, or waterproof, or films combined type.

Salts of phosphoric acid, which makes the solution of phosphates inhibitors for ferrous and some nonferrous metals differently shift the pH in the alkaline region. So use trisodium phosphate and centripetal in the ratio of 1:5.

Sodium benzoate - inhibitor metals in the environment, works well in thin disappearing from drying Yu, what is also important in the context of collapsing films YLL.

Sodium nitrite is due to oxidative processes are well protects metals on iron base.

Technology introduction inhibitors in an aqueous solution of potassium acetate in dry or dissolved form is simple: they are entered in any sequence in the cold or hot solution with stirring.

The invention is illustrated with specific examples describing the content of the corrosion inhibitors (table 1) and the results of the corrosion tests (table 2).

Corrosion tests were carried out according to the methods OST-54-830.4-99.

From the above examples that the proposed additive is optimal and provides the required technical result.

Claims

De-icing fluid for runways of airfields on acetate base containing as anti-corrosive additives sodium benzoate, tri-sodium phosphate and glycerol, wherein the corrosion inhibitor further comprises centripetal, sodium nitrite and water glass when the following ratio of components, g/l:

Sodium benzoate 2,0-8,0

A mixture of trisodium phosphate and dinatriumfosfaatti in massoudy sulfuric acid in the ratio of 1:0,5 0,5-3,0

Aqueous potassium acetate solution with a density of 1.20-1,26 and pH 9-11 Else

 

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