SU1086772A1 - Composition of corrosion-preventive agent - Google Patents

Abstract

COMPOSITION OF ANTI-ROSE ELEMENT based on polyethylene and a volatile corrosion inhibitor, characterized in that, in order to improve the anti-corrosion properties of the element, as a volatile corrosion inhibitor, it contains a mixture of the calcium salt of acid oil tar and quaternary ammonium salt in a ratio of 3: 1 and an additional additive, selected from the group comprising mineral oil, nitrated oil, neutralized with calcium hydroxide and containing stearin, a condensate product and alkenyl succinic anhydride and urea, products t neutralize sulfonated oil with urea, with the trace of the ratio of components, wt.%: Polyethylene 25-40 Calcium mixture (L salt of acidic harsh on petroleum and fourth- ammonium salt 30-50 Additive 20-45 x O)

Description

The invention relates to the field of creating anticorrosive protection of metals using chemicals that chemically suppress corrosion of corrosion inhibitors, and can be used in the technology of preservation and packaging. The composition of the barrier packaging based on polyethylene in the form of a stick impregnated with volatile corrosion inhibitors is known. When sealing metal products with such compositions, a protective atmosphere is created inside the package, which is unfavorable to corrosion. A significant disadvantage of this composition is the impossibility of long-term storage of anti-corrosive elements due to premature volatilization of the inhibitor. Known anticorrosive compositions. polyethylene-based zionic elements containing oil-soluble corrosion inhibitors selected from the group consisting of: nitrated oil, neutralized with calcium hydroxide and containing stearin; condensation product of alkenyl succinic anhydride and urea; Product neutralizing sulfonated urea oil. The lack of such compositions is concluded. This is because they can only protect surfaces of metal parts that are in mechanical contact with elements based on the compositions. The closest to the invention to the technical essence and the achieved result is the composition of the anticorrosive element containing polyethylene and a volatile corrosion inhibitor - a mixture of inorganic salts: cL dicyclohexylamine, nitrite / -cyclohexylammonium, nitrzodicyclohexylamine. Melting points of chet with the general formulas. The disadvantage of this composition is the low level of anti-corrosion properties due to the inhibitor volatilization when processing the composition and encapsulation of the majority of the inhibitor injected into the polyethylene film. The aim of the invention is to improve the anti-corrosion properties of an element protecting metal parts from corrosion. To achieve this goal, the composition of the anti-corrosive element based on polyethylene and a volatile corrosion inhibitor contains as a volatile corrosion inhibitor a mixture of calcium salt of acid tar oil and quaternary ammonium salt in a ratio of 3: 1 and additionally an additive selected from the group comprising mineral oil, nitrated oil, neutralized with calcium hydroxide and containing stearin, a condensation product of alkenyl succinic anhydride- and urea, a neutralization product of sulfonated urea oil, with Due to the ratio of components, wt.%: Polyethylene A mixture of calcium salt of acid tar oil and quaternary ammonium salt. Additive A synergistic mixture of calcium salt of acid tar oil (ISKG-1 brand) and a quaternary ammonium salt, taken in a ratio, is used as a leaching corrosion inhibitor. 3: 1. (IFHAN, GOST 9.051-79). The high melting (decomposition) and boiling points of the mixture components (Tables 1 and 2) and the relatively small increase in the mixture volatility when heated allow the proposed composition to be processed using known equipment for plastics processing under standard conditions. Table 1 of the ammonium salts

-Wg

252 Table2 The main properties of the calcium salt of acid tar oil (TU 38101119-72) (100 ° С) 20 The temperature of the flask in an open crucible, Pour point, C-12. Mineral oil (MS-20), plasticizer of polyethylene and solvent of volatile corrosion inhibitor IFHAN, as well as contact oil-soluble corrosion inhibitors: AKOR (GOST 15171-70), which is a nitrated oil AK-9, neutralized with hydroxide, was used as an additive. calcium and stearin, SIM (TU 38-401111-75), the condensation product of alkenyl succinic anhydride and urea, BMP (TU 38101503-74) is the product of neutralization of sulfonated urea oil. The additive fulfills several functions in the composition of the anti-corrosive element: it is a plasticizer forming a colloidal solution with polyethylene, which, during crystallization, turns into a standard day;

The continuation of Table 1 serves as a solvent for the volatile corrosion inhibitor IFHAN, which allows the latter to be incorporated into the polymer composite; provides transportation of a volatile corrosion inhibitor from the volume of the anticorrosive element to its surface, since jellies have the ability to syneresis, i.e. spontaneous separation of the liquid phase. The combination of volatile and contact corrosion inhibitors allows an increase in the degree of anti-corrosion protection of metal products by bringing them into contact with the anti-corrosion element. Example 1. To obtain anti-corrosion elements, mixtures were prepared (Table 3), which include high-density polyethylene (grade 20606, -012, GOST 16338-77), volatile corrosion inhibitor IFHAN, additive: mineral oil MS-20 ( GOST 21743-76, compounds 4-7) or a corrosion inhibitor SIM (compounds 8-11). Comparison was carried out with the composition 12 (prototype), which included polyethylene and a volatile corrosion inhibitor - a mixture (1: 1: 1) o (-dicyclohexylamine, pj-cyclohexylammonium nitrite and nitrosodicyclohexylamine. Samples in the form of films with a thickness of 250 microns were made from the mixtures. Definition 250 μm thick films. Definition whether destructive stress is 6 when stretched according to GOST 11262-76, the average intensity I of evaporation of the inhibitor over 2 months is the weight loss of LM steel samples hermetically packed in film after aging in 1N HCt solution for 2 months. The data in Table 3. Sost and basic properties

As can be seen from the table, for compositions 1-3, which do not contain an additive, the characteristics of strength, volatility and anti-corrosion properties are at the level of the prototype (composition 12) or slightly higher. Compositions 4–7, containing an additive, have approximately an order of magnitude greater volatility and significantly better anticorrosive properties, however, their strength indicators are somewhat lower. Compounds 8-11, in which a contact corrosion inhibitor is used as an additive, with the same volatility as compounds 4-7, have higher strength and anti-corrosion properties. The results obtained indicate that the optimal combination of mechanical and anti-corrosion properties, providing an increase in efficiency compared to the prototype

anticorrosive elements, characterized by compositions 5, 7, 9, 11, which correspond to the ratio of components wt.%: 20 polyethylene 50, $ 30 corrosion inhibitor - 50; 25 additive 50.

. Example 2. It is required to protect the filming camera of the type SKS from corrosion during transportation and storage. The most accurate (for corrosion-resistant) components are precision mechanics enclosed in a sealed enclosure. For transport and storage, the lens hole in the chamber is closed with a plug of the following composition, wt.%: Polyethylene 40, IFHAN ZO; AKOR 30. The cap is made by pouring under pressure on an injection molding machine at temperatures of 430-455 K. 1086772 6 Table 3 anti-corrosion elements

7

llpii of the oOi-em of the plug to its surface, 65 cm and the evaporation rate of the 10L / CM inhibitor from the plug weighing 30-40 g per year 10-15 g of the inhibitor evaporated. Half of this amount is enough

in order to suppress the corrosion of metal parts to an acceptable level (-h) in an insignificant volume chamber (, 010 m). Example 3. A container that is to be sealed with a screw cap under the storage conditions of enclosed products is protected against corrosion. It contributes to the flow

in the gap, the lid-capacitance of crevice corrosion and leads to the fact that the corroded crush can not be opened.

Using a molding method, a gasket is made from the composition, wt.%: Polyethylene 30, IFHAN 50, BMP 20. Installed under a cover of about 100 cm, having a volume to surface ratio of 0.3 cm, provides evaporation of at least 10 g of the inhibitor in year. Combined with contact corrosion inhibitor, which is due to syneresis, this is enough to protect the cover-capacity screw connection from crevice corrosion for 2 years.

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Advantages of the proposed composition:

the composition possesses higher anticorrosive properties in comparison with the prototype, due to 5 delivery of inhibitors from the volume to the surface of anticorrosive elements using the syneresis mechanism;

When processing the composition and the storage of anticorrosive elements, 10 no special measures are required to prevent the corrosion inhibitor from premature evaporation.

The composition provides, along with the general anticorrosive protection of 15 products by volatile corrosion inhibitors, local protection of the most critical areas of the product with the help of contact corrosion inhibitors

the physicomechanical and anticorrosive properties of the elements can be adjusted over a wide range by changing the concentration of the additive that is included in the composition.

The economic effect of using the invention can be obtained by eliminating labor-intensive processes for the preservation of hardware. A reduction in the labor intensity of packing and preserving the instrument

0 products with the use of anticorrosive elements of the proposed composition of 14%.

Claims (1)

COMPOSITION OF AN ANTICORROSIVE ELEMENT based on polyethylene and a volatile corrosion inhibitor, characterized in that, in order to improve the anticorrosion properties of the element, it contains a mixture of calcium salt of acid tar oil and quaternary ammonium salt in a ratio of 3: 1 and an additional additive selected as a volatile corrosion inhibitor from the group comprising mineral oil, nitrated oil, neutralized with calcium hydroxide and containing stearin, a condensation product of alkenyl succinic anhydride and urea, a product of neutral alizatsii sulfonated oils with urea, with the following component ratio, wt.%: Polyethylene 25-40 A mixture of calcium salt, acidic tar * * in oil and four. ammonium tic salt 30-50 Additive 20-45 * The disadvantage of this composition is the low level of anticorrosion properties due to the volatilization of the inhibitor during processing of the composition and encapsulation of most of the introduced inhibitor in a plastic film. The aim of the invention is to improve the anticorrosive properties of an element that protects metal parts from corrosion. To achieve this goal, the composition of the anticorrosion element based on polyethylene and a volatile corrosion inhibitor contains, as a volatile corrosion inhibitor, a mixture of the calcium salt of acid sludge of oil and quaternary ammonium salt in a ratio of 3: 1 and in addition up to ¹ surfactant selected from the group consisting of nitrated mineral oil an oil neutralized with calcium hydroxide and containing stearin, a condensation product of alkenyl succinic anhydride and urea, a product of neutralization of sulfonated oil with urea, when the following ratio of components, wt.%: Polyethylene I Mixture of calcium salt of acid sour oil tar and quaternary ammonium salt Additive _; A synergistic mixture of calcium salt of acid sour oil tar (ISKG-1 trademark) and quaternary ammonium salt taken in co ₍ 3: 1 ratio. (IFKHAN, GOST 9.051-79) is used as a lethal corrosion inhibitor. High melting points (decomposition ) and the boiling of the components of the mixture (Tables 1 and 2) and the relatively small increase in the volatility of the mixture when heated allow the proposed composition to be processed using known equipment for processing plastics under standard conditions. Table 1 Melting points of quaternary ammonium salts with the general formula R _H N ⁺ X ~ About Temperature, With n-pentyl | iso-pentyl