RU2430130C2 - Priming composition for protecting metal surfaces from corrosion - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: composition contains the following in wt %: 16-23 film-forming agent; 38-40 mixed pigments; 2.0-3.0 organic complexing agent - tanning and derivatives thereof; 1.0-2.0 inorganic filler - talc; 3.0-4.0 mixture of C₂-C₄ alcohols and an organic solvent - the rest. The film-forming agent is 12-15 wt % alkyd varnish and additional 4-8 wt % synthetic chlorinated rubber. The mixed pigments are in form of a mixture of zinc oxide, zinc powder and micaceous iron. The mixture of alcohols contains ethyl alcohol, butyl alcohol and isobutyl alcohol in ratio 1.0:1.0:1.4. The invention enables to obtain compositions with service life of coatings of at least 10-15 years.

EFFECT: coatings have good impact properties and high rate of drying, priming composition does not require surface mechanical pre-treatment in order to remove scales and rust.

6 cl, 3 tbl, 3 ex

Description

The invention relates to single-pack cold-drying compositions such as a rust converter (primers, primer-paint, primer-enamel) and can be used for the manufacture of single-layer and multi-layer coatings in various industries for overhauls of engineering and hydraulic structures, power plants, chemical and metallurgical equipment industry, power transmission towers and other industrial metal structures made of ferrous metals, operated in conditions of intense atmospheric exposure, Orsk and fresh water.

Intensive atmospheric exposure requires the use of effective methods of surface preparation when applying any coatings to ensure long-term protection of the metal from corrosion.

The relative change in the service life of the coating from the method of surface preparation is characterized by the following data, years: abrasive blasting - 8; thermoabrasive - 7; chemical cleaning (acid etching) - 6; cleaning with a mechanized tool - 5.5; manual cleaning of rust - 4; the use of rust converters - 1.5 (A.S. Drinberg et al. Anticorrosion primers. St. Petersburg, 2006).

In some industries, the use of rust converters is not recommended, especially in medium- and highly aggressive environments. As can be seen, the nature and condition of the surface to be protected is to a large extent a determining factor in corrosion protection, since the corrosion destruction of the metal is associated with the formation of a complex, unstable composition of rust and scale, which must be removed before coating.

Rust is a mixture of hydroxides and oxides of ferrous and ferric iron, as well as iron sulfates and chlorides, present in significant quantities in an industrial atmosphere.

Scale is a product of gas metal corrosion, occurs during the rolling of steel at a temperature of 500 ° C and higher and consists of iron oxides: oxide - FeO, magnetite - Fe ₃ O ₄ , hematite and maghemite - Fe ₂ O ₃ . The thickness of the scale layer is 5-80 microns. Coating of scale, including the rust converter, is not allowed. It must be removed by blasting or chemical cleaning. The costs of blasting at the same time reach 60-80% wt. of the total cost of coverage.

Numerous one- or two-pack compositions are known in science and technology in organo- or water-borne forms of various efficiencies designed to protect corroded surfaces from corrosion.

So, for example, industrially produced compositions for protecting metals from corrosion based on various film-forming agents - alkyd - of varying degrees of fat content, epoxy, styrene-alkalide, phenolic, polyvinyl, polyvinyl chloride and others are widely known. Known compositions also contain alcohols, anti-corrosion pigments, corrosion inhibitors, complexing agents, fillers, organic solvents, phosphoric acid or phosphonium compounds (see, for example, A.S. Drinberg et al. “Anticorrosion primers.” St. Petersburg, 2006, p .86-93; I.L. Rosenfeld et al. “Anticorrosion primers and inhibited paint coatings.” M .: Chemistry, 1980, p.142-152, Reviews: V. A. Voitovich. “The triumph of rust converters.” Journal “StroyPROFIL”, No. 3 (49) and No. 4950), 2006, V.A. Voitovich. "Rust Converters, Their Past and Present." The journal "Corrosion: materials, protection", No. 10, 2005, p.32-37).

Also known is a composition for protecting and restoring corroded surfaces, including, wt.%: 20.0-30.0 epoxy diane resin with an epoxy equivalent weight of 450-500; 12.0-25.0 pigments; 12.0-25.0 fillers; 20,0-30,0 polyamide hardener Versamide 115, organic solvent - the rest. [Patent RU No. 2304601, IPC C09D 5/08, C09D 5/12, C09D 163/02, 2007.]

A known composition containing, wt.%: 8-20 butadiene-styrene thermoplastic elastomer DST-30; 9-17 inden-coumarone resin; 0.7-3.0 epoxy diane resin; 18-21 pigment filler "Procal"; 1.2-3.0 carbon black P-803; 1.2-1.6 water repellents - PMS-200 polymethylsiloxane liquid; 0.1-0.2 stabilizer "Naphtham-2"; toluene - the rest. [Patent RU 2245892, IPC C09D 109/06, C09D 5/08, C09D 109/06, C09D 157: 02, C09D 163: 02, C09D 183: 04, 2005.]

Closest to the intended purpose and the technical result achieved is a composition for protecting the surface of metal products and structures from corrosion, containing, wt.%: 20.0-44.0 binder, which is used as an alkyd varnish PF-053 or GF- 352 and alkyd-styrene resin; 7.0-23.2 pigments - zinc phosphate, aluminum powder, carbon, zinc tetraoxychromate, etc .; 5.0-22.0 filler - microtalc, mica, microbarite; 0.8-5.0 anticorrosive additive - tannin and its derivatives; 0.5 thickener; 0.5 additives to improve surface properties; 0.5 styrene linseed oil and an organic solvent - the rest (patent RU No. 2246512 C1, 02.20.2005).

Known compositions generally relate to one of the following types of materials: primers-converters, converters of rust or primer-paint (primer-enamel) for rust and are applied to the surface of products and structures in one of three ways: penetration (impregnation) using impregnation compositions; the use of rust stabilizers; application of rust converters. Primer paints (primer enamels), which include the prototype, are recommended for use as an independent coating or as part of complex protective coatings, the rest of the materials are used only as primers for paintwork.

All rust compositions known in literature and technology in one way or another inhibit the corrosion process by realizing the insulating properties of the coating, but even the best of them do not provide 100% isolation from the aggressive environment.

The penetration of water through the coating contributes to the continuation of corrosion under the film, which is even more dangerous than surface corrosion. Violation of the continuity of the coating as a result of mechanical stress and temperature changes during the operation of structures cause accelerated corrosion under the film. In addition, all known compositions, including the composition of the prototype, are used when the thickness of the rust is not more than 100 μm, and when coating on scale, especially thick-layer, are unsuitable. Coating on a surface with a scale thickness of 5-80 microns is possible only after blasting or after chemical etching, which is unacceptable for large structures.

The present invention is the creation of a quick-drying primer composition that can be used to protect a metal surface with a thick layer of rust and / or scale without prior mechanical processing.

The problem is solved in that a composition is proposed containing a film former, which is used as an alkyd varnish, mixed pigments, a complexing agent, an inorganic filler and an acceptable organic solvent, while the film former further comprises synthetic chlorinated rubber, a mixture of zinc oxide and zinc powder is used as mixed pigments and mica iron, an organic complexing agent is used as a complexing agent and further comprises a mixture of alcohol in type C ₂ -C ₄ in the following ratio of components, wt.%:

Film former, including: 16-23 - alkyd varnish (based on non-volatile 12-15 balance) - synthetic chlorinated rubber 4-8 Pigments, including 38-40 - zinc oxide 3.0-4.4 - zinc powder 13.2-17.6 - mica iron 13.5-18.0 Inorganic filler 1.0-2.0 Organic Complexing Agent 2.0-3.0 Alcohol mixture type C ₂ -C ₄ 3.0-4.0 Organic solvent rest

Alkyd varnish is used in the form of semi-finished varnish PF-053 with an acidity of not more than 20 mg KOH / g according to TU 2311-277-05744283-2007 or another regulatory document for the quality corresponding to the quality of the specified varnish. PF-053 alkyd varnish is a semi-finished pentaphthalic varnish in the form of a solution of pentaphthalic resin modified with vegetable oils, fatty acids of vegetable and tallow oils in organic solvents, produced on an industrial scale and is widely known to specialists as a material for the manufacture of pentaphthalic coatings (Livshits M. L., Pshiyalkovsky B. I. “Paintwork materials. Moscow, Chemistry, 1982, p.21-35).

Synthetic chlorinated rubber used as a modifier corresponds to a chlorinated olefin polymer with a chlorine content of 63-65 wt.%, Brand PERGUT S20 manufactured by Bayer or other brands and manufacturers with a similar characteristic. Chlorinated rubber PERGUT S20 is a synthetic chlorinated rubber, i.e. chlorination product of synthetic isoprene rubber. PERGUT S20 is a fully chlorinated olefin polymer with a density of 1.5 g / ml of the general formula C ₁₀ H ₁₁ Cl ₇ . The specified chlorinated rubber is a complete analogue of chlorinated natural rubber and is used for the same purposes - for the production of protective paints, coatings, adhesives for metal.

Alkyd modification with chlorinated rubber is carried out by physical mixing with slight heating (up to 40 ° C). The joint use of adkyd varnish and synthetic hot rubber as a film former leads to the fact that chlorinated rubber molecules are attached to OH ^- alkyd resin groups, forming a modified film former with new properties.

As a mixed pigment, a mixture of zinc powder, synthetic or natural mica iron (iron mica) and zinc oxide is used, preferably in the ratio, wt.%: Zinc powder 44, mica iron 45, zinc oxide 11. Any highly dispersed powder is used as zinc powder domestic or imported, the quality of which corresponds to ISO 3549: 1995, regardless of the shape of the particles. Zinc oxide should contain 99.0-99.5 wt.% The basic substance and comply with GOST 10262-73. Synthetic or natural mica iron (iron oxide) is used in the form of transparent gray flakes according to ISO 10601, for example, MIOX SG, MIOX DB brands with a metallic luster from Kertner Montan Industry or other brands or other manufacturers whose quality corresponds to ISO 10601.

As an organic complexing agent, tannin (gallic acid glucoside) and its derivatives (esters of phenolcarboxylic acids and simple carbohydrates contained in plants) are used, for example, preparations according to TU 6-09-50-2366-80 or TU 937327200281074- 00, or one of the known dioxibenzenes, for example, pyrocatechol or resorcinol. Preferably, the use of imported derivatives of tannin under the trade name Korrodur company Schwegman (Germany) or Ascophor-AC company Cognis (Germany). Tannin is available in the form of a technical amorphous powder of light yellow color, soluble in water, alcohol and acetone and containing 80-81% wt. the main substance.

For the preparation of a mixture of alcohols of type C ₂ -C ₄ , normal and iso-building alcohols are used, in particular ethyl alcohol (GOST 18300), butyl alcohol (GOST 5208) and isobutyl alcohol (GOST 9805). Alcohols are preferably used in the ratio: ethyl: butyl: isobutyl alcohols = 1.0: 1.0: 1.4, respectively.

As an organic solvent, any solvent suitable for these purposes is used, for example, xylene petroleum according to GOST 10214-78.

As the inorganic filler, any substance known for these purposes can be used, for example, talc, microtalc, finntalk of the brand M15 SQ or any other with a particle content of less than 20 microns of at least 95 wt. %

Comparison of the claimed composition with the known allows us to conclude that it meets the criterion of "novelty", because the proposed composition contains a new film-forming, a new mixed pigment, a new impregnating mixture of alcohols, an organic complexing agent in a certain ratio of components.

It is known that coatings reliably protect the surface of iron and steel from corrosion, providing electrochemical protection, since the nature of the process of rust formation in the atmosphere, water and soil is electrochemical. It is also known that the products of atmospheric corrosion of iron are rust, which consists mainly of hydroxides of various degrees of oxidation and iron salts, and the products of thermal oxidation of steel are scale, which is a mixture of oxides of ferric and ferric. Rust in a humid atmosphere has a more positive potential than iron (steel), so a corrosive current appears on the surface, which leads to the rapid destruction of the metal. Scale does not have a positive potential, however, due to its brittleness and unevenness in thickness, it forms cracks, which leads to a loss of continuity and, as a result, the appearance of rust. The heterogeneity of the nature and phase composition of iron corrosion products, the existence in various crystalline forms - minerals that create a positive potential on a steel surface, have not allowed to create methods for reliable long-term protection of corroded surfaces without the use of blasting. Among the variety of corrosion products, rust contains a small amount of complex iron oxide Fe · Fe ₂ O ₄ - magnetite, which has significant differences from other corrosion products, is a dense substance, firmly adhered to the metal substrate due to the proximity of the crystal lattice constant to the lattice constant iron is not hygroscopic, conductive, has ferromagnetic properties, does not acquire a positive potential, therefore, does not intensify electrochemical corrosion. Magnetite scale contains more than 30%. In the composition of rust, it is present in insignificant amounts due to the continuous interaction of the corrosion products among themselves.

Our composition allows us to turn all oxide products and iron salts into magnetite by reducing them with zinc in the medium of the inventive polymer solution, complexing agent and impregnating additives - alcohols. Despite the fact that the restoring properties of finely dispersed zinc powder (dust) are widely known, in the claimed composition, the combination of ingredients provides a new mechanism for the conversion of rust and scale, due to the fact that the used organic complexing agent (tannin and its derivatives, or dioxibenzenes) contribute to the formation of zinc tannates, possessing high reducing properties and electrochemical activity. The recovery process takes place at the interface between rust (and / or scale) and the wet coating layer in the alcohol medium of the neutral region at pH 6.5-8.5 and cathodic polarization of steel in the temperature range from minus 15 to + 40 ° C. Under these conditions, hydroxides, oxides, peroxides of iron are reduced, and its soluble salts (sulfates, chlorides) are transformed into insoluble complex compounds, double or simple hydroxo salts, for example, Fe ₂ [ZnCl ₄ ], Zn ₂ Fe (OH) ₆ Cl ₃ • xH ₂ O and other more complex formulations.

It is known that tannin or its derivatives form chelate complexes with iron compounds. It is also known that most rust stabilizers turn corrosion products into magnetite and that the conversion process depends on the pH and composition of the solution (Kuznetsov Yu.I. // Metal Protection. 2000, Volume 36, No. 2. Shaidurova GI and other coatings , 1999, No. 5, LMC 2002, No. 12, LMC, 2005, No. 12). However, all known compositions using tannin were used to treat iron oxide products in an acidic medium, in which hydrolysis and oxidation processes proceeded in parallel with the reduction. Rust was not stabilized completely, as a result of which part of the hydroxides, sulfates and iron chlorides remained under the coating in its original form. In this case, the corrosion process only slowed down, but did not stop and continued to flow already under the film. The service life of such a coating is naturally not high.

When applying the inventive composition to a steel surface consisting of thick rust and scale, the film-forming agent and a mixture of alcohols provide optimal conditions for the formation of chelate iron complexes, which leads to the formation of a conductive anode coating in a film-forming environment. Magnetite, formed as a result of interactions of the claimed composition with rust and scale, forms a tightly coupled layer that interacts with the treated surface at the level of combination of crystal lattices with the simultaneous formation of an iron-zinc galvanic pair. The resulting coating provides high barrier and protective properties. The inventive composition is a one-component quick-drying in vivo, forming a conductive tread coating that prevents the occurrence of sub-film corrosion. Thanks to the above mechanism, when using the inventive composition, long-term protection is provided for a period of 10-15 years without the use of inkjet surface preparation. Moreover, the inventive primer can be used for surfaces with a rust thickness exceeding 100 microns, while the most effective primers, for example XC-0320 or EP-0199 M, can be used with a rust thickness of not more than 100 microns, and the standard service life is known primers do not exceed 5 years. The primer we declare provides new coating properties by combining barrier, tread and ferromagnetic properties in it. The result obtained from the use of the claimed composition, in terms of duration and effectiveness of protective properties, significantly exceeds the known primers due to the simultaneous achievement of a set of useful properties and a new mechanism of interaction with rust and scale, due to the formation of a layer that is magnetically tightly adhered to the treated surface and resistant to aggressive environments and excluding subfilm corrosion.

The inventive composition can be used as a standalone coating or in complex protection systems in severe environmental conditions and wide operating temperatures from minus 60 to 170 ° C. In addition, the inventive composition can significantly reduce the cost of large-scale repairs and restoration of corroded surfaces of metal structures and equipment in the factory and field conditions, as well as by reducing the cost of preliminary blasting of the surface with thick layers of scale.

The technical result achieved does not explicitly follow from the solutions known in science and technology, which allows us to conclude that the claimed composition meets the criterion of "inventive step".

The proposed composition can be made of components known in the art using known technologies, which allows us to conclude that the claimed solution meets the criterion of "industrial applicability".

The inventive primer composition, characterized by the following ratio of components, wt.%:

film-forming, including: 16-23 - alkyd varnish (calculated on non-volatile residue) 12-15 - synthetic chlorinated rubber 4-8 mixed pigment, including 38-40 - zinc oxide 3.0-4.4 - zinc powder 13.2-17.6 - mica iron 13.5-18.0 filler 1.0-2.0 organic complexing agent 2.0-3.0 mixture of alcohols type C ₂ -C ₄ 3.0-4.0 organic solvent rest

get as follows.

The preparation of the composition is carried out in two stages. At the first stage, a film-forming agent is prepared by mixing in a typical container equipped with a water jacket and a mechanical stirrer with a speed of at least 450 rpm, a solvent, and synthetic chlorinated rubber. The resulting mixture is heated to about 40 ° C and stirred at a constant temperature for about 2 hours until the polymer component is completely dissolved. Then, an alkyd varnish is added to the resulting solution of synthetic chlorinated rubber, which is used as a varnish brand PF-053, and stirred for about 30 minutes. The finished film-forming and other components according to the formulation of the claimed composition are loaded into a ball mill and fray with porcelain balls for about 4 hours, followed by dilution to working viscosity. The finished composition is applied to the corroded surface by the method of pneumatic or airless spraying (it can be applied by brush, roller, dipping). Drying and curing of the coating is carried out at ambient temperature. Coating is carried out over a wide temperature range from minus 15 to + 40 ° C.

The inventive composition is illustrated by examples of specific performance (examples No. 1-No. 3) are shown in table 1.

Characteristics of the properties of previously known primer compositions EP-0199 (control composition) and XC-0320 (composition according to the prototype) are taken from well-known information sources (A.S. Drinberg. “Anticorrosion primers.” St. Petersburg, 2006, p. 92, tab. 39).

For comparative tests, steel samples were used from 08ps steel grade 70 × 150 mm in size, coated with a uniform layer of rust or scale densely adhered to the substrate. The thickness of the rust was 80-150 microns, and the scale of 35-80 microns. Rust was obtained by exposing the samples to atmospheric conditions for 8 months.

Data on the properties of the compositions (examples No. 1-No. 3) and coatings using it are obtained as follows.

The adhesion is checked by the method of trellised notch in accordance with GOST 15140.

The drying time of the primer is verified by the following procedure. On corroded samples and samples with scale at a temperature of 20 (± 2) ° C were applied the compositions according to examples No. 1-No. 3, as well as the control composition and the composition of the prototype were applied. Curing of the applied coatings was carried out at the indicated temperature, the drying time to degree 3 of the coating was determined according to GOST 19007.

Tests for stability in water and aggressive environments, filamentous (subfilm) corrosion and resistance to salt fog was carried out as follows. Comparative tests were carried out in distilled water, 3% solutions of sodium chloride, sea salt, industrial oil, gasoline and salt fog. The tests were subjected to the above samples, which were applied in 2 layers of the claimed compositions according to examples No. 1-No. 3. In similar conditions, the control composition and the composition of the prototype were tested. Resistance to water and aggressive media was determined by immersing corroded samples coated on them in appropriate media (method A, GOSMT 9.403 and visual observation of the state of the coating and its assessment according to GOST 9.407). When assessing the state of the coating, the time of the appearance of signs of destruction of the coating: bubbles, corrosion, peeling and the time of complete destruction of the coating was noted.

Tests for filamentous corrosion and salt spray resistance were performed according to ISO 4623 and ISO 7253.

The results of the tests are presented in table 2 and table 3.

The test results show that coatings prepared from the claimed compounds (examples No. 1-No. 3), in most quality indicators superior to known compositions (control composition and composition of the prototype). The manufacture of compositions in quantitative proportions that do not correspond to the claimed leads to a decrease in impact strength, elasticity and loss of tread properties.

The inventive compositions exhibit unique properties: they provide the possibility of applying not only rust but also scale of different thicknesses to obtain coatings with high impact properties and high drying speed. The resulting coating is characterized by the absence of sub-film corrosion and the presence of tread properties, which determines the service life of the coatings corresponding to zinc-filled coatings deposited on the sandblasted surfaces of non-corroded metal and is at least 10-15 years. The coatings obtained using the inventive compositions allow us to conclude that the problem is solved, i.e. indicate the applicability of the claimed compounds without the use of blast cleaning the surface and can effectively protect the metal surface, including large-sized products, operated in atmospheric conditions of various climatic zones, as well as in an atmosphere containing aggressive gases and vapors, in conditions of high humidity and aqueous environment .

Table 1 Primers according to the invention No. Name of components Case Studies one 2 3 four 5 one Film-forming, including: - alkyd varnish PF-053 with an acidity of not more than 20 mg KOH / g (based on non-volatile) 12.0 13.0 15.0 - synthetic chlorinated rubber PERGUT S20 4.0 5,0 8.0 2 Blend pigment, including: - zinc oxide 3.0 3.8 4.4 - zinc powder 13,2 15.4 17.6 - mica iron 13.5 15.8 18.0 3 Organic complexing agent, namely: - tannin 2.0 - resorcinol 2.5 - catechol 3.0 four A mixture of alcohols, including: -ethanol 0.8 0.9 1,0 - butyl alcohol 0.8 0.9 1,0 - isobutyl alcohol 1.4 1.7 2.0 5 Filler, namely: - talc 2.0 - talc micro 1.3 1,0 6 Xylene oil 47.3 39.7 29.0

table 2 The properties of the claimed primer compositions and coatings based on them The name of indicators Examples of the invention one 2 3 Composition Properties Appearance:
-after long-term storage
- after thorough mixing Opaque gray-red liquid with sediment
Homogeneous suspension of gray-red (eggplant) color Viscosity V3-246 with a nozzle diameter of 4 mm at 20 ± 0.5 ° C, s 40 40 fifty Density, g / cm ³ 1.05 0.20 0.30 Mass fraction of nonvolatile substances,% 44 53.0 63.0 Theoretical consumption for a single-layer coating, g / m ² 120 150 180 Life span, months More than 12 More than 12 More than 12 Coating Properties Color and appearance Eggplant color, smooth, rough Drying time to degree 3 at 20 ± 2 ° C, min 30/30 25/25 20/20 Adhesion to metal, points 1/1 1/1 1/1 Impact Strength, cm 60/70 90/100 90/100 Resistance of the coating at 20 ± 2 ° C to static for 24 hours: WITHOUT CHANGE - water -3% NaCl solution -3% Hcl solution - gasoline - crude oil Resistance with a notch under conditions of elevated temperature (40 ± 5 ° C) and humidity (80 ± 5)% in the presence of traces of NaCl, h 1000/1000 1000/1000 1000/1000 No rust on the scratch,
No thread corrosion Initial coating potential by silver chloride electrode in a 3% NaCl solution, not more than, mV -800 / -800 -890 / -890 -910 / -910

Table 3 Comparative data on the physicochemical characteristics and technological properties of chemically resistant primers - rust converters The name of indicators Primers - rust converters The inventive (examples No. 1-No. 3) EP-0199 (TU 2312-016-2752-4984-2001) XC - 0320 (TU 2303-185-0503-4239-2002) Characteristic of the protected surface: - the presence of rust thickness, microns More than 100 No more than 100 No more than 100 - the presence of a solid black scale thickness, microns Up to 80 Absent Absent - moisture Allowed Allowed Allowed - the presence of oils and old coatings Allowed Not allowed Not allowed Appearance and color of the film Homogeneous inclusions no wrinkles and strangers Russet, eggplant Russet Gray, black, green, etc. Mass fraction of nonvolatile substances,% 45-55 72-78 42-47 Conditional viscosity in B3-4 at 20 ± 5 ° C, s 40-60 30-70 25 Film strength upon impact, cm, not less fifty fifty fifty The degree of milling, microns, not more 40 fifty 45 Film elasticity in bending, mm, not less 2 2 3 Film adhesion, points, no more one one 2 Theoretical consumption per 1 layer, g / m ² 120-140 130-175 100-130 Single-layer coating thickness, microns 40-70 60-80 25-30 Resistance to static exposure to liquids at 20 ° С, h, not less -3% NaCl solution 55 there is no data 24 -5% solution of H ₂ SO ₄ 24 thirty 24 - H ₂ O distilled 170 48 24 The maximum temperature of the coating, ° C -fifteen +5 -10 Electrical properties Conductive tread Lack of conductivity Lack of conductivity Heat resistance of the coating, ° С 130 80 No more than 60

Claims (6)

1. The primer composition for protecting metal surfaces from corrosion, containing a foaming agent, which is used as an alkyd varnish, mixed pigments, a complexing agent, an inorganic filler and an organic solvent, characterized in that the foaming agent additionally contains synthetic chlorinated rubber, a mixture of zinc oxide is used as mixed pigments , zinc and mica iron powder, an organic complexing agent and additionally containing there is a mixture of alcohols of type C ₂ -C ₄ in the following ratio of components, wt.%:
film-forming, including: 16-23 alkyd varnish (based on non-volatile residue) 12-15 synthetic chlorinated rubber 4-8 pigments, including 38-40 zinc oxide 3.0-4.4 zinc powder 13.2-17.6 mica iron 13.5-18.0 filler 1.0-2.0 organic complexing agent 2.0-3.0 a mixture of type C ₂ -C ₄ alcohols 3.0-4.0 organic solvent rest 2. The primer composition for protecting metal surfaces from corrosion according to claim 1, characterized in that, as a mixture of alcohols, a mixture of ethyl alcohol, butyl alcohol and isobutyl alcohol is preferably used at a ratio of 1.0: 1.0: 1.4, respectively. 3. The primer composition for protecting metal surfaces from corrosion according to claim 1, characterized in that tannin and its derivatives are used as an organic complexing agent. 4. The primer composition for protecting metal surfaces from corrosion according to claim 1, characterized in that dioxibenzenes are used as a complexing agent. 5. The primer composition for protecting metal surfaces from corrosion according to claim 1, characterized in that xylene is preferably used as an organic solvent. 6. The primer composition for protecting metal surfaces from corrosion according to claim 1, characterized in that talc is used as a filler.