Ground-inhibitor for corrosion protection of aluminum alloys

 

(57) Abstract:

Usage: to protect metals from corrosion. The inventive ground-inhibitor for corrosion protection of aluminum alloys contains prefabricated-based epoxy primer EP-076 85,0 is 91.5 %, hardener - 50% solution in an organic solvent fluorinated oligomer product of the interaction of polyethylenepolyamine, toluylene diisocyanate, cyclohexanone and activterminator alcohol of molecular weight of 700-850 8 - 14 %, inhibitor-chromate of cyclohexylamine of 0.5 - 1.0 %. The ground-inhibitor allows to obtain coatings with high corrosion resistance to aggressive environments (adhesion through the night in 3 % NaCl at 50oWith 1 point in 15 days 3 % CH3COOH 2 points) and high adhesive strength to the substrate alloy D-16. 3 table.

The invention relates to the protection of metals from corrosion and can be used in aircraft construction, mechanical engineering other industries for corrosion protection of aluminum and its alloys.

Known soil VL-05 phosphating systems paint anti-corrosive coatings containing as one component of phosphoric acid as passivator (Lacor the frame ground is it applies only to the processing of steel products and are not suitable for non-ferrous metals.

Closest to the invention is ground EP-076 (TU 6-10-755-74) containing a solution of epoxy resin, pigments, fillers and curing hardener N 2 a solution of polyamide resin (TU 6-10-1279-72) applying the lacquer coating systems for protection of aluminum and its alloys from corrosion (coating materials. Technical requirements and quality control, M Chemistry, so 2, S. 103 104).

The disadvantages of the known soil are insufficient adhesion to aluminium and its alloys, the impossibility of curing under conditions of high humidity and insufficient corrosion resistance of coatings based on it.

The invention consists in the use of fluorine-containing oligomer OF 2 ketimine based polyethylenepolyamine, toluylenediisocyanate, cyclohexanone and octocorallia alcohol together with chromate of cyclohexylamine as epoxy hardener component prefabricated soil EP-076, or another epoxy paint material, allowing to obtain inhibited ground cover capable of curing under conditions of high otnositsea adhesive strength of the primer to the substrate, that allows to obtain coatings with a high degree of corrosion protection and extended service life. Adding to the epoxy prefabricated soil EP-076 solution of fluorine-containing oligomer OF 2 in combination with an inhibitor of corrosion of aluminum chromate of cyclohexylamine allows to combine in one production step process of surface treatment of coated products of aluminium and its alloys and the application of the primer.

To improve the adhesion properties of the coating, increasing its corrosion resistance, it can be cured under conditions of high relative humidity and low temperatures, soil-inhibitor for corrosion protection of aluminum alloys containing prefabricated base epoxy primer EP-076 and the hardener further comprises a fluorine-containing oligomer OF 2 molecular weight 700 850 and as chromate inhibitor of cyclohexylamine in the following ratio, wt.

Epoxy prefabricated Foundation primer EP-076 85 91,5

Fluorine-containing oligomer OF 2 (50-cent solution) 8 14

Chromate of cyclohexylamine 0,5 1,0

The epoxy component is mixed with hardener-promoter adhesion OF 2 to ground inhibitor by the method of the pneumatic spraying dilution of the mixture components to working viscosity 12 15 with the viscometer VZ-4 with a mixture of solvents acids: ethylcellosolve 9: 1 by weight, or diluent R-5. The ground-inhibitor is applied in two layers with an interval between the layers 2 to 3 hours, with 18 of the 22oC. following Layers in the system paints and varnishes can be applied to the 2nd layer of soil-inhibitor after 3 to 5 h after application at a temperature of 18 - 22oC. When applied under conditions of high relative humidity and low to 0oWith temperature, the time interval should be increased to 20 h of exposure prior to application of subsequent layers.

The invention is illustrated by the following examples (wt.)

P R I m e R 1.

Prefabricated soil EP-076 85

Fluorine-containing oligomer OF 2 (50%) 14

Chromate of cyclohexylamine 1,0

Fluorine-containing oligomer OF 2 is introduced into the HF-based primer EP-076, thoroughly mixed, injected chromate of cyclohexylamine, stirred to dissolve, dilute with solvent P-5 to a viscosity of 14 with the viscometer VZ-4, filtered, maintain 30 to 40 min to remove air bubbles and put on the prepared surface with a spray gun KR-4.

P R I m m e R 2.

Prefabricated soil EP-076 90

Fluorine-containing oligomer OF 2 (50 cent) 9,3

Chromate of cyclohexylamine 0,7

Cooking and caused Rashi oligomer OF 2 (50 cent) 8,0

Chromate of cyclohexylamine 0,5

Preparation and application of ground-inhibitor analogously to example 1.

Fluorine-containing oligomer OF 2 is introduced into the HF-based primer EP-076, thoroughly mixed, injected chromate of cyclohexylamine, stirred to dissolve, dilute with solvent P-5 to a viscosity of 14 with the viscometer VZ-4, filtered, maintain 30 to 40 min to remove air bubbles and put on the prepared surface with a spray gun KR-4.

We investigated the adhesion properties of the soil-inhibitor in comparison with serial primer EP-076, utverzhdennym hardener N 2. The results are given in table. 1.

As can be seen from the table. 1, the ground-inhibitor provides greater strength of the adhesive bond of the coating layer with the substrate alloy D-16 in comparison with the serial EP-076.

We investigated anti-corrosion properties of coatings of different coating materials applied to the samples of alloy D-16 serial ground EP-076 and ground-inhibitor. The results of the tests are presented in table. 2. As can be seen from table 2, soil-inhibitor allows to obtain coatings, highly corrosive ustoichivosti even in the penetration of aggressive environment under the floor.

We investigated the ability of soil-inhibitor dried in high humidity conditions, for which the samples of alloy D-16, stained soil-inhibitor and serial ground EP-076 was placed in hydrostat with 100-Noah relative humidity 10oC.

The results are given in table. 3.

As can be seen from the data table. 3, the ground-inhibitor capable of forming high-quality coverage even under adverse conditions of high relative humidity, low temperature and high curing under these conditions, what application serial primer EP-076 with hardener N 2 in such conditions does not provide.

By reducing or increasing the content OF 2 and chromate of cyclohexylamine (HCA) in the composition compared to the specified limits of the reduced inhibitory effect, and for completeness of the curing soil-inhibitor that negatively affects the coating properties, primarily, on its adhesion to the substrate.

Test results can be concluded about the significant superiority in its properties of soil-inhibitor over serial primer EP-076 with hardener # 2. Use as hardener-promoter adhesion ftorsoderzhashchim a prefabricated ground EP-076 provides the ability to get ground-inhibitor, capable of curing under conditions of high relative humidity, provide high adhesion to aluminum and its alloys and enhanced corrosion resistance of protective coatings based on it. In addition, using the proposed achieved simplify the process by combining the operation inhibition of the surface of the product and its color in one production step. In addition, dramatically increases the viability of the material (8 to 10 times).

Ground-inhibitor for corrosion protection of aluminum alloys containing prefabricated base epoxy primer EP-076 and curing agent, characterized in that it contains as a hardener 50% solution in an organic solvent fluorinated oligomer product of the interaction of polyethylenepolyamine, toluylene diisocyanate, cyclohexanone and octocorallia alcohol of molecular weight of 700 to 850, and optionally, a chromate inhibitor of cyclohexylamine in the following ratio, wt.

Epoxy prefabricated Foundation primer EP-076 85,0-91,5

50% solution in an organic solvent fluorinated oligomer 8-14

Chromate of cyclohexylamine 0,5-1,0

 

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