Anti-corrosive coat with carbon nano-tubes filled with zinc

FIELD: single-layer and multi-layer priming coats for corrosion protection of metalwork subjected to action of aggressive media.

SUBSTANCE: proposed single-layer coat is made from paint-and-varnish material on base of film-forming agent containing carbon nano-tubes filled with zinc. Multi-layer coat, 90-240 mcm thick, includes priming layer , 40-100 mcm thick and covering layer. Priming and intermediate layers are made from paint-and-varnish material on base of film-forming agent containing 40-86% of carbon nano-tubes filled with zinc. Covering layer is made from paint-and-varnish material containing the carbon nano-tubes which are not filled with zinc.

EFFECT: enhanced resistance to aggressive medium; increased service life of coat.

3 cl, 2 dwg, 8 ex

 

The invention relates to coatings for corrosion protection of metal structures and can be used for all metal products exposed to aggressive environments.

Known aqueous composition for coating containing 5 to 95 wt.%, at least one nabukelevu in the alkali type polymer core-shell and 95-5 wt.%, at least one of polyurethane, and the sum of the wt.%, specified for polymers, always amounts to 100 wt.%, where Nauheim in alkali-type polymer core-shell copolymer is obtained in two or more stages of emulsion polymerization and obtained by copolymerization in the first stage (see RF patent №2254351, IPC 09D 175/04).

The lack of water composition is the occurrence of corrosion of metal structures under the coating layer, resulting from the use of water composition and alkali.

Also known aqueous epoxy corrosion resistant primer containing aqueous epoxy compound, curing agent and bichromatic inhibiting corrosion of the pigment (see patent RU No. 2003134603, IPC 09D 151/00, 09D 5/02).

The disadvantage of this technical solution is the occurrence of corrosion of metal structures under the coating layer, resulting from the use of water epoxy compound and its propensity to Rastrelli aniu the temperature drops.

Known multi-layer anticorrosion metallic coating consisting of a primer comprising at least two layers formed from a material containing fine powder of zinc in the environment orhangazispor thermoplastic binder, and then applying at least one coating layer (see RF patent №2155784, IPC SS 28/00).

A disadvantage of the known paint material is a low resistance to aggressive environment and service life corrosion protection does not exceed 5-7 years.

Closest to the proposed technical solution is based coating containing a film-forming substance and carbon nanotubes (see JP patent 2005068278 And 17.03.2005).

A disadvantage of the known paint material is a low resistance to aggressive environment and service life corrosion protection does not exceed 5 years.

The present invention is to improve the effectiveness of the corrosion protection of steel structures for long life with increased service life of corrosion-resistant coating of metal structures by creating on the surface of the coating uniform electric potential equal to the potential of the protected metal construction, and implementation on the additional cathodic protection.

This object is achieved in that in the corrosion-resistant primer coating for protection of steel structures made of paint material based on film-forming carbon nanotube, according to the invention the coating contains from 40 to 86% of the volume of carbon nanotubes filled with zinc.

Multi-layer anti-corrosion coating to protect the metal-containing primer layer, intermediate layer and surface layer, according to the invention contains a primer layer on the carbon nanotubes filled with zinc in an amount of from 40 to 86% of the volume and thickness of 40-100 μm, the intermediate layer is a primer layer containing carbon nanotubes filled with zinc in amounts of from 40 to 86% of the volume, and thickness of 70-90 microns, and a surface layer made of a paint and varnish material containing carbon nanotubes, not filled with zinc and a total thickness of multi-layer anti-corrosion coating 90-240V microns.

Introduction inside carbon nanotubes zinc allows to obtain zinc cylinders with a constant diameter. It is provided with calibrated holes inside carbon nanotubes. Introduction inside carbon nanotubes zinc also provides additional cathodic protection of steel structures with stable Phi is ICO-chemical properties, since the damage of a paint material reaching the surface of the metal, the formation of galvanic couples zinc - iron. While the iron begins to corrosivity only after all zinc is oxidized. The conductivity of the film-forming substances not only helps to protect the metal, but also provides drainage of static charges from the surface of the paint material, providing greater safety of the structure.

The number of carbon nanotubes, comprising from 40 to 86% of the volume of paint material, ensures high durability paint material, which is especially important for the formation of the surface layer. With these parameters the destruction process continues long enough - a few tens of years.

Stable physico-chemical properties of the coating are provided with a thin grooved channels in carbon nanotubes filled with zinc.

The length of the nanotubes ranges from tens to hundreds of microns and a diameter of from 20 to 50 nm. The amount of zinc in the nanotubes depends on their length and diameter as the internal volume of the nanotube is filled completely, and the filling of nanotubes based on the phenomenon of capillary retracting liquid substances, in this case the molten metal (see Avelizy Success Fizicheskaya, 2004, t, s). To obtain the same physico-chemical properties should only use nanotubes with a small variation in diameter.

Carbon nanotubes as one-dimensional carbon material were opened about 10 years ago. A new molecular form of carbon discovered a whole series of new and unexpected physical, mechanical and chemical properties. These unique properties have made nanotubes key element of nanotechnology.

Nanotubes currently mainly used in the fabrication of molecular electronic devices, nanotransistors and memory elements. Due to the unique mechanical properties of nanotubes can also produce carbon composites extraordinary strength for the automotive and aerospace industries.

Carbon nanotubes have about 100 times more rigid than steel, with six times lower density, while the electric current.

The carbon frame is a large molecule composed entirely of carbon atoms. You can even say that the carbon frame is a new allotropic form of carbon (in addition to the long known: that of diamond and graphite). The main feature of these molecules is their frame shape: they look like closed, empty inside "shell", for example holleran 60(figa), after it was developed a method of obtaining fullerenes in macroscopic quantities, found many other, both lighter and heavier fullerenes, starting from s20(minimum of fullerenes) and to p70C82With96and above (some of them shown in figure 1).

1 Some members of the family of fullerenes: a) C60b) C60c) C80

Have also been found long cylindrical carbon formation, called nanotubes (figure 2).

Figure 2 Examples of nanotubes

Nanotubes can be large and small, single and multi-layer, direct (figa, b), and spiral (pigv) (see Pan et al, "Very long carbon nanotubes". Nature 394 (1998) 631.). Despite the apparent fragility, and even delicacy, nanotubes proved to be extremely durable material as tensile and Flexural strength.

As the results of experiments and numerical simulations, the young's modulus of single-walled nanotubes reaches values of the order of 1-5 TPA, which is an order of magnitude greater than that of steel. Currently, the maximum length of the nanotubes ranges from tens to hundreds of microns and a diameter of from 20 to 50 nm. To solve this problem you can use and longer nanotubes, and the diameter has no C is achene, although nanotubes with the same diameter to provide a more stable physical and chemical properties.

In recent years, dramatically increased the interest in and study of filled carbon nanotubes. One of the main directions of filling nanotubes with metals: Fe, Ni, Co, and so on, which allows you to create materials with unique magnetic properties (see Finger, 2003, 10, VIP).

For filling carbon nanotubes using different approaches, discussed in detail in the review (Avelizy success of the physical Sciences, 2004, t, s). For over ten years, used a method based on the phenomenon of capillary retracting liquid substances, in this case the molten metal.

In nanotubes can not only "push" the atoms and molecules individually, but literally "pour" substance. As the experiments showed, the open nanotube has capillary properties, that is, it draws the substance. Thus, the nanotubes can be used as microscopic containers.

As film-forming substances can be used any materials used to protect metal structures from corrosion by a method of staining (see, for example, STF 001-95, Protection of metal constructions of bridges from corrosion by a method of dyeing Corporation "Transstroy", Moscow, 1995), while more is that introduction of carbon nanotubes, filled with zinc, does not affect processes in the coating and the durability of any paint coating will increase. In addition, this will occur for any coating, including a single layer. However, single-layer coatings are considered to date are not promising and are used only for temporary protection during transportation of the unit to the place of installation.

After that nanotubes are added to the binders, mixed and applied to the protected surface. Further layers are applied after hardening of the previous layer.

Before applying the first (primer) layer, are carried out cleaning of the metal from rust (if it is present) and degreasing. These operations should be performed in accordance with the STF 001-95, Protection of metal constructions of bridges from corrosion by a method of dyeing Corporation "Transstroy", Moscow, 1995) or other normative documents.

The most suitable in moderate conditions to use in the surface layer of carbon nanotubes without filling zinc as sacrificial protection will occur only after the destruction of the surface layer.

New in the proposed solution is the use of new materials and technologies, which recently started to be applied in microelectron the th industry to create a cheap and fast processors. The application of carbon nanotubes filled with zinc, in the paint industry can not only reduce the cost of production of corrosion-resistant materials, but also to increase the duration of maintenance-free operation up to 30-35 years. The use of carbon nanotubes filled with zinc, can achieve optimal results with minimal cost.

The advantages of the new paint coating for protection of metal constructions are illustrated by table representing different systems coatings to protect metal structures from corrosion, in which the film-forming substance is polyurethane (TU 84-404-78) with different amounts of carbon nanotubes and carbon nanotubes with zinc for different operating conditions.

Table
Primer paint layerIntermediate paint layerTop coat Quantity: nanotube / nanotube with Zn in volume. %The approximate thickness of the entire coating, mcmLife coverage
Quantity: nanotubes with Zn in volume. %Estimated layer thickness µm Quantity: nanotubes with Zn in volume. %Estimated layer thickness, micronsN1F1
1. 8680-1008670-9086/no220-2403530
2. 8680-1008670-9060/no220-2403328
3. 8680-100no70-9086/no220-2401614
4. 8680-1008670-9080/no190-2202522
5. 6040-506070-9040/no190-2401817
6. 6040-50no70-9080/no190-2201210
7. no80-100no70-90no/no190-24054
8. 8690-120nonono90-12098
Note: N1 - mind is provided for the climate; F1 - cold climate.

1. Anti-corrosion primer coating for protection of steel structures made of paint material based on film-forming and containing carbon nanotubes, characterized in that the coating contains carbon nanotubes filled with zinc.

2. Anti-corrosion primer coating according to claim 1, characterized in that the coating contains from 40 to 86 vol.% carbon nanotubes filled with zinc.

3. Multi-layer anti-corrosion coating to protect the metal-containing primer layer, intermediate layer and surface layer, characterized in that it contains a primer layer according to claims 1 and 2 of a thickness of 40-100 μm, the intermediate layer is a primer layer according to claims 1 and 2 of a thickness of 70-90 microns, and a surface layer made of a paint and varnish material containing carbon nanotubes, not filled with zinc, and with a total thickness of 90-240V microns.



 

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14 cl, 7 tbl

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2 tbl, 9 ex

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3 cl, 2 tbl, 5 ex

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2 tbl

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2 tbl, 5 ex

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1 tbl, 2 ex

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3 tbl

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2 tbl, 2 ex

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