Method of corrosion protection of metal surfaces

 

(57) Abstract:

The invention relates to a method of protecting metal surfaces of large structures and pipelines. When developing method aims to simplify the process of corrosion protection by increasing the adhesion of the coating material is polyurethane foam, including residual corrosion products on the metal surface. The essence of the method lies in the fact that you are doing the layering of polyurethane foam, in which the polyol as one component of the material applied in the first layer, pre-enter 8 - 10% wt. modified stabilizing rust powder (TU 2310-001-16985624-93), the following protective layers formed by pouring or spraying a polyurethane material selected from a number of hydro-, heat - or teplostojkih its modifications. When implementing the method are provided with a high protective properties of the coating on the rusty metal surface while increasing the structural strength of the product and, if necessary, giving the floor insulation and other properties. table 1.

The invention relates to a method of protecting metal rusty p security (CCS) large-scale structures and pipelines, coating materials (paints) on the basis of various film-forming (guiding material Coating paint for corrosion protection of internal surfaces of steel tanks", CSRL, Goskompriroda, , Astrakhan, 1985). However, in some cases, the requirements of the CCS will deliver a performance that do not have coverage of coatings, such as thermal insulation properties and increase the structural strength of the products.

The known method of surface protection, including surface preparation, spraying or pouring polyurethane foam. If necessary, you can apply an additional protective coating (G. A. Bulatov "Polyurethanes in modern technology) engineering, 1983, S. 170 171).

However, this method involves a preliminary thorough surface treatment that increases the cost and complicates its implementation.

Solved the problem in the development of the proposed method is to simplify the process of CCS by increasing the adhesion of the coating material, including residual corrosion products on the metal surface.

When implementing the proposed method provides high protective properties of the coating on the rusty metal surface while increasing the structural strength of the product and, if necessary, make the coating insulating and other properties.

With the fact a coating of polyurethane foam by the method of filling or layer-by-layer deposition, according to the invention, a pre-applied layer of the composition of the polyurethane, polyol as one component which is injected 8 10 wt. modified stabilizing rust powder (TU 2310-001-16985624-93), then subsequent form protective layers from the original polyurethane composition, selected from a number of hydro-, heat - or teplostojkih modifications.

This additive containing the first layer of polyurethane coatings, not only stabilizes the rust, but showing a surface-active action contributes to the increase in the content of closed pores and their uniform distribution in the volume of this layer. In addition, multifunctional additives (contains phenolic hydroxyl, quinoid and ether groups) significantly increases the adhesion of the polyurethane to rusty surfaces.

The method is as follows.

The metal surface of the tank, made of steel grade St-3, mechanically cleaned from mud, reservoir and loose rust to the thickness plotopteridae rust of not more than 100 μm, then degrease the petrol BR or white spirit.

Usually use polyurethane foam, consisting of two components And the ponent And previously administered 8 10 wt. modified stabilizing rust powder (SMEs) (TU 2210-001-16985624-93), which is a polyfunctional stabilizing rust additive with pH>7, which is a modification of powder carolynne (TU 64.11.05-87) in the form of heavy byproduct of the chemical processing of vegetable raw materials, which in the process of oxidative and hydrolytic degradation and processing amines turns into a polyfunctional reactive mixture oligosaline molecular weight of from 5000 to 15000 srvc. units appearance SMEs: free flowing fine powder dark brown color with low specific smell. Granulometric composition of at least 95 wt. submitted by particles of 10 to 15 μm, the specific gravity of 0.4 to 0.5 g/m3the moisture content is not more than 5 wt.

After thorough mixing, the SME component And put the first protective layer together with the component B of polyurethane foam using installation Foam. The layer thickness of up to 0.5 cm in 10 to 15 minutes put successively the following layers selected brand polyurethane foam without adding SMEs to achieve the optimal thickness of the protective coating of 1.5 30 cm or perform the fill.

The table presents the specific formulations of panopolis erosional protection of metal surfaces by applying coatings of polyurethane foam-based polyol and MDI pouring or spraying, wherein the pre-to the surface put a layer of polyurethane foam, polyol as one component of which enter 8 10 wt. modified stabilizing rust powder, used polyurethane foam selected from the group including hydro-, heat - or teplostojka its modifications.

 

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