CS220229B1 - A method of providing corrosion protection to a surface of carbon or low alloy steel - Google Patents

Abstract

A method of creating anti-corrosion protection for the surface of carbon or low-alloy steels, carried out by providing the steel surface with a coating formed by sintering glass powders and applying an organic-mineral coating based on cement and casein. The method is suitable for protecting, in particular, reinforcing elements in concrete or steel structures. In order to achieve a higher aesthetic effect, it is possible to apply another coating of one or more layers of varnish, enamel or paint, or on a previously applied primer.

Description

The invention solves long-term corrosion protection of carbon or low-alloy steel surfaces.

Products made of carbon or low-alloy steels are coated with surface protection coatings on an organic or inorganic basis. The type of protective coating is chosen taking into account the technical, aesthetic and economic requirements. The disadvantage of most coatings used is the relatively short lifetime in corrosive compositions, which adversely affects operation, labor, cost and sometimes, due to inaccessibility, it is impracticable to repair or renew these coatings. If the protective coatings are not repaired in a timely manner, corrosion loss of steel occurs and the products of the steel lose their function prematurely.

According to the present invention, a method for forming corrosion protection of carbon or low-alloy steels with long-term protective efficacy is to provide a corrosion-resistant coating of cement-casein-based paint on a carbon or low-alloy steel coated with an anti-corrosion coating.

In order to achieve a higher desirable aesthetic effect and possibly provide protection against the sun-enh-organo-mineral coating of cement-casein, a further coating of one or more layers of lacquer, enamel or paint is applied on the organic, inorganic or organic-inorganic base, First penetration coating is applied.

The base coat formed by sintering the glass powders has a high cohesion with the steel and protects them from corrosion as it is chemically bonded to the iron contained in the surface layer of the steel. It is thermally stable even at higher temperatures than atmospheric. It has high electrical resistance. It forms a thin layer and is porous.

The top anticorrosive coating of cement-casein-based paint forms a semi-permeable membrane that captures and neutralizes corrosion-promoting and corrosive-promoting substances. Its cement crystals grow through the pores of the substrate, completely filling them, creating a perfect cover for the protected surface. The pores of the cement-casein coating gradually fill with neutralized substances, the coating becomes impermeable and has a long service life.

The benefit of the invention, while maintaining the separate protective function of each coating, is separately the interaction of the two types of surface corrosion protection. The chemical bonding of the primer with the corrosion-resistant element of iron contained in the protected steel surface and the perfect filling and penetration of the pores of the primer with a top organic-mineral coating based on cement and casein form a highly effective long-term corrosion protection of carbon and low alloy steels. the combination of two types of coatings and the protective function of steels against high temperatures.

The method of protection of steels according to the invention is currently in the stage of verification tests. .

Example 1

Class 17 stainless steels are used in the perimeter walls of building structures where there is a danger / corrosion of carbon steels. Replacement of used stainless steel class 17 (eg 17041, 17246) uses class 10 or 11 steel (eg 10216, 11373) , the surface of which is provided with an anticorrosive protective coating formed by sintering the glass powders according to U.S. Pat. No. AO. 200 360. The treated reinforcing steel, in the form of already formed reinforcing elements, with a surface free of dirt and grease, is applied by hand painting or by machine spraying or dipping, anticorrosive organic- mineral paint based on cement and casein according to MS. U.S. Pat. No. 139 249, in at least two layers, the minimum thickness of which is approximately 150 μτη, ie the total minimum coating thickness is 300 μτη. Before applying another layer, the previous layer must be completely dried.

The coating thickness of 100 to 200 μΐη is dried at a temperature of 20 ° C and a relative humidity of 50 to 70% for about 1 to 2 hours.

Thus, corrosion-protected carbon steels can perform the same function in a given environment as corrosion-resistant steels of class 17.

This will save valuable raw materials imported from abroad for the production of anti-corrosion steels, especially chromium and nickel, and will save electrical nergy in the production of anti-corrosion steels (electrical steel).

The method of protection of steels according to the invention can be used in particular in the field of construction for the protection of reinforcement, structures and the like and is particularly advantageous for places that are inaccessible for protection by conventional methods.

Claims (2)

Subject CLAIMS 1. A method for forming a corrosion protection surface of carbon or low-alloy steels, characterized in that a corrosion-resistant organic-mineral coating based on cement and casein is applied to the surface of carbon or low-alloy steels provided with an anticorrosive coating formed by sintering glass powders. 2. A method of providing anticorrosive protection of the surface of carbon or low-alloy ynAlez steels according to claim 1, characterized in that in order to achieve a higher desirable aesthetic effect and optionally to provide protection against sunlight of an organic mineral cement-casein coating, paint, enamel or paint on an organic, inorganic or organic-inorganic base, or, if necessary, a penetration coating is first applied before the coating is applied.