JPH0120231B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a corrosion-proof structure for steel structures such as machinery, metal pipes, piping joints, and tanks.

Corrosion prevention methods for steel structures include coating them with an anticorrosion substance containing petrolatum as a main component, or wrapping or covering them with an anticorrosion tape or sheet made by impregnating and applying the substance to a porous tape base material. method is known.

However, while these substances are excellent as anti-corrosion materials because they remain viscous for a long time, on the other hand, dirt, dust, etc. may adhere to their surfaces, resulting in significant damage to their appearance, and due to their viscosity, they may be exposed to external damage. In addition, there is a disadvantage that steel structures can be damaged by the impact of steel structures, such as when exposed to high temperatures of 130°C or higher, or when fluids at 130°C or higher pass through steel structures, such as metal pipes. When the surface is exposed to high temperatures, petrolatum drips and the anti-corrosion layer becomes thinner, reducing the anti-corrosion effect.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an anti-corrosion structure having a hardened layer on the outermost surface that is substantially non-adhesive and has physical strength, and does not drip even at high temperatures.

This object of the present invention is achieved by forming an anticorrosion layer on the surface of a steel structure, and providing a hardened layer made of grease or a viscous substance containing grease on the surface of the layer.

According to the present invention, since a non-adhesive hardened layer is formed as the outermost layer, the appearance is beautiful because dust and the like will not adhere to it, and it will not be damaged by external impact or exposed to high temperatures. It has the characteristic of having excellent anticorrosion effects over a long period of time because it does not drip under the surface.

The anticorrosion layer formed on the surface of a steel structure can be formed by applying a petrolatum mixture consisting of petrolatum, oxidized wax, tannin, inert silica, rust preventive, etc. to the surface of the steel structure. However, for example, a porous sheet such as a woven fabric (or non-woven fabric) made of synthetic resin such as polyester or nylon, a glass fiber cloth (or non-woven fabric), or a foam sheet is impregnated with the petrolatum mixture and applied to an anticorrosion tape or a porous sheet such as a foam sheet. It may be constructed as a sheet by wrapping or wrapping it around the surface of a steel structure.

Grease or a viscous substance containing grease is applied to the surface of the anticorrosion layer constructed in this way to a thickness of about 0.1 to
The grease is coated with a thickness of 5 mm, or it is impregnated and coated on a porous tape as described above, wrapped or wrapped, and heated using a heat source such as a burner to harden the grease to form a hardened layer. The heat source used to cure the grease may be, for example, the heat of a hot fluid passing through the steel structure.

The grease used in the present invention is a commonly known grease composed of mineral oil and metal soap, but it is preferable that the metal soap is made of an inorganic material such as sodium, barium, or lithium. It is also possible to use one using an organic metal set. Although it varies depending on the type of grease, in general, when grease is heated above 70°C, the dispersion effect of the metal particles in the grease is lost, and the mineral oil component hardens through an oxidation reaction, making it virtually non-stick. It forms a layer.

However, if the area where the anti-corrosion structure is constructed is located near a passageway and is frequently exposed to external impacts, an appropriate amount of non-hardening low molecular weight material may be added in order to impart elasticity to the hardened layer. It is preferable to use a viscous substance that is blended with grease. As low-molecular substances, it is preferable to use petrolatum, liquid rubbers, oligomers, etc., which have a molecular weight of 10,000 or less and are liquid or paste-like at room temperature, and these low-molecular substances can be blended up to 90% by weight. be. Note that appropriate amounts of known compounding agents such as fillers, pigments, and rust preventives can be added to the grease or the viscous substance containing the grease.

As mentioned above, the anti-corrosion structure of the present invention is obtained by coating the surface of a steel structure with a petrolatum mixture having anti-corrosion properties, or coating and impregnating a porous sheet with the mixture to form an anti-corrosion tape or sheet. It is constructed by wrapping or wrapping to form an anticorrosion layer, and then applying grease or a viscous substance containing grease thereon in the same manner, wrapping or wrapping, and heating. A grease layer or a viscous substance layer containing grease is formed on one surface of the anticorrosive tape or sheet, or a hardened layer tape or sheet is prepared by coating and impregnating a porous sheet with grease or the viscous substance. It is easy to wrap or cover the surface of a steel structure with the above-mentioned anti-corrosion tape or sheet and then heat it, as the anti-corrosion process only needs to be done once, and it also provides uniform anti-corrosion. It has the feature of being able to configure a structure.

As described above, the anticorrosion structure of the present invention has a substantially non-adhesive hardened layer on the surface of the anticorrosion layer, so it has a beautiful appearance, excellent impact resistance, and can be used for a long time by preventing the anticorrosion layer from sagging. It has the characteristic that good anticorrosion effects can be obtained throughout.

Next, a typical example of the present invention will be shown.

A polyester non-woven fabric was impregnated with the petrolacum mixture mentioned above, and one side of the fabric was coated with grease to a thickness of 1 mm to make a 50 mm wide anti-corrosion tape, which was half overlapped on the surface of a metal pipe to create a spiral shape. It was wrapped and placed in a hot air circulation dryer maintained at 130°C for 24 hours to harden the grease layer.

The surface hardness of the surface of this sample (grease hardening layer) was measured with a Shower J hardness tester and was 80, and the Dupont impact strength test (center of impact diameter 12 mm, unloading load
300 g, drop height 10 cm), no damage to the hardened layer was observed.

For comparison, we tested a product without applying grease, and the Shower J hardness was 21, and a lot of damage was seen in the Dupont impact strength test.

Claims (1)

[Claims] 1. An anti-corrosion structure characterized in that an anti-corrosion layer is formed on the surface of a steel structure, and a hardened layer made of grease or a viscous substance containing grease is formed on the layer surface.