JPS5855287B2 - Corrosion prevention method for L-shaped steel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a corrosion protection method for L-shaped steel that can simply and reliably protect the L-shaped steel and maintain corrosion protection for a long period of time.

To explain with reference to the drawings, first anti-corrosion tapes 4, 4 are applied from both front edges 2, 2 of the L-shaped steel 1 to the inner corner 3, and then from both back edges 5, 5 to the bent corner. After pasting the second anti-corrosion tape 7 over the corner surface parts 6, 6, the third anti-corrosion tape 8 is pasted to form both edge overlapped parts 9, 9 and the center surface overlapped part 10, and then This relates to a method for preventing corrosion of an L-shaped steel, which is characterized in that a fourth anticorrosion tape 11 is attached to the inner corner 3 of the L-shaped steel to form a center back surface overlapped part 12.

Incidentally, reference numeral 13 denotes a glue-like undercoat, and before applying the undercoat 13, the surface of the L-shaped steel is polished with a wire brush and moisture is wiped off.

The width of the first, second, third, and fourth anti-corrosion tapes is determined according to the location where they are to be pasted, and they are pasted while being pulled strongly, and they are made of strong synthetic fibers such as nylon. A tape cloth 16 is formed by sewing several sewing threads 15 made of strong synthetic fibers such as nylon in the longitudinal direction of the non-woven fabric tape 14 made of the same material. Inert silica is mixed, and a small amount of tannin and a rust inhibitor are mixed and stirred to form a penetrating layer 18, which is then penetrated with a dirt-like adhesive 17 to form a penetrating layer 18. It is formed by providing an adhesive layer 19 on the front and back surfaces, and according to experiments, the tape cloth 16
It is preferable to use a mixture containing about 8 parts of petrolatum, about 60% of petrolatum, about 30 parts of inert silica, tannin and a rust inhibitor in a small volume ratio. The viscosity is reduced to make it easier to apply by increasing the amount of inert silica used as a hardening agent.

Also, from the state shown in FIG. 3, it is smoothed as shown in FIG. 4 to ensure adhesion.

In addition, by impregnating the cloth tape 16 with a clay-like adhesive 17 to form a permeation layer 18 and providing adhesive layers 19 on both ends and the front and back surfaces of the permeation layer 18, the adhesive layer 19 is sufficiently applied to the cloth tape 16. The adhesive layer 19 is adhered to make the coating work smooth, and since the adhesive layer 19 is made of petrolatum as a main component, it does not evaporate or harden semi-permanently and always maintains viscosity to form an anti-corrosive layer, thereby preventing harmful effects caused by surface corrosion. In addition, because it contains a rust inhibitor, it changes red rust to black rust.
Suppresses the progression of rust.

In addition, by incorporating inert silica, the adhesive has a clay-like viscosity that does not change, and it always maintains a viscous adhesion to the surface and will not peel off from the surface due to vibrations, shocks, etc. It does not allow moisture or air to enter into the gaps, and it maintains its viscosity semi-permanently and can adhere tightly.

In addition, by mixing a small amount of tannin, the adhesive 17 forms a hard, dense film of iron tannate on the metal surface, and this film prevents the progress of rust, and together with the anticorrosion effect of petrolatum, prevents the progress of rust. In addition, the adhesive layer 19 has acid resistance, alkali resistance, salt resistance, and excellent chemical resistance.

The present invention has the above-mentioned configuration, and the first anti-corrosion tape 4 is applied from both surface edges 2 and 2 of the L-beam 1 to the inner corner 3.
・Furthermore, a second anti-corrosion tape 7 is applied from both edges 55 of the back side to the bent corner surface parts 6, 6, and then a third anti-corrosion tape 8 is applied to tighten both edges. The contact parts 9, 9 and the central surface overlap part 10 are formed, and then the fourth part is formed around the inner corner part 3.
In this example, the L-shaped steel is coated reliably by attaching anti-corrosion strip tape 11 and forming a central back overlapped portion 12.

Furthermore, it is extremely economical as it provides corrosion protection over a long period of time, and the construction method is simple and workability is favorable, resulting in a reduction in labor costs.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway perspective view, Figure 2 is a sectional view, Figures 3 and 4 are explanatory diagrams of the construction method, Figure 5 is a partially cutaway plan view of the anti-corrosion tape, and Figure 6 is the anti-corrosion tape. FIG. DESCRIPTION OF SYMBOLS 1...L-shaped steel, 2...Both edges of the surface, 3...Inner corner portion, 4...First anti-corrosion tape, 5...Both edges of the back surface, 6...Folding Curved corner surface portion, 7...Second anticorrosion tape, 8...Third anticorrosion tape, 9...Both edges overlapped portion, 1
0...Central surface overlapped part, 11...Fourth anticorrosion tape, 12...Central back overlapped part, 13...Undercoat, 14
... Non-woven tape, 15 ... Sewing thread, 16 ... Tape cloth, 17 ... Adhesive, 18 ... Penetration layer, 19 ...
・Adhesive layer.

Claims (1)

[Claims] 1 Paste the first anti-corrosion tapes 4, 4 from both front edges 2, 2 of the L-shaped steel 1 to the inner corner 3, and then apply the first anti-corrosion tapes 4, 4 to the inner corners 3, and
・After pasting the second anti-corrosion tape 7 over the bent corner surface parts 6 and 6 from 5, the third anti-corrosion tape 8 is pasted to form both edge overlapped parts 9 and the center surface overlapped part. 10, and then attaching a fourth anti-corrosion tape 11 around the inner corner portion 3 to form a center back overlapped portion 12.