JP3400159B2 - Heavy corrosion protection coated steel - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heavy duty anticorrosion coated steel material which is mainly used as a steel material for civil engineering such as heavy duty anticorrosion piles and heavy duty steel sheet piles in a marine environment. 2. Description of the Related Art Heavy corrosion-resistant coated steel materials having an organic coating such as polyurethane and polyethylene are very stable and excellent in environmental barrier properties in various aqueous solution environments, such as polyethylene sheet piles, steel pipe piles, and the like. It is widely used in marine structures as heavy corrosion protection coated steel for civil engineering such as steel sheet piles (for example, see Japanese Patent Publication No. 1-35023 for polyurethane-coated steel, and see Japanese Patent Publication No. 63-48697 for polyethylene-coated steel). ). The concrete anticorrosion coated steel materials for civil engineering are often subjected to concrete coping about one year after construction. However, shellfish such as barnacles adhere to the coating film within about one year after construction. For this reason, when performing concrete coping, it is necessary to physically peel off barnacles and the like, and the workability is poor. [0003] Therefore, there has been proposed a method for preventing the adhesion of shellfish by further coating a metal film made of cuprous oxide on the coating film, but the metal film is fragile. It is easily soluble in seawater. Therefore, when exposed to the marine environment for a long period of time, there is a problem that the adhesion of shellfish cannot be sufficiently prevented. [0004] In view of the above circumstances, an object of the present invention is to provide a heavy duty anticorrosion coated steel material capable of reducing the amount of shellfish such as barnacles even when exposed to the marine environment for a long period of time. [0005] In order to achieve the above object, a heavy duty corrosion-resistant coated steel material of the present invention comprises a steel material , a first resin film coated with the steel material, and a second resin film was separated <br/> distributed a C u particles on the first resin film and the Cu particles, 1
The particle size is in the range of ~ 5 μm and the resin film
80 to 120 parts by weight based on 100 parts by weight of fat solids.
It is characterized by the addition amount in the box. [0006] Further, in coating the resin film on the steel material coated with the polyethylene film, it is preferable to use an adhesive for polyethylene such as thermotack. When the heavy corrosion-resistant coated steel material of the present invention is exposed to a marine environment,
Since the first resin film protects the steel material from seawater and the like, and further, the Cu particles are dispersed in the second resin film.
Gradually elutes and the amount of adhesion of shellfish and the like can be reduced over a long period of time. Here, when the particle size of the Cu particles is in the range of 1 to 5 μm and Cu particles in the range of 80 to 120 parts by weight are added to 100 parts by weight of the resin solid content of the resin film, shellfish etc. Can be further reduced. On the other hand, if the particle size is less than 1 μm and the added amount exceeds 120 parts by weight, the film-forming properties of the paint will be poor and the durability will be poor. When the first resin film made of a polyethylene film is coated with the second resin film using a polyethylene adhesive such as thermotack, the resin film can be more firmly bonded. Further, the resin film in which the Cu particles are dispersed may have a thickness in the range of about 0.05 mm to 1.5 mm. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a heavy-corrosion-coated steel material according to the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing one embodiment of the heavy corrosion protection coated steel material of the present invention. Heavy corrosion resistant coated steel 10
Has a structure in which a steel material 12 is coated with a polyethylene film 14, and an acrylic resin film 18 in which Cu particles 16 are dispersed is coated on the polyethylene film 14. A polyurethane film may be coated instead of the polyethylene film 14. As the acrylate resin, a resin made of a polymer such as methyl acrylate, methyl methacrylate, or acrylonitrile can be used. Next, C dispersed in the acrylic acid resin film 18
The results of the measurement of the Cu elution rate and the amount of barnacles attached are shown by changing the particle size and the amount of addition of the u-particles 16. FIG. 2 is a graph showing the Cu elution rate with respect to the Cu addition amount, and FIG. 3 is a graph showing the barnacle adhesion amount with respect to the Cu elution rate. As shown in FIG. 2, the acrylic resin film 1
As the amount (parts by weight) of Cu added to the resin solid component (parts by weight) of No. 8 increased, the elution rate of Cu increased. Furthermore, even if the amount of Cu added was the same, the elution rate was faster as the particle size of the Cu particles was smaller. On the other hand, as shown in FIG. 3, the higher the Cu elution rate, the smaller the amount of barnacles attached, and the Cu elution rate is about 40 mg / m ² · d.
Above ay, barnacles hardly adhered to the marine environment for about one year. As described above, in the heavy duty anticorrosion coated steel material of the present invention, since Cu particles are dispersed in the resin film, when exposed to the marine environment, Cu gradually dissolves out for a long period of time. The amount of shellfish and the like can be reduced. As a result, the workability of concrete coping can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing one embodiment of a heavy corrosion-resistant coated steel material of the present invention. FIG. 2 is a graph showing the elution rate of Cu with respect to the amount of Cu added. FIG. 3 is a graph showing the amount of barnacle attached to the elution rate of Cu. [Description of Signs] 10 Heavy anticorrosion coated steel 12 Steel 14 Polyethylene film 16 Cu particles 18 Acrylic acid resin film

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification code FI E02D 31/06 E02D 31/06 CD (72) Inventor Takao Kurisu 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Corporation (72) Inventor Yoto Toyohara 2-3-2 Uchisaiwai-cho, Chiyoda-ku, Tokyo Kawasaki Steel Corporation (72) Inventor Yugo Oka 2-3-2 Uchisaiwai-cho, Chiyoda-ku, Tokyo Kawasaki Steel Corporation (72) 56) References JP-A-53-34630 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C23F 15/00 B32B 15/08 B32B 15/08 103 E02D 5/02 E02D 31 / 06

Claims (1)

(57) Patent Claims 1. A steel, a first resin film coated with steel material, a second resin containing dispersed C u particles on the first resin film And the Cu particles are in a range of 1 to 5 μm.
And the resin solid content of the resin film is 100
In the range of 80 to 120 parts by weight with respect to parts by weight
Protective coating steel, characterized in that.