JPH04224932A - Heavy-duty corrosion-resistant coated steel material for preventing adhesion of marine organism - Google Patents

Abstract

PURPOSE:To provide the superior effect of preventing the adhesion of marine organisms by bonding a velour sheet of superfine fiber on a heavy-duty corrosion-resistant coated surface of a heat-duty corrosion-resistant coated steel material. CONSTITUTION:A heavy-duty corrosion-resistant coated steel material is composed of a substrate-processed steel material with a chromate film, a primer layer, a corrosion-resistant coating material film layer, a bonding agent layer and velour sheet of superfine fiber laminated successively on the substrate, or of a substrate-processed steel material with a chromate film, a primer layer, a modified polyolefin layer, an olefin layer, a bonding agent layer and a velour sheet of superfine fiber laminated successively on the substrate, and the velour sheet of superfine fiber is bonded on said heavy-duty corrosion-resistant coated steel material through the bonding agent layer. Superfine fiber 1 is an organic fiber such as polyester fiber or vinylon fiber, and a bonding agent 2 is an epoxy bonding agent, a polyester bonding agent, a polyurethane bonding agent, a polyamide agent or a cyanocrylate bonding agent.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heavy-duty anti-corrosion coated steel material, and more particularly to a heavy-duty anti-corrosion coated steel material that prevents the adhesion of marine organisms and has excellent anti-corrosion properties.

0002

[Prior Art] Heavy-duty anti-corrosion coated steel materials used in the marine environment, such as jacket structures used in oil drilling, platforms, seawater intake pipes for power plants, steel pipe piles, square steel pipe piles, steel sheet piles, etc. In such cases, marine organisms often adhere to the surface, resulting in various negative effects. For example, in sea areas with severe waves, large amounts of marine fouling organisms adhere to jacket structures and platforms, increasing resistance to the waves and causing the structures to collapse.In addition, large amounts of marine fouling organisms adhere to the inner surfaces of seawater intake pipes. There are problems such as waterways being blocked. Furthermore, from an aesthetic point of view, there is a problem in that if a large amount of marine organisms adhere to steel pipe piles, steel sheet piles, etc., it will harm the landscape. A wide variety of fouling animals live in the ocean, including protozoa, which are protozoa that rank next to vertebrates in animal taxonomy, and fouling plants such as diatoms and seaweeds also proliferate. In particular, damage caused by the attachment of mussels, which breed in large numbers from autumn to spring, and barnacles, which breed in large numbers from spring to autumn, is particularly severe in the coastal waters of Japan. It costs a lot of money to remove such large amounts of attached marine organisms, so as a countermeasure, we have developed heavy anti-corrosion coated steel coated with an antifouling paint containing organic tin and cuprous oxide, which are toxic and prevent the attachment of organisms. is used.

0003

[Problems to be Solved by the Invention] However, the use of such toxic antifouling paints is being regulated due to concerns about their effects on the human body due to marine pollution and accumulation in fish and shellfish. Under these circumstances, there has been a desire to develop a heavy corrosion-resistant coated steel material that can prevent the adhesion of non-polluting marine organisms.

0004

[Means for Solving the Problems] As a result of intensive studies to solve the above problems, the inventors of the present invention have found that, as shown in FIG. The present inventors have discovered that adhesion of marine organisms can be prevented by adhering them together, leading to the present invention. The present invention will be explained in detail below. The ultrafine fibers are ultrafine fibers of harmless organic fibers that do not pollute the environment, such as polyester fibers, vinylon fibers, rayon fibers, polyethylene fibers, polypropylene fibers, fluorine fibers, nylon fibers, acrylic fibers, and polyurethane fibers. These ultrafine fibers are densely raised on a base material and formed into a sheet. Since the anti-adhesion effect is exerted by the fluctuation of ultrafine fibers in seawater, the length of the fibers after forming the napped sheet is preferably 2 mm or more, which is enough to cause fluctuations. Additionally, depending on aesthetic requirements, the fibers can be colored or patterned. As the adhesive used to bond the heavy anti-corrosion coating and the nap sheet, epoxy adhesive, polyester adhesive, polyurethane adhesive, polyamide adhesive, cyanoacrylate adhesive, etc. are used. Further, as the adhesive, it is also possible to use an adhesive type adhesive. In addition, if the adhesion between the heavy corrosion protection coating and the adhesive is poor, surface roughening, primer treatment, flame treatment, corona discharge treatment,
The adhesion may be improved by surface treatment such as plasma treatment.

[0005] The present inventors have discovered that by adhering a raised sheet of ultrafine fibers to the surface of a heavy anticorrosion coating via an adhesive layer, it is possible to prevent both the corrosion of steel and the adhesion of marine organisms. This discovery led to the present invention. A heavy anti-corrosion coated steel material 1 in FIG. 1 is a steel material on which a heavy anti-corrosion coating that primarily has a corrosion inhibiting effect is applied. What is heavy corrosion protection coating?
Steel materials that have undergone surface treatment are coated with polyolefin using a primer or the like, or painted with a heavy-duty anti-corrosion paint. The heavy anti-corrosion coating forms an anti-corrosion layer on the steel material, giving it long-term corrosion protection and stability on the adhesive coated surface. Next, the effect of the napped sheet 3 made of ultrafine fibers shown in FIG. 1 in preventing the adhesion of marine organisms will be explained. Many sessile creatures that live in the ocean, such as barnacles and mussels, prefer to attach to hard substrates such as rocks and concrete, and tend to avoid places with unstable substrates such as sand or seaweed surfaces. Taking advantage of this habit, we developed a raised sheet 3 made of organic microfibers that are densely grown so that they sway finely in the flow of seawater.
By adhering the material to a heavy-duty anti-corrosion coated steel material through an adhesive layer 2, we were able to invent a heavy-duty anti-corrosion coated steel material that prevents the adhesion of sea creatures such as shellfish and is also harmless.

[0006] Next, the structure of the heavy anti-corrosion coated steel material and the coating in the present invention will be explained. The heavy corrosion-resistant coated steel material in the present invention refers to steel material that has been subjected to surface treatment and then laminated with a chromate film, a primer layer, an anticorrosive paint layer, an adhesive layer, and a napped sheet of ultrafine fibers, or a steel material that is coated with a base layer. After the treatment, the ultrafine fibers are applied to the heavy corrosion-resistant coated steel material, such as a chromate coating, a primer layer, a modified polyolefin layer, a polyolefin layer, an adhesive layer, and a napped sheet of ultrafine fibers, through an adhesive layer. This is made by gluing together raised sheets. Heavy-duty anti-corrosion coated steel materials include, for example, steel pipes with heavy anti-corrosion coating on the outside as shown in Fig. 2 or 3, in which a chromate coating, an adhesive layer, and a napped sheet of ultrafine fibers are laminated in sequence, or as shown in Fig. 4 or 5. As shown in Fig. 6 or 7, a square steel pipe with a heavy anti-corrosion coating on the outside is laminated with an adhesive layer and a raised sheet of ultra-fine fibers, or a steel sheet pile with a heavy anti-corrosion coating is laminated with an adhesive layer and a coating as shown in Fig. 6 or 7. It is a product in which napped sheets of ultrafine fibers are laminated in sequence, or, as shown in FIG. 8, an adhesive layer and a napped sheet in coated ultrafine fibers are laminated in sequence on a steel pipe with heavy anti-corrosion coating on the inside.

[0007]

EXAMPLES Example 1 The outer surface of a steel pipe with a diameter of 200 A and a length of 5.5 m was blasted, a chromate treatment agent was applied, and after drying, a primer was applied and cured. Next, polyester was applied as an anti-corrosion paint and cured to produce a steel pipe with a heavy external anti-corrosion coating. A nap sheet made of polyester fibers having a diameter of 0.8 to 1.1 μm and a nap fiber length of 6 mm was adhered to this steel pipe with heavy anti-corrosion coating on the outside using a polyester adhesive. ) heavy corrosion-resistant coated steel materials were manufactured. The steel pipe with heavy external corrosion protection coating of Example (1) manufactured as described above and the steel pipe with heavy external corrosion protection coating of Comparative Example (1), which was not coated with a napped sheet of ultrafine fibers, were subjected to a two-year marine practical test. , the state of adhesion of marine organisms (particularly barnacles and mussels) was regularly investigated. The results are shown in Table 1. In the case of Comparative Example (1), a steel pipe with heavy external anti-corrosion coating in which no sheet was coated, barnacles and mussels started to adhere after 6 months, whereas in Example (1), a napped sheet of ultra-fine fibers was bonded. No adhesion was observed on steel pipes with heavy external corrosion protection coating even after two years.

Example 2 The outer surface of a steel pipe with a diameter of 200 A and a length of 5.5 m was blasted, a chromate treatment agent was applied, and after drying, it was heated with an induction heater and a primer was applied. Next, extrusion coating of modified polyethylene and polyethylene,
A steel pipe with heavy corrosion protection coating on the outside was fabricated. The present invention was carried out by flame-treating the externally coated polyethylene surface, and adhering a raised sheet made of vinylon fibers with a diameter of 0.8 to 1.1 μm to a raised fiber length of 6 mm through a polyamide adhesive. A heavy anti-corrosion coated steel material of Example (2) was manufactured. The steel pipe with heavy external corrosion protection coating of Example (2) manufactured as described above and the steel pipe with heavy external corrosion protection coating of Comparative Example (2) which was not coated with a napped sheet of ultrafine fibers were subjected to a two-year marine practical test.
The state of adhesion of marine organisms (particularly barnacles and mussels) was regularly investigated. The results are shown in Table 1. Comparative Example (2), which was not coated with a sheet, had barnacles and mussels attached to it after 6 months, whereas the exterior heavy-duty coated steel pipe of Example (2), which was coated with a napped sheet made of ultra-fine fibers, No adhesion was observed on the anti-corrosion coated steel pipes even after two years.

Example 3 The outer surface of a square steel pipe measuring 18 cm on a side and 5.5 m in length was blasted, a chromate treatment agent was applied thereto, and after drying, a primer was applied and cured. Next, a moisture-curing urethane coating was applied and cured to produce a rectangular steel pipe with a heavy corrosion protection coating on the outside. A raised sheet made of polyurethane fibers with a diameter of 0.8 to 1.1 μm and a raised fiber length of 6 mm was adhered to this square steel pipe with heavy anti-corrosion coating on the outer surface using a polyamide adhesive to form the outer surface of Example (3). A square steel pipe with heavy corrosion protection coating was manufactured. In addition, a square steel pipe with a diameter of 1000 μm was coated with a polyurethane adhesive on the outer surface of a square steel pipe with heavy anti-corrosion coating and coated with urethane.
A raised sheet made of polyurethane fibers formed to have a raised fiber length of 6 mm was adhered to produce a rectangular steel pipe with heavy external corrosion protection coating of Comparative Example (3). The square steel pipe with heavy external corrosion protection coating of Example (3) manufactured as described above and Comparative Example (3) were subjected to a two-year marine practical test, and the adhesion state of marine organisms (particularly barnacles, mussels, etc.) was investigated regularly. The results are shown in Table 1. Comparative Example (3), which was coated with a raised sheet of fibers, had barnacles and mussels attached to it after 6 months, whereas Example (3), which was coated with a raised sheet of ultra-fine fibers, had barnacles and mussels attached to it after 6 months. No adhesion was observed in the rectangular steel pipe with heavy external corrosion protection coating in 3) even after two years.

Example 4 The outer surface of a square steel pipe measuring 18 cm on a side and 5.5 m in length was blasted, a chromate treatment agent was applied, and after drying, it was heated with an induction heater and a primer was applied. Next, extrusion coating of modified polyethylene and polyethylene was performed to produce a rectangular steel pipe with heavy external corrosion protection coating. A napped sheet made of polyethylene fibers with a diameter of 0.8 to 1.1 μm and a napped fiber length of 6 mm was adhered to this square steel pipe with heavy anti-corrosion coating on the outside through an adhesive layer of acrylic adhesive.
4) A square steel pipe with heavy corrosion protection coating on the outside was manufactured. In addition, polyethylene externally coated square steel pipes with a diameter of 0.8 to 1.1 μm are used.
A square steel pipe with heavy external corrosion protection coating of Comparative Example (4) was manufactured by bonding a sheet made of polyethylene fibers having a napped fiber length of 1 mm. The square steel pipe with heavy external corrosion protection coating of Example (4) manufactured as described above and Comparative Example (4) were subjected to a two-year marine practical test, and the state of adhesion of marine organisms (particularly barnacles and mussels) was investigated. Surveyed regularly. The results are shown in Table 1. The square steel pipe with heavy external corrosion protection coating of Comparative Example (4) was
After a few years, barnacles and mussels started to adhere to the surface, but the example covered with a napped sheet made of ultra-fine fibers (
No adhesion was observed in the rectangular steel pipe with heavy external corrosion protection coating in 4) even after two years.

Example 5 The peaks of a steel sheet pile of type FSP-III, 5.5 m long, were blasted, a chromate treatment agent was applied, and after drying,
Primer was applied and cured. Next, a moisture-curing urethane was applied as an anticorrosive paint and cured to produce heavy anticorrosion-coated steel sheet piles. A raised sheet made of fluorine fibers with a diameter of 0.8 to 1.1 μm and a raised fiber length of 6 mm was adhered to this heavy-duty anti-corrosion coated steel sheet pile using an epoxy adhesive. Coated steel sheet piles were manufactured. Also,
As Comparative Example (5), a heavily anti-corrosion coated steel sheet pile before being coated with a raised sheet was used. Example manufactured as above (
The heavily anti-corrosion coated steel sheet pile of 5) and Comparative Example (5) were subjected to a two-year marine practical test, and the state of adhesion of marine organisms (particularly barnacles, mussels, etc.) was periodically investigated. The results are shown in Table 1. The heavy anti-corrosion coated steel sheet pile of comparative example (5) was 6
After a few months, barnacles and mussels started to adhere to the steel sheet pile, whereas the heavily anti-corrosion coated steel sheet pile of Example (5), which was coated with a napped sheet of ultra-fine fibers, showed no adhesion even after two years.

Example 6 FSP-III type steel sheet pile with a length of 5.5 m was subjected to blasting in the valleys, coated with a chromate treatment agent, and after drying,
Primer was applied and heated to cure. Next, an electron beam crosslinked polyethylene sheet laminated with a modified polyethylene adhesive was pasted to produce a heavy anti-corrosion coated steel sheet pile. Furthermore, through polyurethane adhesive, diameter 0.8 to 1
．． 1μm polypropylene fiber with napped fiber length of 6mm
The heavy anti-corrosion coated steel sheet pile of Example (6) was manufactured by adhering the raised sheet formed in the above. In addition, a raised sheet made of polypropylene fibers having a raised fiber length of 6 mm was adhered to the steel sheet pile using an adhesive to produce a steel sheet pile of Comparative Example (6). The heavy anti-corrosion coated steel sheet pile of Example (6) manufactured as described above and the steel sheet pile of Comparative Example (6) were subjected to a two-year marine practical test. The state of adhesion was periodically investigated. The results are shown in Table 1. Example (6) covered with a raised sheet made of ultra-fine fibers
) and the steel sheet pile of comparative example (6) are both 6.
After several months, no barnacles or mussels were observed. However, since the steel sheet pile of Comparative Example (6) did not have a heavy anti-corrosion coating layer, corrosion occurred at the bottom of the sheet after one year, and after two years, the sheet peeled off and the entire surface was corroded and barnacles were formed. Many adhered.

Example 7 The inner surface of a steel pipe with a diameter of 200 A and a length of 400 mm was blasted, a chromate treatment agent was applied, and after drying, a primer was applied and cured. Next, an epoxy anticorrosive paint was applied and cured to produce a steel pipe with heavy internal corrosion protection coating. A raised sheet made of nylon fibers with a diameter of 0.8 to 1.1 μm and a raised fiber length of 6 mm was adhered to this steel pipe with heavy inner surface corrosion protection coating using an epoxy adhesive to form a steel pipe with heavy inner surface corrosion protection coated in Example (7). Coated steel pipes were manufactured. In addition, as a comparative example (7), a steel pipe with heavy anti-corrosion coating on the inside without coating the napped sheet of ultrafine fibers was used. Example manufactured as above (
7) and the seawater intake pipe of Comparative Example (7) were connected in parallel to the steel pipe with heavy anti-corrosion coating on the inner surface, and a practical marine test was carried out for 2 years (once every 4 hours,
Water was passed through the tube for approximately 3 minutes at a flow rate of 1.0 m/min), and the state of adhesion of marine organisms (particularly barnacles and mussels) was periodically investigated. The results are shown in Table 1. The steel pipe with heavy anti-corrosion coating on the inner surface of Comparative Example (7) started to have barnacles and mussels attached after 6 months, whereas the steel pipe with heavy anti-corrosion coating on the inner surface of Example (7) coated with a napped sheet of ultra-fine fibers , almost no adhesion was observed even after 2 years.

Example 8 The valleys of a steel sheet pile of type FSP-III with a length of 5.5 m were blasted, a chromate treatment agent was applied, and after drying,
Primer was applied and cured. Next, a moisture-curing urethane was applied as an anticorrosive paint and cured to produce heavy anticorrosion-coated steel sheet piles. A diameter of 0.8 to 1.1 μm was applied to this heavy anti-corrosion coated steel sheet pile using a cyanoacrylate adhesive.
The heavy anti-corrosion coated steel sheet pile of Example (8) was manufactured by adhering a raised sheet made of acrylic fibers having a raised fiber length of 6 mm. The heavy anti-corrosion coated steel sheet pile of Comparative Example (8) produced as described above was subjected to a two-year marine practical test, and the state of adhesion of marine organisms (particularly barnacles, mussels, etc.) was periodically investigated. The results are shown in Table 1. The heavily anti-corrosion coated steel sheet pile of Example (8) coated with a raised sheet of ultra-fine fibers showed no adhesion of barnacles or mussels even after two years.

Example 9 The outer surface of a steel pipe with a diameter of 200 A and a length of 5.5 m was blasted, a chromate treatment agent was applied, and after drying, a primer was applied and cured. Next, urethane was applied as an anti-corrosion paint and cured to produce a steel pipe with a heavy external anti-corrosion coating. A raised sheet made of rayon fibers with a diameter of 0.8 to 1.1 μm and a raised fiber length of 6 mm was adhered to the coated steel pipe with heavy anticorrosion coating on the outer surface of the steel pipe in Example (9). Heavy duty anti-corrosion coated steel pipes were manufactured. The steel pipe with heavy external corrosion protection coating of Example (9) manufactured as described above was subjected to a two-year marine practical test, and the state of adhesion of marine organisms (particularly barnacles, mussels, etc.) was periodically investigated. The results are shown in Table 1. In the steel pipe of Example (9) with a heavy anti-corrosion coating on the outer surface to which a napped sheet of ultra-fine fibers was adhered, no adhesion was observed even after two years.

[Table 1]

[0016]

[Effects of the Invention] As is clear from the above explanation, the harmless heavy corrosion-resistant coated steel material in which the raised sheet of ultra-fine fibers is bonded via an adhesive according to the present invention has a heavy anti-corrosion coating that does not cover the raised sheet of ultra-fine fibers. It showed superior effectiveness in preventing the adhesion of marine organisms compared to those that were coated only with a napped sheet of ultra-fine fibers without steel or heavy anti-corrosion coating.

[Brief explanation of the drawing]

FIG. 1: Covering a raised sheet of ultrafine fibers according to the present invention,
FIG. 2 is a cross-sectional view of a heavy corrosion-resistant coated steel material that prevents the adhesion of marine organisms.

[Fig. 2] Covering a napped sheet of ultrafine fibers according to the present invention,
FIG. 2 is a partially cutaway sectional view of a circular steel pipe with a heavy corrosion protection coating on the outside that prevents the adhesion of marine organisms.

[Fig. 3] Covering a napped sheet of ultrafine fibers according to the present invention,
FIG. 2 is a partially cutaway sectional view of a circular steel pipe with a heavy corrosion protection coating on the outside that prevents the adhesion of marine organisms.

FIG. 4: Covering a napped sheet of ultrafine fibers according to the present invention,
FIG. 2 is a partially cutaway sectional view of a rectangular steel pipe with a heavy corrosion protection coating on the outside that prevents the adhesion of marine organisms.

FIG. 5: Covered with a napped sheet of ultrafine fibers according to the present invention,
FIG. 2 is a partially cutaway sectional view of a rectangular steel pipe with a heavy corrosion protection coating on the outside that prevents the adhesion of marine organisms.

FIG. 6: Covered with a napped sheet of ultrafine fibers according to the present invention,
It is a cross-sectional view showing a part of a steel sheet pile with heavy corrosion protection coating that prevents the adhesion of marine organisms.

FIG. 7 is a cross-sectional view showing a part of a heavy anti-corrosion coated steel sheet pile coated with a napped sheet of ultra-fine fibers to prevent the adhesion of marine organisms.

FIG. 8 is a partially cutaway sectional view of a steel pipe with heavy internal corrosion protection coating coated with a napped sheet of ultrafine fibers to prevent the adhesion of marine organisms.

[Explanation of symbols]

1 Heavy duty anti-corrosion coated steel 2 Adhesive layer 3. Ultra-fine fiber raised sheet 4. External heavy anti-corrosion coated steel pipe 5 Steel pipe 6 Chromate film 7 Primer layer 8 Anti-corrosion paint film 9 Modified polyolefin layer 10 Polyolefin layer 11　External heavy anti-corrosion coated square steel pipe 12　Square steel pipe 13 Heavy anti-corrosion coated steel sheet pile 14 Steel sheet piles 15　Inner heavy anti-corrosion coated steel pipe

Claims (10)

[Claims] 1. A heavily anti-corrosion coated steel material for preventing the adhesion of marine organisms, characterized in that a napped sheet of ultrafine fibers is adhered to the surface of the heavy anti-corrosion coat via an adhesive layer. [Claim 2] The ultrafine fibers are polyester fibers, vinylon fibers, rayon fibers, polyethylene fibers, polypropylene fibers, fluorine fibers, nylon fibers, acrylic fibers,
The heavy-duty anti-corrosion coated steel material for preventing the adhesion of marine organisms as claimed in claim 1, characterized in that it is made of organic fibers such as polyurethane fibers. 3. Preventing the adhesion of marine organisms according to claim 1, wherein the adhesive is an epoxy adhesive, a polyester adhesive, a polyurethane adhesive, a polyamide adhesive, or a cyanoacrylate adhesive. Heavy corrosion-resistant coated steel material. 4. The method according to claim 1, wherein a chromate coating, a primer layer, an anticorrosive paint coating, an adhesive layer, and a napped sheet of ultrafine fibers are sequentially laminated on the outer surface of a steel pipe that has been subjected to surface treatment. Steel pipe with heavy external corrosion protection coating to prevent corrosion. 5. The marine life according to claim 1, characterized in that a chromate coating, a primer layer, a modified polyolefin layer, a polyolefin layer, an adhesive layer, and a napped sheet of ultrafine fibers are sequentially laminated on the outer surface of a steel pipe that has been subjected to a base treatment. Steel pipe with heavy corrosion protection coating on the outside to prevent the adhesion of 6. The marine organism according to claim 1, wherein a chromate coating, a primer layer, an anticorrosive paint coating, an adhesive layer, and a napped sheet of ultrafine fibers are sequentially laminated on the outer surface of a square steel pipe that has been subjected to a base treatment. Square steel pipe with heavy corrosion protection coating on the outside to prevent adhesion. 7. The marine vessel according to claim 1, characterized in that a chromate coating, a primer layer, a modified polyolefin layer, a polyolefin layer, an adhesive layer, and a napped sheet of ultrafine fibers are sequentially laminated on the outer surface of a square steel pipe that has been subjected to a base treatment. A square steel pipe with heavy corrosion protection coating on the outside to prevent the adhesion of living organisms. 8. The marine organism according to claim 1, wherein a chromate coating, a primer layer, an anticorrosive paint coating, an adhesive layer, and a napped sheet of ultrafine fibers are sequentially laminated on the surface of the steel sheet pile that has been subjected to a base treatment. Steel sheet piles with heavy corrosion protection coating to prevent adhesion. 9. The marine product according to claim 1, wherein a chromate coating, a primer layer, a modified polyolefin layer, a polyolefin layer, an adhesive layer, and a napped sheet of ultrafine fibers are sequentially laminated on the surface of the steel sheet pile that has been subjected to surface treatment. Steel sheet piles with heavy anti-corrosion coating to prevent the attachment of living organisms. 10. The method of preventing the adhesion of marine organisms according to claim 1, characterized in that a primer layer, an anticorrosive paint film, an adhesive layer, and a napped sheet of ultrafine fibers are sequentially laminated on the inner surface of a steel pipe that has been subjected to surface treatment. Steel pipe with heavy anti-corrosion coating on the inside.