JPS5876392A - Method for protecting submerged portion of surface drifting object such as vessel or buoy - Google Patents

Abstract

PURPOSE:To protect a submerged portion from corrosion and attachment of harmful organisms for a long time by protecting the surface of a structure with a flame coating film made of material having an excellent corrosion resistance and by protecting the flame coating film with a protective coat in a sealing condition. CONSTITUTION:A material with an excellent corrosion resistance such as Al is flame coated on the submerged portion of a surface drifting object such as a vessel, buoy, etc. to coat and form a flame coating film, then an epoxy resin is coated on the flame coating film surface to coat and form a protective coat. Thereby, according to an experimental result of a test piece submerged at 2m below the sea surface for 4 months, no harmful organism has attached. In addition, no toxic material seeping out of a paint is required and also a re-painting work of a ship's bottom can be omitted.

Description

[Detailed Description of the Invention] Currently, ijEm material is used to protect the bottoms of ships, buoys, etc. from corrosion and to prevent harmful organisms such as barnacles and bivalves from adhering to the bottoms of ships.

The third type of ship bottom paint is applied to the outer surface of the ship's bottom to exhibit the above-mentioned effects, but the paint dissolves due to toxic substances such as cuprous zinc. The pest extermination effect is limited, and is generally said to last for 3 to 6 months. Therefore, the current situation is that the bottom of the ship must be repainted at predetermined intervals, which imposes a considerable burden of cost and labor.

The present invention provides a method that corrects the above-mentioned conventional method, that is, a method that can protect parts of floating objects such as ships and buoys that are immersed in water from corrosion and harmful organisms for a long period of time. With the goal.

In carrying out the method of the present invention, for example, in the case of a ship, it is necessary to apply a blast treatment to the surface of the steel plate on the part of the ship that will be immersed in water and on the upper part thereof. This plast treatment can be carried out, for example, using automatic plast rereading under the following conditions.

Plast material: 8GH50 (@m-grid)
ノ 〆 1ru 41: :
6 ■Pressure -, force: Plast distance to 6%: 250 ■ Angle 90 @ method
° Pressure-feeding blast After the blasting process, a material with good corrosion resistance, such as aluminum, zinc, stainless steel, ceramics, or silicone, is thermally sprayed to form a thermal sprayed film on the surface of the steel plate. This thermal spraying operation can be carried out using, for example, an automatic thermal spraying device under the following conditions.

Thermal spraying material: Aluminum wire drawing (diameter 3.1-) Thermal spraying method: Flame spraying Oxygen flow rate: 44II/min Acetine flow rate: 4oL/min Air flow rate
53! /min Linear velocity ゛ 3711m/min Spraying distance
200 - Thermal spraying angle 90° Sprayed film thickness = 120~150 μsi After the I period thermal spraying work, apply epoxy resin, densified copper, etc. to the surface of the sprayed film using a stylus, etc., and then dry it naturally and store it.
Form sm=4. The thickness of the protective film, such as epoxy resin, is set at about 30 to 4.0 #.

In order to prove the effects of the present invention, four test specimens were prepared and immersed for four months at a location 2 m below the sea surface. The test piece was 8841 material with a length of 600-1 iJ [250-1 thickness 3.
Using a piece cut into 2 squares, one side (treated side) was subjected to the method of the present invention, and the other side (untreated side) was left as is.

■ Test piece I An aluminum sprayed film was formed using the flame spraying method described above, and Evo! fS/Protective film formed with resin.

■　Test piece■ Aluminum is coated using the flame spray method described above. A thermally sprayed coating is formed using oxidized steel, and a protective coating is formed using oxidized steel.

■ After preparing the test piece, a zinc sprayed film was formed using the arc spraying method under the following conditions, and the finish was V'! A protective film formed with IM fat.

Thermal spraying material: Zinc wire drawing (diameter 1.6111) Arc current = 200 m Pressure ° 4% Spraying distance ° 200 ■ Spraying angle ° 90 ° ■ Test piece W A zinc spray film was formed using the above-mentioned arc spraying method. , with a protective film formed from oxidized steel.

(Experimental Results) The above test pieces were immersed in the sea for 4 months, resulting in the following conditions.

■ Test piece 1 1 & surface increase) No harmful organisms attached.

(Untreated @) Kananekanza V adhered to the entire surface, and 2 other oysters and 7 fujibbo were attached. Test piece■ (Pond S) No harmful organisms attached.

(Non-silver S side) Power 4P Nekanza V sticks to the entire surface.

■ Thoughts on the exam (Treatment surface) No harmful organisms attached.

(Untreated surface) Kasane Kanza V and Fujibbo adhere to the entire surface.

■ Test piece W (Boiling water surface) No harmful organisms attached.

(Non-silver S side) Kasane Kanza V adheres to the entire surface. Other oysters 1111% Fujibbo 7 pieces Jt, - arrival.

No corrosion phenomenon was observed on all treated surfaces of the specimen.

According to the present invention, the problem of harmful organisms adhesion and the problem of corrosion resistance can be solved by the seawater immersion experiment as described above. In addition, according to the conventional method, the effect of exterminating harmful organisms due to the toxic substances dissolved in the paint was limited, but according to the present invention, the poison
As the effect of preventing the attachment of harmful organisms can be maintained for a long period of time without the need for materials, it is possible to omit the work of repainting the bottom of the ship, which was necessary in the past, and save cost and labor. Furthermore, according to the present invention, the surfaces of structures and objects are protected by a sprayed film made of a material with excellent corrosion resistance and properties, and the sprayed film is protected in a pore-sealing manner by a protective film.
It provides double protection for structures and has excellent corrosion resistance.

Applicant: Sunny International Co., Ltd.
Masakatsu Komi

Claims (1)

[Claims] (11) A ship characterized in that a material with good corrosion resistance is thermally sprayed on the part of the floating object to be immersed in water to form a thermally sprayed film, and then a protective film is formed on the surface of the thermally sprayed film,
How to protect the parts of floating objects such as buoys that are immersed in water