JPH04230483A - Ship - Google Patents

Abstract

PURPOSE:To suppress marine life from adhesion on the bottom, etc., of a ship. CONSTITUTION:Marine life is suppressed from sticking by using a member, in which a carbon film or a film mainly composed of carbon is formed, for the bottom, side, etc., of a ship.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to members that are constantly in contact with seawater, such as the bottom and sides of ships navigating the ocean.

0002

[Prior Art] In general, sea creatures such as oysters, barnacles, and other shellfish, as well as seaweed, adhere to parts of ships that are in constant contact with seawater, such as the bottom and side of the ship, which create resistance to the seawater during navigation.
This poses a problem in that ships are unable to demonstrate their original performance. Therefore, in order to prevent these marine organisms from adhering to the bottom and sides of the ship, poisonous substances such as organic metals are mixed into the paint applied to the bottom and sides of the ship, and this toxic substance kills and eliminates the marine organisms that adhere to the bottom and sides of the ship. are doing.

0003

[Problem to be Solved by the Invention] However, the elimination of marine organisms by such a method results in the discharge of toxic substances into the sea.
It has become a serious environmental problem. Furthermore, due to the health problems of workers who apply paints containing such toxic substances, there has been a desire for a method for eliminating sea creatures that does not use toxic substances.

0004

[Means for Solving the Problems] The present invention provides a member that can eliminate marine organisms without using these toxic substances. The present inventors have developed a carbon film or a carbon-based film for surface hardening of plastics, etc. using plasma C.
It has already been found that the product formed by VD is very effective, and a patent application filed by the present inventors in 1983-23.
0787, patent application No. 63-230788, patent application No. 63
-233166 etc. are known.

The surface hardness of these carbon films or films mainly composed of carbon formed by plasma CVD is similar to that of diamond (600 to 6000 as Vickers hardness).
Kg/cm2) and has a very low coefficient of friction. Furthermore, since the main component is carbon, it is very compatible with organic substances such as paints, and has excellent adhesive properties.

Experiments have revealed that the ship of the present invention is a very effective application of membranes having these characteristics. In other words, even if a carbon film or a film mainly composed of carbon formed by the plasma CVD described above was formed on a coated metal and kept in seawater for many years, no adhesion of marine organisms was observed. be. Examples are shown below.

[0007]

EXAMPLE A method of forming a film according to the present invention will be described. A first pair of electrodes (first and second electrodes) are provided at one end and the other end of a reaction space spaced apart from each other for plasma polymerization or plasma CVD. Furthermore, another electrode (third electrode) for applying an alternating current bias is provided in this space, and the third electrode is arranged so as to be in contact with the back surface of the substrate or member having the surface to be formed. A first alternating voltage is applied between the pair of electrodes to turn the reactive gas into plasma. Each of these electrodes has a phase difference of 18 with respect to ground.
High frequency voltages different by 0° or 0° are applied from respective high frequency power supplies, and alternating voltages that are symmetrical or in phase with each other are applied. As a result, substantially one high-frequency alternating voltage is applied within the frame structure to induce a high-frequency plasma for completely decomposing and ionizing the reactive gas. Further, the other end of each high frequency power source is grounded. Further, a third electrode is provided in contact with the back surface of the base or member, and a second alternating voltage is applied thereto. Then, the ions accelerated by the second alternating voltage sputter on the formation surface of the member, forming a strong film on the formation surface. At this time, a blocking capacitor is inserted between the power source that generates the second alternating voltage and the third electrode, and a negative DC bias is self-generated to the third electrode. Therefore, cation bombardment is applied to the surface of the base or member that is in contact with the third electrode.

As an example of forming this thin film, ethylene (
C2H4), methane (CH4), acetylene (C2H2
) or a mixture of hydrocarbon gas and nitrogen fluoride, or a carbon fluoride gas such as carbon fluoride such as C2F6, C3F8, CF4, CH2F2, etc. is introduced and decomposed to create a diamond similar to SP3 orbital. C of
- Create a C bond, specific resistance (specific resistance) 1 x 106 ~ 5
×1012Ωcm typically 1×108 to 5×1011
Ωcm and the optical energy band width (E
g) is 1.0 eV or more, preferably 1.5 to 5.
A carbon film or a film containing carbon as a main component (the main subcomponents are hydrogen, fluorine, and nitrogen) was formed, which has characteristics similar to those of diamond and is transparent in the visible region of 5 eV.

A member having the coating thus formed was attached to the bottom of a ship, and a comparison was made with a member coated with a paint containing no organic metal as a reference. After being left in the sea for 6 months, parts with a carbon film or a film mainly composed of carbon had almost no adhesion of seaweed, while parts coated with paint that did not contain organic metals had some seaweed adhesion. was observed.

[0010] In this embodiment, a method of forming a film using reduced pressure is shown, but it is also possible to form a film using glow discharge or arc discharge at atmospheric pressure.

[0011]

[Effects of the Invention] As described above, by coating the bottom or side of a ship with the carbon film or a film mainly composed of carbon according to the present invention, it is possible to suppress the adhesion of marine organisms without using toxic substances, thereby improving the environment. It can make a major contribution to conservation. In addition, consideration was given to the health of painting workers.

Claims (1)

[Claims] 1. A ship sailing on the ocean, characterized in that members such as the bottom and side of the ship that are in constant contact with seawater are covered with a carbon film or a film containing carbon as a main component.