JPS61235527A - Copper alloy for preventing fouling of marine life - Google Patents

Abstract

PURPOSE:To provide a Cu alloy consisting of specified amounts of Mn and Ni and the balance Cu and having an extremely significant effect to prevent the fouling of oceanic life. CONSTITUTION:This Cu alloy consists of 1.0-5.0% Mn, 1.0-30% Ni and the balance Cu with inevitable impurities, can prevent economically and perfectly the fouling of marine life such as barnacles, and has high workability. In case of <1.0% Mn, the effect of the alloy to prevent the fouling of barnacles is reduced, and in case of <=5.0% Mn, the antifouling effect is especially significant. In case of <1% Ni, the alloy has low workability, and in case of >30% Ni, the effect of the alloy to prevent the fouling of marine life is reduced and the cost of the alloy is increased. It is preferable that the amount of other elements including impurities is regulated to <=about 0.1%.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is a pie for seawater desalination equipment! , heat exchanger pipes,
The present invention relates to a copper alloy that has extremely excellent properties for preventing the adhesion of marine organisms and can be used alone or in combination with other materials for other marine equipment.

(Prior Art) In recent years, various structures have been installed underwater in order to effectively utilize the various resources and energy present in the ocean.

In the energy field, seawater is often used as cooling water in power plants, and a large number of heat exchanger pipes and other materials are used for this purpose. Furthermore, large-scale seawater desalination plants are in operation in the Middle East to desalinate seawater.

In all of the above cases, the biggest problem is the attachment of barnacles, crayfish, and marine life. In other words, in the case of floating marine structures, the buoyancy decreases due to these marine organisms, in the case of ships, fuel consumption increases due to a decrease in navigation speed, and in the case of heat exchangers, the heat transfer coefficient decreases. This is causing troublesome problems for Miyabi, such as inviting people.

Now, since copper has good heat conductivity, Kiep O with N1 added is used.
= y Kel (90%Cu-10%N1.70%C-3
0%N1) is a seawater desalination pipe (A, Coh・n.

L, Rlcs”, Materials Prote
ctlon Daember 1969p67/69
), and the toxicity of copper was used during navigation.
A fishing boat (M, PRAAGER) is made of a composite material made by welding cuglonickel on steel to which A-shells do not easily adhere.

E, W, THIELE, Jr: W@ldlng
Journal May 1 977P 15/
23, M, PRAGERat al: W@l
ding JournalSept@mber 197
8 P22/ 31, M, PRAGER.

E, W, THIELE; Weldlng Jou
rnal July 1979P17/24) There is an example of using K.

(Problems to be Solved by the Invention) The present invention provides a new copper alloy that can completely prevent marine biofouling, which is economically and economically acceptable. The purpose is to

(Means for Solving the Problems) The above-mentioned object of the present invention is to solve the following problems: Mn 1.0-30%, Ni
This is achieved by a copper alloy characterized by containing 1.0 to 30% Cu with the remainder being Cu and unavoidable impurities.

First, the copper alloy of the present invention is, for example, a part of Ni in 90 Cu -10Ni f Mn VCflt replaced with 70 Cu -
Cu-N with Mn YC replaced part of 30Ni0N1
Since it is an i-Mn alloy, it is extremely economical. The reason why the copper alloy of the present invention exhibits a marine biofouling prevention effect superior to that of cupronickel is that when the Mn contained in the copper alloy dissolves in seawater, it is immediately oxidized by dissolved oxygen and becomes colloidal particles of γMn2O3 or Mn3O4. This adsorbs the cut eluted from the alloy and coats the entire surface of the copper alloy with gold. It is estimated that this prevents the larvae from adhering to the surface. Further, Ni was added because even a small amount of Ni is effective in preventing the adhesion of seaweed, and at the same time it is easy to process into boards, strings, etc.

The biggest feature of the copper alloy of the present invention is that it contains Mn.
A) Moreover, it is preferable that only Nl is contained other than Mn, and the amount of other elements including impurities is 0.1% or less. The reason why the Mn content is limited to 1 to 30% is that if the Mn content is less than 1%, the effect of preventing the adhesion of fujibbo will be reduced, and if it exceeds 30%, the workability will deteriorate.

The reason for limiting the content to N1111 to 30% is that if the content is less than 11%, the processability is poor, and if it exceeds 30%, the effect of preventing the adhesion of marine organisms will deteriorate and the VC will become expensive. Also, the amount of other elements containing impurities was set to 0.1% or less because o, i
This is because, if it exceeds s, the effect of preventing marine organisms from adhering will deteriorate significantly. The copper alloy of the present invention can be used alone for heat exchangers or as a composite material coated on the surface of titanium or a titanium-based alloy, such as a wire rope or a composite material plate. It can also be used with a full coating of copper alloy. In any case, when using the copper alloy of the present invention in a part that comes into contact with seawater,
Any shape can have a significant effect on preventing marine organisms from adhering.

(Example) Examples of the present invention are shown below.

Copper alloy containing one or more strains of Mn, At*Fe*St, and the remainder being 80 to 90% copper in addition to Nl, and MnrAl1Fe in addition to Nl
# Contains one or more types of Si, the remainder is 70~
Copper alloy consisting of 80% copper, 90%Cu -10fb
Ni-based or 70% Cu-30% Ni-based cupronickel is melted and rolled, and then rolled to a plate thickness of 2trm and 30 to 50mX.
The sample was machined to a size of 100 mm, the entire surface was mechanically polished, and then degreased to prepare a sample. The entire surface of this sample was immersed in seawater 1 m below the sea surface, and the adhesion of barnacles occurring from spring to summer to autumn was observed. The results are shown in Table 1.

It is clear from Table 1 that almost no fujibbo adhesion is observed in the Cu--Ni alloy containing Mn'c.

(Effect of the invention) Currently, marine floating structures (steel, concrete) that require external checks for corrosion and damage -) 1! ! ! Furthermore, when the copper alloy of the present invention is used, there is less adhesion of marine organisms and maintenance becomes easy. In addition, composite gold in which titanium or a titanium-based alloy part is coated with the copper alloy of the present invention can be used as a pipe material for heat exchangers that use seawater as cooling water, for example, to prevent corrosion and the adhesion of marine organisms. We can expect many uses.

Procedural amendment (voluntary) May 9, 1986 1985 Patent Application No. 59490 2゜Name of invention Steel alloy for preventing marine biofouling 3. Person who makes corrections Relationship to the incident: Patent applicant 2-6-3 Otemachi, Chiyoda-ku, Tokyo (665) Nippon Steel Corporation Representative Takeshi 1) Yutaka 4. Agent〒100 2-4-1 Marunouchi, Chiyoda-ku, Tokyo (1) Amend the claims as shown in the attached sheet.

(2) Specification page 3 line 8 rMn1. o ~ 30%” rMn
1, 0 to 5.0%.

(3) Page 5, lines 9 to 15, the amount of rMn is set to 1 to 30%...
This is because it deteriorates. ' shall be amended as follows.

If rMn is less than 1%, the effect of preventing Fujibuki adhesion is reduced. Further, as shown in the examples described below, the MnN content was set to within 5%, which provides particularly good antifouling properties. (4) Same page 5 9
-70% Cu -30% Ni system cupronickel is melted in addition to rNi in line 15, and `` is corrected as follows.

[Various copper alloys having the compositions shown in Table 1 were melted.

That is, they are a Cu-Ni-Mn based copper alloy containing Mn in addition to Ni, and the remainder being substantially copper, and a copper alloy for comparison.

These copper alloys are (5) Table 1 on page 7 shall be amended as shown in the attached sheet.

Attachment Claims Mn: 1.0-5.0%, Ni: 1.0-30%
A copper alloy for preventing the adhesion of marine organisms, the balance being Cu and unavoidable impurities.

Claims (1)

[Claims] A copper alloy for preventing the adhesion of marine organisms, containing Mn: 1.0-30%, Ni: 1.0-30%, and the balance consisting of Cu and inevitable impurities.