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Method for enhancing antifouling properties of high entropy alloys

a high entropy alloy and antifouling technology, applied in the field of high entropy alloys, can solve the problems of significant losses in the fishing industry, dramatic societal and economic costs, and fish in the fishing net to die off, and achieve the effects of enhancing antifouling properties, preventing the attachment of marine organisms, and high entropy

Inactive Publication Date: 2017-09-21
POSTECH ACAD IND FOUND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a method to prevent the attachment of marine organisms to high entropy alloys used in ships or marine structures. This is achieved by using severe plastic deformation to reduce the grain size in the alloy and impart to it a property that suppresses the attachment of aquatic or marine organisms.

Problems solved by technology

Moreover, the holes of fishing nets are blocked, inhibiting the supply of oxygen and thereby causing the fish in the fishing nets to die off, which results in significant losses to the fishing industry.
In addition, cleaning and replacement of damaged structures results in dramatic societal and economic costs.
However, TBT usage has recently caused significant environmental problems, which has resulted in TBT being legally regulated around the world starting in 2000, and thus difficult to use, and silicone based paints are limited in that the effectiveness of the antifouling effect is poor.
Therefore, various antifoulants are being developed to replace TBT, but do not fundamentally resolve the environmental problems.

Method used

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  • Method for enhancing antifouling properties of high entropy alloys
  • Method for enhancing antifouling properties of high entropy alloys

Examples

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Example 1

[0024]In Example 1 of the invention, a Co—Cr—Fe—Mn—Ni based high entropy alloy was used, having excellent mechanical properties and excellent corrosion resistance, which, in particular, is an essential property for marine structures and ships.

[0025]The specific composition of the alloy is 10 at % of Co, 15 at % of Cr, 25 at % of Fe, 10 at % of Mn, and 40 at % of Ni.

[0026]First, a specimen for a high pressure torsion process was prepared using a high entropy alloy sheet (the grain size of the sheet is 15 μm) having a diameter of 10 mm and a thickness of 1.5 mm, and a torsion process in which the sheet was rotated under a pressure of 5 GPa was performed 10 times in order to reduce the structure of the material.

[0027]FIG. 1 is a photograph illustrating the microstructure of a high entropy alloy observed using transmission electron microscopy after a torsion process according to Example 1 of the invention is performed. As shown in FIG. 1, it was observed that the grains were re...

example 2

[0029]In order to confirm whether high pressure torsion deformation according to the invention can be used to obtain the same effect in other metal materials, a sheet (the grain size of the sheet is 20 μm) formed of STS304 stainless steel was prepared under the same conditions as Example 1.

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Abstract

The invention relates to a method capable of enhancing both the antifouling properties of a high entropy alloy and also the mechanical properties thereof, without using chemical substances such as antifouling paints to prevent the attachment of animals and plants such as barnacles, mussels, sea lettuces, diatoms, etc., the method according to the invention being characterized by the use of severe plastic deformation to reduce the grain size in a high entropy alloy and thereby impart to the high entropy alloy a property of suppressing the attachment of aquatic or marine organisms, and according to the method, environmental issues caused by the use of antifouling paint, which is conventionally the most widely used method, may be resolved, and the energy efficiency of ships may be improved, thereby reducing societal and economic loss.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a method for enhancing the antifouling properties of high entropy alloys, and more particularly, to a method for enhancing the antifouling properties of high entropy alloys, wherein the attachment of animals and plants such as barnacles, mussels, sea lettuces, diatoms, etc., may be prevented without using chemical substances such as antifouling paints, while also improving the physical properties of the high entropy alloys.[0003]2. Description of the Related Art[0004]Marine organisms, such as various types of plankton, algae, shellfish, etc. attach to water contacting parts of marine structures. When the amount of organisms attached to a marine structure or ship increases, there is an increase in the weight of the marine structure or ship and an increase in the surface area of portions thereof which are exposed to water pressure due to ocean waves, and thus the functionality of the marin...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22F1/10B21D11/14C22C30/00
CPCC22F1/10B21D11/14C22C30/00
Inventor KIM, HYOUNG SEOPAHN, DONG HYUNLEE, SUNG HAKJOO, SOO HYUNLEE, BYEONG JOONA, YOUNG SANGHONG, SUN LGMOON, JONG UNJANG, MIN JIHWANG, DONG SOO
Owner POSTECH ACAD IND FOUND
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