Corrosion resistant CuZn alloy

Patent metadata

Field	Value
Publication number	US-12006563-B2
Application number	US-201816346349-A
Country	US
Kind code	B2
Filing date	Sep 25, 2018
Priority date	Nov 15, 2017
Publication date	Jun 11, 2024
Grant date	Jun 11, 2024

Abstract

The present invention provides a corrosion-resistant CuZn alloy, the alloy having a Zn content of from 15 to 55% by mass, the balance being Cu and inevitable impurities, wherein a total content of Zn and Cu is 99.995% by mass or more, and wherein a number of pores is 1/cm 2 or less based on optical microscopic observation.

First claim

What is claimed is:

1. A CuZn alloy, the alloy having a Zn content of from 15 to 55% by mass, the balance being Cu and inevitable impurities,
the CuZn alloy consisting of
(i) a total content of Zn and Cu is 99.995% by mass or more,
(ii) a number of pores is 1/cm 2 or less based on optical microscopic observation, and
(iii) a content of P of 0.01 ppm or less, and
wherein the CuZn alloy has a weight loss of less than 2 mg/cm 2 after 60 minutes of feeding a 10 mm×10 mm×10 mm sized sample into 500 mL of aqueous fluonitric acid solution at 25° C., said aqueous fluonitric acid solution is a solution prepared by mixing 20 mL of 46% hydrofluoric acid, 60 mL of 65% nitric acid, and 420 mL of pure water;
wherein the CuZn alloy is subjected to hot forging where the CuZn alloy is drawn in a longitudinal direction so as to reduce a cross sectional area of an ingot to 60 to 80% of the original cross sectional area at a temperature in a range of from 600 to 900° C.;
wherein after the hot forging step the CuZn alloy is subjected to hot isotropic pressing at a temperature in a range of from 450 to 650° C. for 1 to 8 hours under a pressure of from 100 to 200 MP;
wherein the CuZn alloy is subjected to the hot forging step and hot isotropic step without being subjected to extrusion; and
wherein after the hot isotropic pressing step, the CuZn alloy is subjected to annealing at a temperature in a range of from 500 to 700° C. for 0.5 to 4 hours by air cooling or furnace cooling.

2. The CuZn alloy according to claim 1 , wherein the total content of Zn and Cu is 99.999% by mass or more.

3. The CuZn alloy according to claim 1 , wherein the CuZn alloy is an alloy for electrodes.

4. The CuZn alloy according to claim 1 , wherein the number of pores having a pore diameter of 10 μm or more is 0.1/cm 2 or less based on an optical microscopic observation.

5. The CuZn alloy according to claim 1 , wherein the CuZn alloy has a content of S of less than 0.05 ppm, a content of Fe of less than 5 ppm, a content of Co of less than 0.05 ppm, a content of Ni of less than 0.1 ppm, a content of As of less than 0.005 ppm, a content of Rh of less than 1 ppm, a content of Ag of less than 1 ppm, a content of Sn of less than 0.5 ppm, a content of Sb of less than 0.005 ppm, a content of Te of less than 0.05 ppm, a content of TI of less than 3 ppm, a content of Pb of less than 10 ppm.

6. The CuZn alloy according to claim 3 , wherein the total content of Zn and Cu is 99.999% by mass or more.

7. The CuZn alloy according to claim 4 , wherein the CuZn alloy is an alloy for electrodes.

8. The CuZn alloy according to claim 2 , wherein the number of pores having a pore diameter of 10 μm or more is 0.1/cm 2 or less based on an optical microscopic observation.

9. The CuZn alloy according to claim 2 , wherein the CuZn alloy has a content of S of less than 0.05 ppm, a content of Fe of less than 5 ppm, a content of Co of less than 0.05 ppm, a content of Ni of less than 0.1 ppm, a content of As of less than 0.005 ppm, a content of Rh of less than 1 ppm, a content of Ag of less than 1 ppm, a content of Sn of less than 0.5 ppm, a content of Sb of less than 0.005 ppm, a content of Te of less than 0.05 ppm, a content of TI of less than 3 ppm, a content of Pb of less than 10 ppm.

Assignees

• Jx Nippon Mining & Metals Corp
• Jx Metals Corp

Inventors

• Takahata Masahiro

Classifications

• C22F1/00

  Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working (apparatus for mechanical working of metal B21, B23, B24) · CPC title

• C22C1/02

  by melting {(C22C1/1036 takes precedence)} · CPC title

• C21D8/06

  during manufacturing of rods or wires · CPC title

• H01M4/244

  Zinc electrodes · CPC title

• H01S3/2256

  KrF, i.e. krypton fluoride is comprised for lasing around 248 nm · CPC title