Bismuth brass alloy with good plasticity and corrosion resistance

A corrosion-resistant, bismuth-brass technology, applied in the fields of bismuth-brass alloy materials, brass alloy formulations and their manufacturing, can solve the problems of difficulty in recycling, inability to use old bismuth-containing materials, good corrosion resistance, etc., and achieve comprehensive performance Good, low cost, good processing performance

Active Publication Date: 2019-08-13
UNIV OF SHANGHAI FOR SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the difficulty in recycling bismuth brass in the process of using it, and the problem that other types of copper alloys cannot use bismuth-containing old materials, the purpose of the present invention is to provide a bismuth brass material formula and its manufacturing method, through alloying design, improve the bismuth-containing brass material The plasticity of bismuth brass breaks the strict restrictions on the content of bismuth in the smelting of many copper alloys, so that a large amount of old bismuth-containing brass materials can be used. At the same time, the alloy has good corrosion resistance, which provides a new way for the recycling of bismuth-containing brass train of thought

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  • Bismuth brass alloy with good plasticity and corrosion resistance

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Embodiment 1

[0014] A bismuth brass alloy with good plasticity and corrosion resistance, its composition and mass percentage are: Cu 58%, Bi 0.02%, Mg 0.02%, Zr 0.05%, La 0.02%, impurity element content < 0.5%, balance for Zn.

[0015] The preparation method of the above-mentioned bismuth brass alloy with good plasticity and good corrosion resistance is: according to the mass percentage of each component, use 10% (based on the weight sum of each raw material) bismuth-containing cutting brass old material, add elemental Mg, Zr , La, Cu and Zn, adjust the alloy content to the corresponding mass percentage, smelt at 1050-1100°C for 30 minutes, and use other components in the old bismuth brass used in smelting as impurities to obtain a bismuth brass alloy with good plasticity and corrosion resistance . The strength of the prepared brass alloy material exceeds 400 MPa, the hardness HB is 120, the elongation is greater than 20%, and the dezincification corrosion depth is 70 μm.

Embodiment 2

[0017] A bismuth brass alloy with good plasticity and corrosion resistance, its composition and mass percentage are: Cu 75%, Bi 2.5%, Mg 1.8%, Zr 1.5%, La 0.3%, impurity element content < 0.5%, balance for Zn.

[0018] The preparation method of the above-mentioned bismuth brass alloy with good plasticity and good corrosion resistance is: according to the mass percentage of each component, use 10% (based on the weight sum of each raw material) bismuth-containing cutting brass old material, add elemental Bi, Mg , Zr, La, Cu and Zn, adjust the alloy content to the corresponding mass percentage, smelt at 1050-1100°C for 30 minutes, and use other components in the old bismuth brass used in smelting as impurities to obtain bismuth yellow with good plasticity and corrosion resistance copper alloy. The strength of the prepared brass alloy material exceeds 400 MPa, the hardness HB is 120, the elongation is greater than 20%, and the dezincification corrosion depth is 80 μm.

Embodiment 3

[0020] A bismuth brass alloy with good plasticity and corrosion resistance, its composition and mass percentage are: Cu 58%, Bi 0.02%, Mg 0.02%, Zr 0.05%, La 0.02%, impurity element content < 0.5%, balance for Zn.

[0021] The preparation method of the above-mentioned bismuth brass alloy with good plasticity and corrosion resistance is as follows: according to the mass percentage of each component, use 50% (based on the weight sum of each raw material) bismuth-containing cutting brass old material, add elemental Bi, Mg , Zr, La, Cu and Zn, adjust the alloy content to the corresponding mass percentage, smelt at 1050-1100°C for 30 minutes, and use other components in the old bismuth brass used in smelting as impurities to obtain bismuth yellow with good plasticity and corrosion resistance copper alloy. The strength of the prepared brass alloy material exceeds 400 MPa, the hardness HB is 120, the elongation is greater than 18%, and the dezincification corrosion depth is 80 μm. ...

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Abstract

The invention provides a bismuth brass alloy with good plasticity and corrosion resistance. The bismuth brass alloy is characterized by being prepared from, by mass, 58-75% of Cu, 0.02-2.5% of Bi, 0.02-1.8% of Mg, 0.05-1.5% of Zr, 0.02-0.3% of La, less than 0.5% of impurity elements and the balance Zn. The material is resistant to corrosion, bismuth brass scrap with the higher content can be adopted, and the alloy is good in machining performance and quite low in cost.

Description

technical field [0001] The invention relates to a bismuth brass alloy material with good plasticity and corrosion resistance, in particular provides a brass alloy formula that can use old bismuth brass materials and a manufacturing method thereof, belonging to the field of nonferrous metal processing. Background technique [0002] Bismuth brass is the most researched and most widely used type of lead-free brass in the market. However, bismuth brass also has some problems, the most important of which is that bismuth increases the brittleness of the alloy, resulting in so-called "cold brittleness" and "hot brittleness". Therefore, except for bismuth brass, bismuth is a harmful impurity that is strictly controlled in other types of brass and copper alloys. In addition, the yield of free-cutting bismuth brass is lower than that of traditional lead brass in the process of processing, and the amount of waste generated is large; the processing technology of bismuth brass is more d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/04
CPCC22C9/04
Inventor 潘晟张旭东刘新宽刘平陈小红
Owner UNIV OF SHANGHAI FOR SCI & TECH
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