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A bismuth brass alloy

A bismuth brass and alloy technology, applied in the field of non-ferrous metals, can solve problems such as poor corrosion resistance, achieve the effects of improving corrosion resistance, improving mechanical properties, and increasing corrosion potential

Active Publication Date: 2021-04-30
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aiming at the problem of poor corrosion resistance of bismuth brass and excessive precipitation of elements in water, the present invention proposes a bismuth brass material with good corrosion resistance. Through alloying design, the corrosion resistance of bismuth-containing brass is improved, especially the Element corrosion performance, meeting the requirements of the water heating system for the precipitation of material elements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A bismuth brass alloy, its composition and mass percentage are: Cu 58%, Bi 0.2%, Ni 0.5%, Sn 1.5%, Mn 0.02%, Fe 0.02%, Si 0.01%, P 0.1%, impurity elements Content <0.05%, the balance is Zn. The preparation method of the above-mentioned bismuth brass alloy includes: according to the formula mass ratio, use 10wt% (based on the total mass of all raw materials) bismuth-containing cutting brass old material, and add Bi, Cu, Ni, Sn, Zn according to the proportion , Mn, Si and Fe simple substances and Cu-P master alloy, smelting at 1050-1100 ° C for 30 minutes to obtain bismuth brass alloy. The strength of the prepared brass alloy material exceeds 400 MPa, and the dezincification corrosion depth is 60 μm. The amount of elemental precipitation meets the requirements of the national "Standards for Hygienic Safety Evaluation of Drinking Water Transmission and Distribution Equipment and Protective Materials" (2001).

Embodiment 2

[0016] A bismuth brass alloy, its composition and mass percentage are: Cu 65%, Bi 2.5%, Ni 1.2%, Sn 0.05%, Mn 1.8%, Fe 0.3%, Si 0.03%, P 0.005%, impurity Element content <0.05%, the balance is Zn. The preparation method of the above-mentioned bismuth brass alloy includes: according to the formula mass ratio, use 10wt% (based on the total mass of all raw materials) bismuth-containing cutting brass old material, and add Bi, Cu, Ni, Sn, Zn according to the proportion , Mn, Si and Fe elemental substances and Cu-P master alloy, smelting at 1050-1100°C for 30 minutes to obtain a bismuth brass alloy. The strength of the prepared brass alloy material exceeds 400MPa, and the dezincification corrosion depth is 60μm. The amount of elemental precipitation meets the requirements of the national "Standards for Hygienic Safety Evaluation of Drinking Water Transmission and Distribution Equipment and Protective Materials" (2001).

Embodiment 3

[0018] A bismuth brass alloy, its composition and mass percentage are: Cu 63%, Bi 1.4%, Ni0.8%, Sn0.6%, Mn 0.4%, Fe0.05%, Si 0.03%, P 0.01%, Impurity element content <0.05%, Zn balance. The preparation method of the above-mentioned bismuth brass alloy includes: according to the formula mass ratio, use 10wt% (based on the total mass of all raw materials) bismuth-containing cutting brass old material, and add Bi, Cu, Ni, Sn, Zn according to the proportion , Mn, Si and Fe elemental substances and Cu-P master alloy, smelted at 1050-1100°C for 30 minutes to obtain a bismuth brass alloy, the strength of the prepared brass alloy material exceeds 400MPa, the dezincification corrosion depth is 50μm, and the amount of element precipitation Meet the requirements of the national "Drinking Water Transmission and Distribution Equipment and Protective Materials Hygienic Safety Evaluation Standards" (2001).

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Abstract

The invention provides a bismuth brass alloy, which is characterized in that its composition and mass percentage are: Cu 58-65%, Bi 0.2-2.5%, Ni 0.5-1.2%, Sn 0.05-1.5%, Mn 0.02- 1.8%, Fe 0.02‑0.3%, Si 0.01‑0.03%, P 0.005‑0.1%, impurity element content <0.05%, and the balance is Zn. The material of the invention is corrosion-resistant, can use old brass materials containing relatively high content of bismuth, and has low cost.

Description

technical field [0001] The invention relates to a corrosion-resistant bismuth brass alloy, in particular provides a bismuth brass formula for improving the corrosion resistance of bismuth brass, and belongs to the field of nonferrous metals. Background technique [0002] In China, drinking water system components are mostly made of free-cutting brass materials, and the solid lubrication of some elements in free-cutting copper is used to improve processing productivity, improve surface quality, and reduce costs. In the field of lead-free free-cutting brass, bismuth brass dominates and is the most researched and most widely used type of lead-free brass in the market. However, some elements in pipes and valves made of bismuth brass, such as bismuth, zinc, etc., enter the water as the water is washed, soaked, or react with other substances in the water, and are ingested by the human body. In bismuth brass, due to the potential difference between bismuth, zinc and other elements...

Claims

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Application Information

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