A corrosion-resistant free-machining brass alloy, its preparation method and application

By adding elements such as Si, Ni, and Mn to brass alloys to form a composite κ phase, the environmental protection and performance deficiencies of brass alloy materials are solved, achieving excellent machinability, corrosion resistance, and mechanical properties, making it suitable for a variety of industrial applications.

CN121250177BActive Publication Date: 2026-05-26ZHEJIANG HAILIANG
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Patent Information

Application Number
CN202511484056.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-10-16
Publication Date
2026-05-26
Estimated Expiration
2045-10-16

AI Technical Summary

Technical Problem

Existing brass alloy materials suffer from problems such as toxicity and lack of environmental friendliness, insufficient machinability, corrosion resistance, or mechanical properties, making it difficult to meet environmental protection requirements and the needs of high-performance application scenarios.

Method used

By adding elements such as Si, Ni, and Mn and controlling the content of each element, a composite κ phase (Cu, Ni, Mn)5ZnSi is formed, which synergistically improves the machinability, corrosion resistance, and mechanical properties of the alloy and optimizes the microstructure of the alloy.

Benefits of technology

It achieves a comprehensive balance of alloy properties, possesses excellent machinability, corrosion resistance, and mechanical properties, meets environmental protection requirements, and is suitable for a variety of industrial applications.

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Abstract

This invention discloses a corrosion-resistant free-machining brass alloy, its preparation method, and its applications. The corrosion-resistant free-machining brass alloy is composed of the following components by mass percentage: Cu: 58.0~62.5%, Si: 0.3~1.2%, Ni: 0.1~0.5%, Mn: 0.3~0.7%, B: 0.005~0.025%, with the balance being Zn and unavoidable impurity elements, wherein the total content of unavoidable impurity elements is <0.3%. The brass alloy of this invention possesses excellent machinability, corrosion resistance, and mechanical properties, and is lead-free, meeting environmental protection requirements and satisfying the needs of various fields for brass alloy materials.
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Citation Information

Patent Citations

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  • Good-formability environment-friendly brass alloy and manufacturing method thereof

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