A copper-nickel alloy and a method for producing the same

By introducing microalloying elements and optimizing the preparation process into copper-nickel alloys, the rapid formation of surface films is promoted, which solves the problem of insufficient corrosion resistance of copper-nickel alloys in corrosive salt solutions and achieves a significant improvement in corrosion resistance.

CN117626051BActive Publication Date: 2026-07-24INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Patent Information

Application Number
CN202311821460.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-12-27
Publication Date
2026-07-24
Estimated Expiration
2043-12-27

AI Technical Summary

Technical Problem

Existing copper-nickel alloys exhibit slow surface film formation rates in corrosive salt solutions, resulting in insufficient corrosion resistance, and they are particularly susceptible to erosion corrosion damage in flowing media.

Method used

By introducing microalloying elements such as noble metals Pd and Pt and rare earth elements Y, Sc, and La, the composition of copper-nickel alloys is optimized. Combined with high-vacuum non-consumable arc melting, homogenization annealing, and recrystallization annealing, the rapid formation of surface films is promoted, and the surface reactivity and grain refinement are improved.

Benefits of technology

It significantly improves the surface film formation rate of copper-nickel alloys in corrosive salt solutions, enhances their corrosion resistance, and reduces the erosion corrosion rate by more than 60%.

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Abstract

The application relates to a copper-nickel alloy and a preparation method thereof, and relates to the technical field of alloy materials, and mainly adopts the technical scheme that the copper-nickel alloy comprises the following chemical components in percentage by weight: Ni: 10-30 wt%; Fe: 0-1.8 wt%; Mn: 0-1.0 wt%; micro-alloying elements: 0.05-0.2 wt%; impurity elements: <0.5 wt%; and the balance is Cu; wherein the micro-alloying elements comprise noble metal elements. The application mainly utilizes the synergistic effect of the micro-alloying elements in accelerating the anodic and cathodic reactions of the copper-nickel alloy in a corrosive salt solution and promoting non-uniform deposition nucleation, so that the protective property of a corrosion product film on the surface of the copper-nickel alloy is greatly improved, and the copper-nickel alloy has excellent corrosion resistance, and the erosion corrosion rate is reduced by more than 60% compared with that of the existing copper-nickel alloy.
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