Nontarnishing multi-element nickel, tin and brass alloy and preparation method thereof

Abstract

The invention provides a nontarnishing multi-element nickel, tin and brass alloy and a preparation method thereof. The alloy comprises the following components in percentage by mass: 70.0-75.0% of Cu, 0.1-0.6% of Al, 0.5-1.3% of Ni, 0.7-1.5% of Sn, 0.02-0.2% of Si, and 0.05-0.20% of Mn. The alloy also comprises 0.003-0.01% of Cr, 0.003-0.01% of B, 0.005-0.015% of RE, and the balance Zn, wherein Cr, B and Re account for 0.015-0.03% of the total content. The preparation method comprises the steps of smelting, casting, hot rolling, primary rolling, first intermediate annealing, acid pickling, finish rolling low-temperature annealing, and other processing to obtain the material. The nontarnishing multi-element nickel, tin and brass alloy is high in strength, abrasion and corrosion resistance, and can be widely applied to copper-based decorating materials, water pipes and other copper-based spare parts.

Description

technical field [0001] The invention relates to an anti-discoloration multi-component nickel-tin brass alloy and a preparation method thereof, belonging to the field of nonferrous metal processing. Background technique [0002] Architectural decoration has two basic functions: one is to beautify the living environment and create a comfortable living space for human beings; the other is to protect building components. Along with the progress of society, the development of economy and science, new metal decorative materials are constantly emerging, and promote the development of the construction industry with its superior usability and high-tech functionality. Metal decoration materials mainly include steel, copper, aluminum and their alloy materials. Among them, copper has special aesthetic properties and conductive properties, especially the golden yellow of brass alloy, which has a golden color and is widely favored by consumers. At the same time, copper-based metal materi...

AI Technical Summary

Problems solved by technology

Copper has a reddish metallic luster, excellent processing performance and ductility, and is often used as a decorative material for large indoor beautiful parts. However, it is easy to oxidize and change color in artificial sweat and wet environments, and its corrosion resistance is poor, especially in the humid rainy season in the south. Oxidation and discoloration are prone to occur in seasons, and the market application field is limited; brass is a binary alloy with a yellow metallic luster, and is widely used in structural parts and exterior decoration parts in architectural decoration, accounting for about 40% of the application market of copper-based decorative materials , but the zinc content in the brass alloy is about 30%, dezincification corrosion will occur in the humid air, and black spots of oxidation will appear, which will greatly reduce the aesthetic characteristics of the decorative parts. Therefore, in order to improve the brass alloy at home and abroad Excellent corrosion resistance, adding a small amount of Sn element in the alloy, inhibiting the dezincification corrosion of brass, and developing tin brass known as "Navy Brass"

However, due to the thickness of conventional decorative materials ranging from 6 to 20mm, domestic tin brass strips are all produced by horizontal continuous casting, and the tin brass alloy produced by horizontal continuous casting has a coarse structure, and it is difficult to achieve the uniform fineness of semi-continuous + hot billet Therefore, it is difficult to popularize and industrialize tin-brass alloys in the field of decorative applications; white copper is Cu-Ni, Cu-Ni-Zn or BFe10-1-1 alloys, etc., which have good corrosion resistance and are currently used in seawater desalination It has a good application prospect in engineering and other fields, but it contains a high content of nickel and is expensive. In addition, its appearance is white. Compared with golden yellow brass-based alloys, it is less popular in the market and it is difficult to meet the requirements of the high-end market. ; However, due to the conventional copper-based decorative materials' anti-discoloration, corrosion resistance and cost advantages are difficult to meet the market development needs, it is necessary to develop new copper-based decorative materials

[0004] At present, the improvement of the anti-tarnish performance of copper-based decorative materials at home and abroad is mainly from the following two aspects: on the one hand, the surface coating treatment technology is studied to treat the surface, thereby improving its anti-tarnish performance and corrosion resistance, but it will cover up the metallic luster , is a non-optimal choice; on the other hand, a new type of corrosion-resistant copper-based material is studied, and the color of the material is similar to gold, and at the same time it has good oxidation resistance and corrosion resistance, excellent plasticity, and good cold and hot processing formability , coupled with the weak global economy, it is necessary to develop new low-cost alloys to meet the needs of decorative materials, so it will be of great practical significance to develop new copper-based decorative materials with low cost and high resistance to discoloration

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