Lead-free copper alloy for casting and preparation method thereof

Abstract

The invention discloses a lead-free copper alloy for casting. The lead-free copper alloy is prepared from the following components in percentage by weight: 50-54wt% of Cu, 18-23wt% of Mn, 0.4-0.8wt% of Al, 0.5-1.0wt% of Fe, 0.001-0.2wt% of metamorphic element and the balance of Zn and inevitable impurities, wherein the metamorphic element is at least one of B, Ti, Zr and a rare earth element. Theinvention further discloses a preparation method of the lead-free copper alloy for casting. The lead-free copper alloy for casting meets the multi-dimensional comprehensive requirements of bathroom faucets and valves on cost, cutting machining performance, casting forming performance, corrosion resistance, mechanical properties and the like, and has a great application prospect.

Description

technical field [0001] The invention belongs to the technical field of copper alloys, and in particular relates to a lead-free copper alloy for casting and a preparation method thereof. Background technique [0002] Leaded brass is widely used in the production of faucet bodies, connecting fittings, valves and other products in the plumbing and sanitary industry. However, the lead in the brass in the drinking water system will leach out in the water, endangering human health. Therefore, all countries in the world have promulgated relevant laws and regulations to strictly limit and prohibit the use of lead brass. The key technology to research and develop lead-free brass is to use other elements to replace lead to solve the contradiction between brass cutting performance and usability. For example, the free cutting performance of lead-free brass can be improved by adding bismuth, silicon, antimony, magnesium, tellurium, etc. instead of lead. [0003] At present, these lead...

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Problems solved by technology

[0003] At present, these lead-free materials have been applied in industry to a certain extent, but the copper content used in these materials is generally above 59wt%, or other more expensive elements are added, so that the cost of the final product is significantly higher than that of traditional leaded brass products

If the copper content in the copper alloy is simply reduced, such as reducing the copper content to below 55wt%, it will inevitably increase the zinc content in it, resulting in the material becoming hard and brittle, with insufficient casting performance, machinability, plasticity, and durability. Corrosion performance is severely degraded

[0004] In short, the existing lead-free brass cannot meet the various requirements of sanitary faucets and valves on cost, machining performance, casting performance, corrosion resistance, mechanical properties, etc.

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