Lead-free easily-cut tin brass alloy with good corrosion resistance and preparation method of alloy

Abstract

The invention discloses lead-free easily-cut tin brass alloy with good corrosion resistance and a preparation method of the alloy. The alloy comprises the following components by weight percent: 59%-62% of Cu, 0.5%-1.0% of Sn, 0.05%-0.25% of Si, 0.02%-0.10% of As, not less than 0.05% and less than 0.2% of P+Sb+Bi, 0.002%-0.01% of B and the balance of zinc and not more than 0.4% of inevitable impurities. According to the alloy, excellent cutting performance and corrosion resistance of the alloy material are ensured by controlling the silicon-to-tin ratio and the arsenic-to-boron ratio of the alloy material; meanwhile, the impurity content is strictly controlled to be less than 0.4%; the prepared lead-free easily-cut corrosion-resistant tin brass alloy is easy to cut and has high cost performance, the cutting performance is more than 80%, and the dezincification resistance can be controlled to be lower than a maximal dezincification layer of 150 microns and an average dezincification layer of 100 microns.

Description

Technical field: [0001] The invention relates to a lead-free tin brass alloy which is easy to cut and has good corrosion resistance (the maximum dezincification resistance point is below 150 μm) and a preparation method thereof. Background technique: [0002] Sanitary ware and valve industries, since the pipe fittings, valves and other parts in contact with drinking water in the United States in 2014, all need to implement the law of California, that is, the lead content of the material is less than 0.25%, and at the same time put forward the anti-corrosion requirements, that is, the maximum resistance to dezincification More than 200μm, while the maximum anti-dezincification of C46500 material in the United States is above 300μm. Although the C69300 material can meet the requirements of dezincification resistance, it is unacceptable due to high copper content and high production costs. Therefore, how to make tin-brass alloys with a maximum dezincification resistance of no ...

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Problems solved by technology

Although the C69300 material can meet the requirement of dezincification resi

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