Phosphorus containing free-cutting silicon brass alloy and preparation method thereof

Abstract

The invention discloses a phosphorus containing free-cutting silicon brass alloy. The phosphorus containing free-cutting silicon brass alloy is prepared from the following components: 61-64wt% of Cu, 0.5-1.0wt% of Si, 0.4-1.0wt% of Al, 0.01-0.6wt% of P, 0.1-0.15wt% of Pb, 0.01-0.3wt% of Ni, 0.1-1.0wt% of Mg+Sn, less than 0.08 wt% of at least one modificator, and the balance of Zn and impurities, wherein the modificator is B, Ti, Zr or Re, and the total weight percent of the impurities is not more than 0.5wt%. The invention further discloses a preparation method of the phosphorus containing free-cutting silicon brass alloy. The phosphorus containing free-cutting silicon brass alloy disclosed by the invention has excellent dezincification corrosion resistance, also has excellent casting performance and cutting performance, is relatively low in cost and is suitable for components of a drinking water system.

Description

technical field [0001] The invention relates to a brass alloy, in particular to a phosphorus-containing free-cutting silicon brass alloy and a preparation method thereof. Background technique [0002] Lead brass is widely used in electronics and daily hardware industries because of its good cold and hot forming performance, machinability and corrosion resistance. However, the lead content in lead brass is high, which is easy to precipitate and pollute the environment. Especially when used in the drinking water system, it will cause serious harm to the human body. Countries around the world have successively issued corresponding laws and regulations to strictly limit the lead content in copper alloys. my country's GB / T 18145-2014 "Ceramic Sheet Sealed Faucets" also stipulates that the amount of lead precipitated in drinking water system components should be less than 5μg / L , so developing new brass alloys to reduce lead content while maintaining good processing performance ha...

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Problems solved by technology

For example, the Chinese patent No. 94192613.3 "Low Lead Bismuth Brass" applied by Kohler Company of the United States is composed of 55-70wt% Cu, 30-45wt% Zn, 0.2-1.5wt% Bi, 0.2-1.5wt% Al , 0.1 ~ 1.0wt% Pb; the above-mentioned alloys have high Bi content, are prone to hot cracking, and have poor welding performance, so it is difficult for practical application

The published Chinese patent application No. 200580046460.7 "Free-cutting copper alloy containing a very small amount of lead" by Japan's Sambo involves a Cu-Zn-Si brass alloy, which consists of 71.5-78.5wt% Cu, 2.0-4.5wt %Si, 0.005-0.02wt%Pb, and the balance is zinc; the alloy has high Cu content and is expensive, so its market competitiveness is not strong

"Lead-Free Free-cutting Antimony Brass Alloy" invented by Ningbo Powerway Group, its Chinese patent application number is 200410015836.5, consists of 55-65wt% Cu, 0.3-2.0wt% Sb, 0.4-1.6wt% Mn, and other elements are 0.1 ~1.0wt%; the content of antimony in the above-mentioned alloy is relatively high, and its precipitation amount will exceed the limit of 0.6μg / L stipulated in NSF61 and GB / T 18145, so it cannot be popularized and applied in the field of drinking water system

Xiamen Luda's patent application No. 201010117783.3 "An Environmentally Friendly Manganese Brass Alloy and Its Manufacturing Method" discloses a Cu-Zn-Mn brass alloy. Since the manganese content is up to 6.5wt%, the hardness of the alloy is relatively high. High, severe tool wear and poor cutting performance, so it is not suitable for mass production

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