A kind of preparation method of anti-dezincification lead-free bismuth arsenic extruded brass rod

A technology of zinc-lead-free bismuth and brass rods, which is applied in the field of preparation of anti-dezincification lead-free bismuth-arsenic extruded solid brass rods, can solve the problems of weakening the anti-dezincification corrosion performance of duplex brass, and improve the resistance to dezincification. Dezincification corrosion performance, improvement of overpotential, and effect of preventing oxidation and burning

CN107805736BActive Publication Date: 2020-09-29龙岩市鸿航金属科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-09-29

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Abstract

The invention relates to the field of copper alloys for the bathroom and kitchen industry and provides a preparing method for an anti-dezincification leadless bismuth arsenic extruded brass rod. The preparing method comprises the step of smelting 61-63% of Cu, 0.5-0.9% of Bi, 0.07-0.12% of As, 0.5-0.8% of Al, 0.08-0.24% of Sn, smaller than 0.1% of Pb, the balance Zn and smaller than or equal to 0.25% of impurities to obtain the solid brass rod by the processes of lead casting and extruding.
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Description

technical field

[0001] The invention relates to the field of copper alloys used in the bathroom and kitchen industry, in particular to a preparation method of a dezincification-resistant lead-free bismuth-arsenic extruded solid brass rod. Background technique

[0002] Lead brass (common grade is HPb59-1) has become the first choice copper alloy material for bathroom and kitchen hardware because of its good casting molding, cutting, grinding and polishing and mechanical properties, and is widely used. The Zn content of this type of brass exceeds 36%, and it is prone to dezincification corrosion during use, especially in marine climate conditions, which directly affects the life of bathroom and kitchen hardware products. Australia has formulated AS2345~2006 "Dezincification resistance of copper alloys", which stipulates that the dezincification layer of brass castings shall not exceed 100μm. However, practice has proved that for general leaded brass (whether processed copper ...

Examples

Embodiment 1

[0027] A dezincification-resistant lead-free bismuth-arsenic brass, consisting of the following raw materials in mass percent: Cu61%, Bi0.5%, As0.07%, Al0.5%, Sn0.08%, Pb0.06%, Zn37 .75% and total 0.04% impurities.

[0028] The preparation method of the above-mentioned dezincification-resistant lead-free bismuth-arsenic extruded solid brass rod includes the step of casting and extruding the above-mentioned molten brass into a solid brass rod. Steps include:

[0029] 1) First add 150kg of pure copper rice into the cored power frequency furnace. The total amount of pure copper rice in the power frequency furnace is 7.5% of the total raw materials. When it is in a semi-molten state, press it into the preheated 0.08% tin ingot, 0.5% bismuth ingot and 0.5% aluminum ingot accounted for the total raw material, fully stirred and allowed to stand for 10 minutes;

[0030] 2) Add the red copper plate required for the batching of the furnace. The red copper plate is standard cathode cop...

Embodiment 2

[0044] A dezincification-resistant lead-free bismuth-arsenic brass, consisting of the following raw materials in mass percent: Cu62%, Bi0.7%, As0.1%, Al0.7%, Sn0.15%, Pb0.09%, Zn36 .12% and total 0.14% impurities.

[0045] The preparation method of the above-mentioned dezincification-resistant lead-free bismuth-arsenic extruded solid brass rod includes the step of casting and extruding the above-mentioned molten brass into a solid brass rod. Steps include:

[0046] 1) First add 200kg of pure red copper rice into the cored power frequency furnace. The total amount of pure red copper rice in the power frequency furnace is 10% of the total raw materials. When it is in a semi-molten state, press it into the preheated 0.15% tin ingot, 0.7% bismuth ingot and 0.7% aluminum ingot accounted for the total raw material, fully stirred and allowed to stand for 10 minutes;

[0047] 2) Add the red copper plate required for the furnace ingredients. The red copper plate is standard cathode c...

Embodiment 3

[0057] A dezincification-resistant lead-free bismuth-arsenic brass, consisting of the following raw materials in mass percent: Cu63%, Bi0.9%, As0.12%, Al0.8%, Sn0.24%, Pb0.02%, Zn34 .84% and a total of 0.08% impurities.

[0058] The preparation method of the above-mentioned dezincification-resistant lead-free bismuth-arsenic extruded solid brass rod includes the step of casting and extruding the above-mentioned molten brass into a solid brass rod. Steps include:

[0059] 1) First add 300kg of pure copper rice into the cored power frequency furnace. The total amount of pure copper rice in the power frequency furnace is 15% of the total raw materials. When it is in a semi-molten state, press it into the preheated 0.24% tin ingot, 0.9% bismuth ingot and 0.8% aluminum ingot accounted for the total raw material, fully stirred and allowed to stand for 10 minutes;

[0060] 2) Add the red copper plate required for the batching of the furnace. The red copper plate is standard cathode...