A Low Lead Dezincification Resistant Brass Alloy Suitable for Casting

A brass alloy and dezincification-resistant technology, applied in the field of brass alloys, can solve the problems of heavy metal precipitation, high content of metal pollutants, health and environmental hazards, etc., and achieve the effect of easy access, wide sources and low price

Active Publication Date: 2017-09-08
JOMOO KITCHEN & BATHROOM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN 102345025B (45) is a further study based on the imperfection of the current domestic DR copper preparation method. Although it meets the excellent anti-dezincification performance, the content of metal pollutants such as lead 1.2-1.5% in its composition is high, and heavy metals are precipitated. Unable to meet the requirements of toxicity tests such as AS / NZS 4020:2005 and GB18145-2014
See also the patent CN 101988164A low-lead anti-dezincification copper alloy. Although it meets the anti-dezincification performance, it needs to add 0.02-0.15% antimony (Sb) to improve metal cutting performance. Antimony (Sb) is one of the toxic heavy metals. It is harmful to health and environmental protection, and cannot meet the requirements of AS 4020:2005, Sb: ≤3μg / L and the stricter GB18145-2014, Sb: ≤0.6μg / L, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The brass alloy of this embodiment is composed of the following components: 62.1% copper (Cu), 0.117% lead (Pb), 0.409% aluminum (Al), 0.055% arsenic (As), 37.02% zinc (Zn), and The amount is impurity. The impurities are iron (Fe), tin (Sn), nickel (Ni), manganese (Mn), sulfur (S), phosphorus (P) and other uncontrollable elements.

[0025] Add copper (Cu) ingots to the induction furnace, raise the temperature to 1050-1150°C, wait until the copper (Cu) ingots are completely melted, then add zinc (Zn) ingots, aluminum (Al) ingots, and lead (Pb) ingots in the above weight ratios in sequence and arsenic (As) ingot to form an alloy liquid, add an appropriate amount of refining agent, stir to make the composition uniform, keep it at 1000°C for 20 minutes, and pour it out of the furnace to form an alloy. The alloy was kept at 450° C. for 4 hours for phase transformation solid solution treatment, and then cooled to room temperature at a rate of 3-8° C. / s to obtain the brass al...

Embodiment 2

[0029] The brass alloy of this embodiment is composed of the following components: 62.9% copper (Cu), 0.134% lead (Pb), 0.516% aluminum (Al), 0.0632% arsenic (As), 36.18% zinc (Zn), and The amount is impurity. The impurities are iron (Fe), tin (Sn), nickel (Ni), manganese (Mn), sulfur (S), phosphorus (P) and other uncontrollable elements.

[0030] Add copper (Cu) ingots into the induction furnace, raise the temperature to 1050-1150°C, wait until the copper (Cu) ingots are completely melted, then add zinc (Zn) ingots, aluminum (Al) ingots, and lead (Pb) ingots in the above weight ratios in sequence and arsenic (As) ingot to form an alloy liquid, add an appropriate amount of refining agent, stir to make the composition uniform, keep it at 1000°C for 20 minutes, and pour it out of the furnace to form an alloy. The alloy was kept at 600° C. for 4 hours for phase transformation solid solution treatment, and then cooled to room temperature at a rate of 3-8° C. / s to obtain the brass...

Embodiment 3

[0034] The brass alloy of this embodiment is composed of the following components: 63.5% copper (Cu), 0.159% lead (Pb), 0.527% aluminum (Al), 0.0612% arsenic (As), 35.61% zinc (Zn), and The amount is impurity. The impurities are iron (Fe), tin (Sn), nickel (Ni), manganese (Mn), sulfur (S), phosphorus (P) and other uncontrollable elements.

[0035] Add copper (Cu) ingots to the induction furnace, raise the temperature to 1050-1150°C, wait until the copper (Cu) ingots are completely melted, then add zinc (Zn) ingots, aluminum (Al) ingots, and lead (Pb) ingots in the above weight ratios in sequence and arsenic (As) ingot to form an alloy liquid, add an appropriate amount of refining agent, stir to make the composition uniform, keep it at 1050°C for 10 minutes, and pour it out of the furnace to form an alloy. The alloy was kept at 520° C. for 4 hours for phase transformation solution treatment, and then cooled to room temperature at a rate of 3-8° C. / s to obtain the brass alloy o...

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Abstract

The invention discloses a low-lead dezincification-resistant brass alloy suitable for casting, which consists of the following components: 62-64% copper (Cu), 0.1-0.25% lead (Pb), 0.4-0.7% aluminum ( Al), 0.05-0.09% arsenic (As), the rest is zinc (Zn) and impurities whose total amount is not more than 0.3wt%. The alloy is kept at 450-600° C. for 3-5 hours for phase transformation solid solution treatment, and then cooled to room temperature at a speed of 3-8° C. / s. The low-lead dezincification-resistant brass alloy suitable for casting of the invention has excellent dezincification resistance, good mechanical properties, and less precipitation of metal pollutants, and is suitable for parts of drinking water systems.

Description

technical field [0001] The invention relates to a brass alloy, in particular to a low-lead dezincification-resistant brass alloy suitable for casting. Background technique [0002] The copper-zinc alloy in the brass material is prone to dezincification corrosion in aqueous solution. At present, the commonly used lead brass HPb59-1 has poor anti-dezincification corrosion performance, and the average dezincification corrosion depth detected by it is 300-600 microns, far exceeding the internationally generally recognized average dezincification depth of brass anti-dezincification corrosion. The standard requirement of exceeding 100 microns is extremely limited when applied to water-rich environments such as drinking water system components. [0003] At present, there are many schemes for improving the dezincification corrosion resistance of brass materials. Patent CN 102345025B (45) is a further study based on the imperfection of the current domestic DR copper preparation met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/04C22C1/02C22F1/08
Inventor 林孝发林孝山束爱云黄志钱陈国煌
Owner JOMOO KITCHEN & BATHROOM
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