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Deleading technique for surface of lead brass and copper alloy

A lead brass and copper alloy technology, applied in the coating process of metal materials, etc., can solve the problems of unstable lead removal effect, low yield and production efficiency, etc.

Active Publication Date: 2007-07-25
中宇厨卫股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the above two lead removal methods are that the lead removal effect is unstable, and the yield and production efficiency are not high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0022] The embodiment discloses a method for washing lead in copper alloy valves, comprising the following steps:

[0023] 1. Basket loading - put the copper alloy valve workpiece (hereinafter referred to as the workpiece) into the basket for easy movement. There is a water inlet and outlet at the bottom of the basket. The arrangement of the workpieces in the basket is compact and not easy to fall or loosen. Handle with care during the process to prevent damage to the surface of the workpiece.

[0024] 2. Degreasing - Prepare a degreasing solution at a ratio of 50 grams of sodium carbonate per liter of water and heat it to 40°C to 100°C, preferably to 55°C to 70°C, such as 65°C, and soak the workpiece in the degreasing liquid 1 to 12 minutes, the preferred soaking time is 2 to 7 minutes. In this step, the degreasing liquid can be prepared as an aqueous solution from one of 845 chemical oil powder, caustic soda, trisodium phosphate, sodium carbonate, sodium orthosilicate, sodi...

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PUM

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Abstract

This invention provides an efficient, rapid and complete method for deleading the surface of lead breass and copper alloy. The method comprises: degreasing the surface of lead breass, acid washing, placing lead breass in cold-washing lead solution for cold-washing lead treatment, performing activation treatment in a neutralization solution, then performing passivation treatment in a passivation solution, cleaning, and drying. The process can completely clean lead on the surface of lead breass and copper alloy. Besides, the process is energy saving, convenient, and high qualification rate.

Description

technical field [0001] The invention relates to a process for removing lead on the surface of leaded brass and copper alloys, the purpose of which is to remove the toxic heavy metal lead in copper alloy products or copper ingots, and prevent secondary pollution caused by copper alloys during use. Background technique [0002] Lead is a toxic heavy metal chemical element, which contains a certain amount of lead in copper alloys or copper ingots. In order to prevent secondary pollution caused by the presence of lead in products made of copper alloys, it is generally necessary to wash them before use. deal with. The Chinese patent CN1316549 announced on October 10, 2001 discloses a process for selectively removing lead from copper alloy tap water pipe fittings and a lead removal solution. Before the finishing step, the treated and washed pipe fittings immersion in a deleading solution containing at least one carboxylic acid selected from the group consisting of formic acid, ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/00C23G5/00C23G1/02C23C22/27
Inventor 蔡开放
Owner 中宇厨卫股份有限公司
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