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Environment-friendly technology for copper and copper alloy surface treatment

A surface treatment and copper alloy technology, which is applied in the field of copper and copper alloy surface treatment environmental protection technology, can solve the problems of corrosion resistance and anti-discoloration performance gap, and achieve high salt spray resistance, high anti-discoloration, controllable thickness, and emission less effect

Inactive Publication Date: 2017-05-17
JINTIAN COPPER GROUP CORP NINGBO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention adopts chromium-free passivation treatment, which can improve the corrosion resistance of copper alloy to a certain extent and prolong the surface discoloration time. There is still a big gap between the discoloration performance and chromic acid passivation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The material is HPb59-1, and the environmental protection surface treatment process of the lead brass valve annealed at 270°C is as follows:

[0025] (1) Ultrasonic degreasing

[0026] Add a degreasing agent to an ultrasonic cleaning tank made of stainless steel, dilute it with tap water to a concentration of 5% as a degreasing working fluid, place the above-mentioned lead brass valve in the cleaning tank for degreasing operation, and ultrasonically treat for 3 minutes at room temperature.

[0027] (2) Rinse with clean water

[0028] Put the lead brass valve degreased in step (1) in a stainless steel tank with clean water as the bath liquid, perform rinsing operation, rinse 2 times, and control the conductivity of the rinsing water in the second rinsing tank to not exceed 1000µs.

[0029] (3) Magnetic polishing

[0030] Place the lead brass valve rinsed in step (2) in the stainless steel polishing bucket of the magnetic polishing machine for magnetic polishing. The p...

Embodiment 2

[0042] The material is HBi60-1, and the environmental protection surface treatment process of the lead-free environmental protection brass valve that has been stress-relieved and annealed at 300 °C is as follows:

[0043] (1) Ultrasonic degreasing

[0044] Add degreasing agent to the ultrasonic cleaning tank made of stainless steel, dilute it with tap water to a concentration of 3% as the degreasing working fluid, put the lead-free environmental protection brass valve in the cleaning tank for degreasing operation, and ultrasonically treat for 2 minutes at room temperature .

[0045] (2) Rinse with clean water

[0046] Put the lead-free environmentally friendly brass valve degreased in step (1) in a PVC tank with clean water as the bath liquid, and perform rinsing operation. Rinse 2 times, and control the conductivity of the rinsing water in the second rinsing tank to not exceed 1000µs.

[0047] (3) Magnetic polishing

[0048] Put the lead-free environmentally friendly brass...

Embodiment 3

[0060] The material is HPb59-2, and the environmental protection surface treatment process of the machined lead brass pipe section is as follows:

[0061] (1) Ultrasonic degreasing

[0062] Add degreasing agent to the ultrasonic cleaning tank made of stainless steel, dilute it with tap water to a concentration of 6% as the degreasing working fluid, put the lead brass pipe section in the cleaning tank for degreasing operation, and ultrasonically treat it for 5 minutes at room temperature.

[0063] (2) Rinse with clean water

[0064] Put the lead brass pipe section after degreasing in step (1) in a stainless steel tank with clean water as the bath liquid, and perform rinsing operation. Rinse 2 times, and control the conductivity of the rinsing water in the second rinsing tank to not exceed 1000µs.

[0065] (3) Magnetic polishing

[0066] Put the lead brass pipe section after rinsing in step (2) into the stainless steel polishing bucket of the magnetic polishing machine for mag...

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PUM

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Abstract

The invention discloses an environment-friendly technology for copper and copper alloy surface treatment. The environment-friendly technology includes the following steps of (1) ultrasonic degreasing, (2) rinsing with clear water, (3) magnetic force polishing, (4) rinsing with clear water, (5) surface sealing, (6) centrifugal drying and (7) inspecting and packaging. A magnetic force polishing method is adopted to replace traditional three-acid pickling so as to conduct surface oxide skin removing operation on a copper alloy workpiece, and steel needles continuously collide and rub copper and the copper alloy workpiece so that surface oxide layers and tiny burrs can be removed and the purpose of surface smoothness can be achieved. The size of the copper alloy workpiece is not changed at all before and after treatment, and the poor size problem of the workpiece due to overpickling in the acid pickling process does not exist. A water-soluble environment-friendly sealing agent is adopted, the copper and the copper alloy workpiece with the smoothness surfaces after magnetic force polishing are subjected to sealing treatment, an organic closing membrane is used for replacing a chromic acid passivation membrane so that surface protection can be performed on the copper alloy workpiece, the adopted sealing agent is up to the ROSH standard and does not contain toxic and harmful substances, and the thickness of the surface closing membrane is controllable in the process; and moreover, the product has high fingerprint resistance, high salt spray resistance and high anti-tarnish performance.

Description

technical field [0001] The invention relates to a metal surface treatment process, in particular to an environmental protection process for copper and copper alloy surface treatment. Background technique [0002] Copper and copper alloys, as the second most consumed non-ferrous metals after aluminum alloys, have a wide range of applications. With the improvement of the current economic level, the application fields of copper alloy workpieces (including valves, copper pipe fittings, plumbing, etc.) are becoming wider and wider. Copper and copper alloys have poor corrosion resistance, especially in humid or oxidizing conditions, which are prone to chemical or electrochemical corrosion, which affects the appearance of the product and even causes product quality accidents. [0003] In order to improve the corrosion resistance of copper and copper alloys, pickling-chromic acid passivation surface treatment methods are generally used (except electroplating). This method requires...

Claims

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Application Information

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IPC IPC(8): C23F11/14C23F3/06C23G1/10
CPCC23F3/06C23F11/147C23G1/103
Inventor 傅杰张翼裘桂群巢国辉
Owner JINTIAN COPPER GROUP CORP NINGBO
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