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Pickling technology for brass surface passivation pretreatment

A pretreatment and process technology, applied in the field of pickling process of brass surface passivation pretreatment, can solve the problems of harmful operator's health, uneven color, poor film uniformity, etc., to achieve stable pickling process, good effect

Inactive Publication Date: 2014-12-31
无锡杨市表面处理科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But putting the sealing treatment in the last process will make the uniformity of the film worse, the color will be uneven, and affect the appearance quality of the product. Not only that, because the sealing treatment must be carried out at high temperature in the last process, it will cause Some dilute chromic acid vapor will pollute the environment and be harmful to the health of operators

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] A kind of pickling process for the pretreatment of brass surface passivation, the composition of the pickling liquid that this process adopts is: 70% sulfuric acid 370ml / L, 85% phosphoric acid 220ml / L, acetic acid 120ml / L, oxalic acid 24g / L, benzene Triazole 3g / L, 1-phenyl-5-mercaptotetrazolium 2g / L, gelatin 2g / L, polyethylene glycol 5g / L, hydrogen peroxide 20ml / L, OP-1026ml / L, the balance is water The pickling process is: 1) degreasing the brass workpiece normal temperature cleaning agent, then rinse with water, 2) prepare the pickling solution with the above composition, dilute it in the pickling tank according to 1:1.5 during use, and then put The brass workpiece treated in step 1) is placed in the pickling tank, the temperature of the pickling solution is controlled at 35°C, the pickling time is 40s, and then rinsed with water.

Embodiment 2

[0012] A kind of pickling process of brass surface passivation pretreatment, the composition of the pickling liquid that this process adopts is: 70% sulfuric acid 390ml / L, 85% phosphoric acid 180ml / L, acetic acid 140ml / L, oxalic acid 20g / L, benzene Triazole 5g / L, 1-phenyl-5-mercaptotetrazolium 1g / L, gelatin 4g / L, polyethylene glycol 3g / L, hydrogen peroxide 24ml / L, OP-1022ml / L, the balance is water The pickling process is: 1) degreasing the brass workpiece normal temperature cleaning agent, then rinse with water, 2) prepare the pickling solution with the above composition, dilute it in the pickling tank according to 1:2 during use, and then put The brass workpiece treated in step 1) is placed in the pickling tank, the temperature of the pickling solution is controlled at 25°C, the pickling time is 60s, and then rinsed with water.

Embodiment 3

[0014] A pickling process for pretreatment of brass surface passivation, the pickling solution used in the process consists of: 70% sulfuric acid 380ml / L, 85% phosphoric acid 200ml / L, acetic acid 130ml / L, oxalic acid 22g / L, benzene Triazole 4g / L, 1-phenyl-5-mercaptotetrazolium 1.5g / L, gelatin 3g / L, polyethylene glycol 4g / L, hydrogen peroxide 22ml / L, OP-1024ml / L, the balance is water; the pickling process is: 1) degreasing the brass workpiece normal temperature cleaning agent, then rinse with water, 2) prepare the pickling solution with the above composition, dilute it in the pickling tank according to 1:1.8 during use, and then Put the brass workpiece treated in step 1) in the pickling tank, control the temperature of the pickling solution to 30°C, pickling time is 50s, and then rinse with water.

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PUM

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Abstract

The invention discloses a pickling technology for brass surface passivation pretreatment. A pickling solution adopted by the technology comprises 370-390ml / L of 70% sulfuric acid, 180-220ml / L of 85% phosphoric acid, 120-140ml / L of acetic acid, 20-24g / L of oxalic acid, 3-5g / L of benzotriazol, 1-2g / L of 1-phenyl-5-mercaptotetrazole, 2-4g / L of gelatin, 3-5g / L of polyethylene glycol, 20-24ml / L of hydrogen peroxide, 22-26ml / L of OP-10, and the balance of water. The pickling technology comprises the following steps: 1, removing oil from a brass workpiece by using a cleaning agent at room temperature, and flushing the oil removed brass workpiece by clear water; and 2, preparing the pickling solution, diluting the pickling solution in a pickling tank according to a ratio of 1:1.5-2, placing the brass workpiece is the pickling tank, pickling at a temperature of the pickling solution of 25-35DEG C for 40-60s, and flushing the pickled brass workpiece by clear water.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to a pickling process for passivation pretreatment of the surface of brass. Background technique [0002] Copper and brass are easily rusted in the atmosphere. For a long time, people have generally used chromic acid passivation process for surface treatment to improve the surface corrosion resistance of copper and brass. Although the appearance of the product treated by this process is golden yellow and has good corrosion resistance, a large amount of chromate or chromium trioxide is used in this process, and the total amount of hexavalent chromium added is as high as about 250 g / Lift. According to medical data reports, hexavalent chromium is a strong carcinogen, which can also cause respiratory ulcers, perforation of nasal septum, toxic hepatitis, dermatitis, anemia and other diseases, which is very harmful to human health. The allowable discharge of toxic substances ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/10
Inventor 潘增炎
Owner 无锡杨市表面处理科技有限公司
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