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Preparation method of pickling solution for brass surface passivation pretreatment

A preparation method and technology of pickling solution, applied in the coating process of metal materials, etc., can solve problems such as uneven color, harmful to the health of operators, and poor film uniformity, so as to achieve good effect and stable pickling process 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

[0011] A kind of preparation method of the pickling solution of brass surface passivation pretreatment, the composition of this pickling solution 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 preparation method of the passivation solution is: add an appropriate amount of water in the reaction kettle, then add sulfuric acid and phosphoric acid, stir until dissolved, then add benzotriazole and 1-phenyl-5 mercaptotetrazolium, stir 6 minutes to make it uniform, then add acetic acid, oxalic acid, gelatin, polyethylene glycol, hydrogen peroxide and OP-10 in sequence, add the latter substance after the former substance is dissolved, stir for 10 minutes after all addition, and then add the remaining Amount of water to volume.

Embodiment 2

[0013] A kind of preparation method of the pickling solution of brass surface passivation pretreatment, the composition of this pickling solution 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 preparation method of the passivation solution is: add an appropriate amount of water in the reaction kettle, then add sulfuric acid and phosphoric acid, stir until dissolved, then add benzotriazole and 1-phenyl-5 mercaptotetrazolium, stir Make it uniform for 10 minutes, then add acetic acid, oxalic acid, gelatin, polyethylene glycol, hydrogen peroxide and OP-10 in sequence, add the latter substance after the former substance is dissolved, stir for 6 minutes after all addition, and then add the remaining Amount of water to volume.

Embodiment 3

[0015] A kind of preparation method of the pickling solution of brass surface passivation pretreatment, the composition of this pickling solution is: 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 preparation method of the passivation solution is: add an appropriate amount of water in the reactor, then add sulfuric acid and phosphoric acid, stir until dissolved, then add benzotriazole and 1-phenyl-5 mercaptotetrazolium, Stir for 8 minutes to make it uniform, then add acetic acid, oxalic acid, gelatin, polyethylene glycol, hydrogen peroxide and OP-10 in sequence, add the latter substance after the former substance is dissolved, stir for 8 minutes after all addition, and then add Make up the remaining water to volume.

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PUM

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Abstract

The invention discloses a preparation method of a pickling solution for brass surface passivation pretreatment. The preparation method of the above passivating solution comprises the following steps: adding a proper amount of water into a reaction kettle, adding sulfuric acid and phosphoric acid, stirring until sulfuric acid and phosphoric acid are dissolved, adding benzotriazol and 1-phenyl-5-mercaptotetrazole, stirring for 6-10min to make the obtained solution uniform, sequentially adding acetic acid, oxalic acid, gelatin, polyethylene glycol, hydrogen peroxide and OP-10 according to a condition that a latter substance is added after a previous substance is dissolved, stirring for 6-10min after all above substances are added, and adding water to a constant volume.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to a method for preparing a pickling solution for passivation pretreatment of brass surfaces. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/10C23C22/78
Inventor 潘增炎
Owner 无锡杨市表面处理科技有限公司
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