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Brass chemical polishing solution and preparation method thereof

A technology of chemical polishing and preparation method, which is applied in the field of metal surface treatment chemical polishing, which can solve the problems of high cost, failure of polishing liquid, and less application, and achieve the effect of fast polishing speed, good polishing effect, and no edge burrs

Inactive Publication Date: 2011-08-31
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(2) Dichromic acid and its salts, due to the use of hexavalent chromium, cause serious environmental pollution, so this type of polishing method is basically not used, and the cost is high, so the industrial application is less and less
(3) Hydrogen peroxide, although there is no environmental pollution, hydrogen peroxide is unstable, especially metal ions such as dissolved copper in the polishing process have a strong catalytic effect on the decomposition of hydrogen peroxide, even if it is added in the polishing solution In the case of stabilizers, the polishing fluid containing hydrogen peroxide has a short service life, and it will decompose violently to make the polishing fluid invalid, and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] The brass chemical polishing solution of the present invention contains in every liter of polishing solution: 130g of persulfate, 250ml of concentrated sulfuric acid of 98wt%, 40ml of concentrated phosphoric acid of 85wt%, 5g of citric acid, 7g of ferrous sulfate of heptahydrate, chlorination Sodium 1g, urea 2g, sodium lauryl sulfate 0.5g, the balance is water.

[0011] The preparation method of brass chemical polishing liquid of the present invention, preparation 1 liter of polishing liquid realizes through following scheme: prepare the water of 400~600ml, add 250ml of 98wt% concentrated sulfuric acid and 40ml of 85wt% concentrated phosphoric acid to this water, fully stir, obtain A mixed acid solution of sulfuric acid and phosphoric acid, and cool the mixed acid solution to below 40°C; then add 5 g of citric acid, 7 g of ferrous sulfate of heptahydrate, 1 g of sodium chloride, 2 g of urea and Dialkyl sodium sulfate 0.5g, fully stirred to dissolving; Then add persulfat...

Embodiment 2

[0014] The brass chemical polishing solution of the present invention contains in every liter of polishing solution: persulfate 130g, 93wt% concentrated sulfuric acid 263ml, 85wt% concentrated phosphoric acid 40ml, citric acid 5g, ferrous sulfate 7g of heptahydrate, chlorination Sodium 1g, urea 2g, sodium lauryl sulfate 0.5g, the balance is water.

[0015] The preparation method of brass chemical polishing liquid of the present invention, preparation 1 liter of polishing liquid realizes through following scheme: prepare the water of 400~600ml, add 263ml of 93wt% concentrated sulfuric acid and 40ml of 85wt% concentrated phosphoric acid to this water, fully stir, obtain A mixed acid solution of sulfuric acid and phosphoric acid, and cool the mixed acid solution to below 40°C; then add 5 g of citric acid, 7 g of ferrous sulfate of heptahydrate, 1 g of sodium chloride, 2 g of urea and Dialkyl sodium sulfate 0.5g, fully stirred to dissolving; Then add persulfate 130g, fully stir ag...

Embodiment 3

[0018] Brass chemical polishing liquid of the present invention, containing in every liter of polishing liquid: persulfate 60g, the vitriol oil 200ml of 98wt%, citric acid 1g, the ferrous sulfate 2g of Heptalysine, sodium lauryl sulfate 0.2g, The balance is water.

[0019] The preparation method of brass chemical polishing liquid of the present invention, preparation 1 liter of polishing liquid realizes through following scheme: prepare the water of 400~600ml, add 200ml of 98wt% concentrated sulfuric acid in this water, fully stir, obtain sulfuric acid solution, and this Cool the sulfuric acid solution to below 40°C; then add 1 g of citric acid, 2 g of ferrous sulfate of Heptahydrate, and 0.2 g of sodium lauryl sulfate to the sulfuric acid solution, and stir until dissolved; then add 60 g of persulfate, Stir fully again to obtain a finished solution, add water to the finished solution until the total volume is 1 liter, and stir evenly to obtain the brass chemical polishing sol...

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PUM

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Abstract

The invention discloses a brass chemical polishing solution and a preparation method thereof, and one liter of the polishing solution contains 60-140g of persulfate, 200-350ml of 92.5 wt%-98.0 wt% concentrated sulfuric acid, 0-60ml of 85.0wt% strong phosphoric acid, 1-10g of citric acid, 2-10g of 7.H2O ferrous sulfate, 0-3g of sodium chloride, 0-6g of urea, 0.2-1.0g of sodium lauryl sulfate and balance of water. The invention adopts persulfate (kalium, sodium, ammonium and the like) as an oxidant to replace strong nitric acid, hydrogen peroxide and the like adopted for traditional chemical polishing, avoiding using the oxidant harmful to the environment and generating nitrogen oxide gas with strong toxicity for humans in the prior art; the brass chemical polishing solution has the characteristics of environmental protection, more stability (greatly improved by being compared with the stability of a hydrogen peroxide polishing solution), high polishing speed, good polishing effect andthe like. The brass polished through the brass chemical polishing solution has a flat and smooth surface and golden appearance.

Description

Technical field [0001] The invention relates to the field of metal surface treatment and chemical polishing, specifically to brass chemical polishing liquid and its preparation method. Background technique [0002] Brass (copper mass content between 65% and 85%) is a widely used metal material in manufacturing industries such as daily hardware, handicrafts, electrical instruments and mechanical accessories. Polishing is generally required to achieve a decorative appearance. Compared with mechanical polishing and electrochemical polishing, the biggest advantage of chemical polishing is that it does not require a power supply and can process products with complex shapes and different materials. It is especially suitable for small parts with complex geometric shapes and has good polishing uniformity; the equipment and It has simple operation, low investment and strong adaptability; it can polish many workpieces at the same time, is suitable for mass production, and is mainly u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F3/06
Inventor 王森林张艺
Owner HUAQIAO UNIVERSITY
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