Brass surface chemical blackening method

A surface chemical and brass technology, which is applied in the coating process of metal materials, etc., can solve the problems of strict processing requirements, poor environment, poor bonding force of blackened film, etc., and achieve simple process flow, low cost and strong bonding force Effect

Inactive Publication Date: 2016-12-14
SHENYANG LIGONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are certain defects in each system, such as: the color of the film layer treated by the sulfide system is not ideal; the reaction of the thiosulfate system needs to be heated and the reaction is slow; The color of the film layer obtained by this method is better and has a good bonding force
In recent years, some people use selenite-copper sulfate blackening solution to blacken copper parts at room temperature, but the disadvantage is that the pretreatment requirements are stricter and the bonding force of the blackening film is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Weigh 30.0000g of basic copper carbonate and add water to make a paste, then add 60.0000g of sodium hydroxide to dissolve in water, wait until the temperature drops to room temperature, at this time there is precipitation in the solution, add 80.0000g of ammonium bicarbonate, and keep stirring until precipitation Dissolve completely, add water to make up to 1000 mL; adjust the pH value to 10, and let stand for 2 hours;

[0038] 2) Weigh 50g of sodium hydroxide, 20g of sodium carbonate, 50g of sodium phosphate, and 8g of sodium silicate, dissolve them in water in turn, add water to make up to 1000mL;

[0039] 3) Measure 700mL of hydrogen peroxide, then add 150g of ethylene glycol, 40g of concentrated sulfuric acid, 2mL of OP-10, and add water to make up to 1000mL;

[0040] 4) Slowly add 10mL of concentrated sulfuric acid into water, cool to room temperature, add water to dilute to 1000mL;

[0041] 5) Weigh 0.5g of benzotriazole, 2g of sodium lauryl sulfate and dissol...

Embodiment 2

[0049] 1) Weigh 40.0000g of basic copper carbonate and add water to make a paste, then add 70.0000g of sodium hydroxide to dissolve in water, wait until the temperature drops to room temperature, at this time there is precipitation in the solution, add 95.0000g of ammonium bicarbonate, and stir continuously until precipitation Completely dissolve, add water to make up to 1000 mL; adjust the pH value to 10.5, and place it for 2.5 hours;

[0050] 2) Weigh 40g of sodium hydroxide, 15g of sodium carbonate, 40g of sodium phosphate, and 5g of sodium silicate and dissolve them in water in turn, add water to make up to 1000mL;

[0051] 3) Measure 600mL of hydrogen peroxide, then add 120g of ethylene glycol, 30g of concentrated sulfuric acid, 1mLOP-10, and add water to make up to 1000mL;

[0052] 4) Slowly add 10mL of concentrated sulfuric acid into water, cool to room temperature, add water to dilute to 1000mL;

[0053] 5) Weigh 0.1g of benzotriazole, 1g of sodium lauryl sulfate diss...

Embodiment 3

[0061] 1) Weigh 50.0000g of basic copper carbonate and add water to make a paste, then add 800.0000g of sodium hydroxide to dissolve in water, wait until the temperature drops to room temperature, at this time there is precipitation in the solution, add 120.0000g of ammonium bicarbonate, and keep stirring until precipitation Dissolve completely, add water to make up to 1000 mL; adjust the pH value to 11, and let stand for 3 hours;

[0062] 2) Weigh 5045g of sodium hydroxide, 18g of sodium carbonate, 46g of sodium phosphate, and 7g of sodium silicate and dissolve them in water in sequence, and add water to make the volume to 1000mL;

[0063] 3) Measure 670mL of hydrogen peroxide, then add 135g of ethylene glycol, 35g of concentrated sulfuric acid, 3mL of OP-10, add water to 1000mL;

[0064] 4) Slowly add 10mL of concentrated sulfuric acid into water, cool to room temperature, add water to dilute to 1000mL;

[0065] 5) Weigh 0.3g of benzotriazole, 1.8g of sodium lauryl sulfate ...

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PUM

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Abstract

The invention discloses a brass surface chemical blackening method. The core is that brass is reacted with blackening liquid to form a layer of black oxide film on the surface. Firstly, a brass basal body is deoiled, polished, activated and cleaned; then, the brass basal body is put in the blackening liquid consisting of copper salt and ammonium salt, and is reacted with solution at a room temperature; and after the black film layer with uniform and stable color is generated on the surface of the brass, the brass basal body is taken out for related subsequent treatment to prevent pollution of the surface of the film layer. The brass surface chemical blackening method has the following advantages: the process is simple in flow; the cost is low; the prepared film layer is high in corrosion resistance and bonding force; and the decorating and corrosion resisting effects are excellent.

Description

technical field [0001] The invention belongs to the technical field of surface treatment, in particular to a method for chemically blackening the surface of brass to prepare a corrosion-resistant and functional protective layer. Background technique [0002] Copper-zinc alloy, also known as brass, has a wide range of strength and plasticity, good mechanical properties and casting properties, and is widely used in material processing, workpiece manufacturing, and handicraft production. However, ordinary binary brass is easy to oxidize and change color, and its corrosion resistance is poor in high-temperature and high-humidity environments. In addition, in the field of decoration, due to the upgrading of products and the needs of exports in recent years, the single color of brass is far from being sufficient for production. Requirements; so surface treatment is often carried out during use, and it plays the role of decoration and anticorrosion at the same time. [0003] The b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/63C23C22/73C23G1/20C23F3/06C23C22/83
CPCC23C22/63C23C22/73C23C22/83C23F3/06C23G1/20
Inventor 魏守强刘聘邵忠才
Owner SHENYANG LIGONG UNIV
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