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Stainless steel coloring liquid and coloring method

A technology of stainless steel and coloring liquid, applied in the direction of anodic oxidation, etc., can solve the problems of cancer, vanadium poisoning, etc., and achieve the effects of good environmental performance, low temperature, good wear resistance and corrosion resistance

Inactive Publication Date: 2013-11-20
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the coloring solution has obvious deficiencies: chromate can cause cancer, vanadate can cause vanadium poisoning, tungstate also has low toxicity

Method used

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  • Stainless steel coloring liquid and coloring method
  • Stainless steel coloring liquid and coloring method

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Experimental program
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Effect test

preparation example Construction

[0031] The preparation method of the coloring liquid is preferably as follows: respectively dissolve the weighed sodium hydroxide, trisodium phosphate and sodium nitrate with a small amount of distilled water, add distilled water to the specified volume after mixing, and make the concentration of each solute reach the above range.

[0032] The invention also discloses a stainless steel coloring method, comprising the following steps:

[0033] The pretreated stainless steel sample is used as the positive electrode, and the lead plate is used as the negative electrode, and the electrolytic coloring is carried out in the stainless steel coloring solution described in the above technical scheme.

[0034] According to the present invention, a pretreated stainless steel sample is firstly provided. The stainless steel is preferably 316, 304 or SUS304 stainless steel. The pretreatment preferably includes in sequence: chemical degreasing, electrolytic polishing and activation. The me...

Embodiment 1

[0045]After chemical degreasing, electropolishing and activation treatment, the 1Cr18 stainless steel is put into the prepared electrolytic coloring solution of the invention as an anode, and the cathode is a lead plate.

[0046] The electrolyte composition is: sodium hydroxide 200g / L, trisodium phosphate 8g / L, sodium nitrate 10g / L;

[0047] The operating parameters of electrolytic coloring are: anode current density 0.3A / dm 2 , the temperature of the water bath is 50° C., and the time is 10 minutes.

[0048] The obtained coloring film is golden yellow, and the surface EDS energy spectrum analysis after electrolytic coloring treatment is as follows: figure 1 As shown, the result shows that its surface layer composition is: 55.68Fe10.06Cr10.04Mn1.66Si22.56O (atomic percentage).

Embodiment 2

[0050] The Japanese SUS304 stainless steel sheet is used, after chemical degreasing, electrolytic polishing and activation treatment, it is put into the prepared electrolytic coloring solution of the invention as an anode, and the cathode is a lead plate.

[0051] Electrolytic coloring process parameters are: sodium hydroxide 500g / L, sodium nitrate 8g / L, potentiostat control voltage 2.2V, water bath temperature 100°C, time 15 minutes.

[0052] The obtained colored film is also golden yellow, and the colored film is smooth, bright and uniform in color.

[0053] The test results prove that the coloring film can withstand the back and forth friction of rubber with a force of 200g for more than 70 cycles without discoloration, and can withstand immersion in 3.5% sodium chloride solution for 480 hours without discoloration.

[0054] figure 2 The EDS energy spectrum analysis of the surface after the coloring treatment shows that the surface layer composition is: 45.64Fe13.70Cr6.74...

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Abstract

The invention provides stainless steel coloring liquid. The stainless steel coloring liquid is characterized in that water is used as a solvent, and a solute comprises 150-550g / L of sodium hydroxide, 1-10g / L of trisodium phosphate and 0-12g / L of sodium nitrate. The invention also provides a coloring method of the stainless steel coloring liquid. The coloring method is characterized in that a pretreated stainless steel sample is used as a positive electrode, a lead plate is used as a negative electrode, and electrolytic coloring is carried out in the stainless steel coloring liquid. The coloring liquid comprises simple ingredients, does not contain harmful heavy metal elements, has better environmental friendliness and is low in cost. In addition, a coloring film formed by using the coloring liquid provided by the invention has good wear resistant property and corrosion resistant property. Further, when the stainless steel sample is subjected to electrolytic coloring, the coloring film obtained by simply adjusting operating parameters according to the change of the solute content in the coloring liquid can take on multiple colors such as light yellow, golden yellow, redness, greenness, navy blue, dark brown and brownness.

Description

technical field [0001] The invention belongs to the field of stainless steel surface treatment, in particular to a stainless steel coloring liquid and a coloring method. Background technique [0002] With the improvement of living standards, stainless steel products continue to be decorative, and people begin to pursue the diversity of stainless steel colors. The research on the coloring of stainless steel started with the INCO method in 1927, that is, CrO 3 —H 2 SO 4 Coloring system, which has been studied more and has a wider range of applications, but the coloring temperature of this method is high, the color reproducibility is not easy to control, and the environmental pollution is very serious. [0003] The Chinese invention patent with the publication number CN103114320A discloses a coloring solution and a coloring method for electrochemical coloring of stainless steel. The coloring solution is composed of: molybdate 30-80g / L, boric acid 10-18g / L, zinc sulfate 2-5g ...

Claims

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Application Information

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IPC IPC(8): C25D11/34
Inventor 周海飞郭鑫周琼吴红雪钱洲亥祝郦伟
Owner STATE GRID CORP OF CHINA
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