Stainless steel electrochemical colouring method

A stainless steel and electrochemical technology, applied in the field of stainless steel electrochemical coloring, can solve the problems of affecting the health of workers, central nervous system toxicity, and rapid failure of the treatment solution, and achieve the effects of stable color, health benefits and low cost.

Inactive Publication Date: 2005-10-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The alkaline high-temperature chemical method needs to be colored at a temperature above 100°C, the solution evaporates quickly, the production environment is harsh, and contains toxic substances nitrite and high-concentration hot alkali, which poses a serious threat to the health of workers; the acidic chemical coloring method also needs to be used at 80 For high temperature above ℃, use 2.5mol L -1 Chromic acid+5.0mol·L -1 The mixed acid solution of sulfuric acid is used for coloring treatment, which has problems such as harsh production environment, rapid failure of the treatment solution and high cost of waste acid treatment.
[0005] Whether it is chemical coloring method or electrochemical coloring method, if the coloring process contains chromic acid, there is a pollution problem of hexavalent chromium: a large amount of waste water is formed during the rinsing process, and hexavalent chromium has a great impact on the skin, mucous membranes and respiratory system of the human body. It is irritating and corrosive, has a toxic effect on the central nervous system, and is highly carcinogenic, seriously affecting the health of the staff

Method used

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  • Stainless steel electrochemical colouring method
  • Stainless steel electrochemical colouring method
  • Stainless steel electrochemical colouring method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The first step is to pre-treat the 1Cr18Ni9 austenitic stainless steel plate for decoration, including degreasing; hot water washing; flowing cold water washing; activation; flowing cold water washing;

[0028] The second step is to place the coloring solution in the electrolytic cell, place the stainless steel semi-finished product in the coloring solution for coloring treatment, the anode is stainless steel, and the cathode is the colored stainless steel semi-finished product. Control coloring current 0.06A / dm 2 ;The electrolytic coloring time is 4 minutes; heated to the required coloring temperature of 42°C in a constant temperature water bath (controlled by a temperature controller); the coloring solution is an aqueous molybdate solution with a content of 25g / L, and dihydrogen phosphate is added at 12.5g / L salt, adjust the pH of the coloring solution to 6.5 with sulfuric acid;

[0029] The third step is to wash the colored stainless steel semi-finished products in ...

Embodiment 2

[0035] Electrochemical coloring was carried out according to the process conditions of Example 1. When the coloring time is 7.0 minutes, the color obtained is uniform and bright brown; when the coloring time is 10.0 minutes, the color obtained is uniform and bright brown-black; when the coloring time is 15.0 minutes, the color obtained is uniform and bright Jet black; when the coloring time is 60.0 minutes, the color obtained is uniform and bright deep black. The film layer is rubbed with an eraser at a 45° angle, and it will not fade after more than 1500 times, and the more you rub it, the brighter it is.

Embodiment 3

[0037] Adjust coloring current density to 0.10A / dm 2, and the rest are electrochemically colored according to the process conditions of Example 1. When the coloring time is 10 seconds, a uniform and bright blue-purple color is obtained; when the coloring time is 20 seconds, a uniform and bright silver gray is obtained; when the coloring time is 30 seconds, a uniform and bright golden yellow is obtained; when the coloring time is 40 seconds , Obtain a uniform and bright color interference film, which is yellow-green when viewed vertically, blue when viewed at an angle of 45°, and purple when viewed horizontally at about 180°; when the coloring time is 50 seconds, a uniform and bright color interference film is obtained, and when viewed vertically It is golden yellow, blue when observed at a 45° angle, and purple when viewed horizontally at about 180°. It can be seen that the color types of the coloring are more than those of the conventional coloring, and the uniformity and br...

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Abstract

This invention is a kind of electro-chemstry staining method of non-corrosive steel. Firstly, pre-treatment for the semi-manufactured non-corrosive steel is essential. Molybdate water solution of 5.0-200 g/L is filled in the electrolytic bath as staining solution, and then the semi-manufactured non-corrosive steel is put into the solution to be stained. The staining electricity should be controlled between 0.02A/square decimeter and 0.6A/square decimeter, while the staining time is between 10 seconds and 60 minutes. At the same time, the temperature should be controlled between 15deg.C and 60 deg.C. After stained, the semi-manufactured non-corrosive steel is water-scrubbed. Then through desiccation, we can get stained non-corrosive steel. To sum up, the staining solution in this invention has no toxicity, has little pollution and power cost, so it does no harm to the workers' health. The technology is easy, and the stained color is stable and has high authenticity. What's more, the cost of the solution is low. You can get multi-colored, homogeneous and highly brightened product.

Description

technical field [0001] The invention relates to the technical field of electrochemical coloring of stainless steel used in buildings, household appliances, automobiles and decorations, in particular to a method for electrochemical coloring of stainless steel. Background technique [0002] The industrial production of colored stainless steel originated in 1973 from the British company INCO. The company mainly used high-concentration chromic acid and sulfuric acid solutions and dipped stainless steel at a medium temperature of 80 ° C. By controlling the length of dipping time, different thicknesses were formed on the surface. Cr 2 o 3 Oxide film. The film itself is translucent, and the light waves reflected by its surface interfere with the light waves reflected by the stainless steel surface after passing through the film layer. By effectively controlling the film thickness, products with different interference colors can be produced. Nippon Steel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D9/12
Inventor 罗韦因徐金来刘钧泉吴成宝
Owner SOUTH CHINA UNIV OF TECH
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