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Production method for chemically coloring low-chromium stainless steel into black

A production method and chemical coloring technology, applied in the fields of metallurgy and chemistry, can solve problems such as high energy consumption, high cost, and high pollution, and achieve low temperature, large concentration range, and good reproducibility

Inactive Publication Date: 2013-04-10
张晓波
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The chromium-iron alloy containing more than 11.7% chromium is called stainless steel; stainless steel has good corrosion resistance, because chromium can effectively reduce the oxidation electrode potential and make the electrode potential change from positive to negative. Most of the existing stainless steel chemical coloring is used Ferrochrome alloy containing more than 13% chromium, adopts high-temperature, high-concentration chromic acid and sulfuric acid process, has defects such as high energy consumption, high pollution, and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In the first step, the low-chromium stainless steel is pre-treated. The pre-treatment solution is composed of 5 g / L sulfuric acid and 150 g / L hydrogen peroxide. The time is 10 minutes and the temperature is 35 degrees Celsius. Take it out and wash it with running water.

[0017] The second step is to carry out chemical coloring treatment to the low-chromium stainless steel after the pretreatment. The formula of the chemical coloring solution is 50 grams / liter of sulfuric acid, 5 grams / liter of nitrate, 10 grams / liter of ammonium sulfate, and 0.1 gram / liter of benzoic acid; 60 degrees Celsius, 40 minutes to start to improve, 60 minutes to get bright black. Take it out and wash it with running water.

[0018] The third step is to seal the low-chromium stainless steel after the chemical coloring treatment, the sealing liquid is distilled water, the temperature is 70 degrees Celsius, and the time is 5 minutes. Remove to dry.

Embodiment 2

[0020] In the first step, the low-chromium stainless steel is pre-treated. The pre-treatment solution is composed of 5 g / L sulfuric acid and 150 g / L hydrogen peroxide. The time is 10 minutes and the temperature is 35 degrees Celsius. Take it out and wash it with running water.

[0021] The second step is to carry out chemical coloring treatment to the low-chromium stainless steel after the pretreatment. The formula of the chemical coloring solution is 60 grams / liter of sulfuric acid, 10 grams / liter of nitrate, 20 grams / liter of ammonium sulfate, and 0.5 grams / liter of benzoic acid; 70 degrees Celsius, 30 minutes to start to improve, 50 minutes to get bright black. Take it out and wash it with running water.

[0022] The third step is to seal the low-chromium stainless steel after the chemical coloring treatment, the sealing liquid is distilled water, the temperature is 70 degrees Celsius, and the time is 5 minutes. Remove to dry.

Embodiment 3

[0024] In the first step, the low-chromium stainless steel is pre-treated. The pre-treatment solution is composed of 5 g / L sulfuric acid and 150 g / L hydrogen peroxide. The time is 10 minutes and the temperature is 35 degrees Celsius. Take it out and wash it with running water.

[0025] The second step is to carry out chemical coloring treatment to the low-chromium stainless steel after the pretreatment. The formula of the chemical coloring solution is 100 grams / liter of sulfuric acid, 10 grams / liter of nitrate, 30 grams / liter of ammonium sulfate, and 1 gram / liter of benzoic acid; 70 degrees Celsius, 35 minutes to start to improve, 45 minutes to get bright black. Take it out and wash it with running water.

[0026] The third step is to seal the low-chromium stainless steel after the chemical coloring treatment, the sealing liquid is distilled water, the temperature is 70 degrees Celsius, and the time is 5 minutes. Remove to dry.

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Abstract

The invention discloses a production method for chemically coloring low-chromium stainless steel into black. In the conventional stainless steel chemical coloring, a chromium-iron alloy of which the chromium content is over 13 percent is selected mostly, and a process for using high-temperature and high-concentration chromic acid and sulfuric acid is adopted, so that defects on the aspects of the performance of a black film and color control and the defects of high energy consumption, high pollution, high cost and the like exist. Stainless steel of which the chromium content is 11.7-13 percent is taken as a substrate material, and a chemical coloring liquid of a low-temperature, low-concentration and nontoxic oxidant is adopted; and a black oxide film which is dense on the appearance and has luster is formed on the surface of low-chromium stainless steel, and a corrosion resisting effect which is the same as that of high-chromium stainless steel is achieved.

Description

technical field [0001] The invention belongs to the fields of chemistry and metallurgy, and relates to a treatment method for chemically blackening low-chromium stainless steel. The formula has the characteristics of cleanliness and environmental protection, and can be used in military industry, light industry and building materials. Background technique [0002] In 1927, the British invented the stainless steel coloring technology and obtained the patent UKP275781, the content of which was to obtain black stainless steel in an aqueous solution of chromic acid and sulfuric acid. Later, people successively obtained patents for various colored stainless steels, but due to various defects, they have not been popularized and applied. In 1972, the British patent GB2066791ABS-1, 122173, and 1972 proposed the Inco method, and chemical coloring of stainless steel began to be used in production. However, there are still deficiencies in the performance of the black film, color contro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/50
CPCC23C22/50
Inventor 张晓波
Owner 张晓波
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