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Washing passivation solution of surface iron pollution of austenitic stainless steel and preparation method thereof

A technology of austenitic stainless steel and passivation solution, which is applied in the field of material surface treatment, can solve the problems of high cost of cleaning and passivation solution, high price of stabilizer, reduced passivation effect, etc., and achieves good cleaning and passivation effect and safety. Improved, solution-stabilizing effect

Inactive Publication Date: 2012-07-25
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the decomposition of hydrogen peroxide can be inhibited by adding stabilizers, on the one hand, the addition of stabilizers will reduce the passivation effect; on the other hand, traditional hydrogen peroxide stabilizers will complex with the dissolved iron ions when cleaning passivated stainless steel. Combined to produce precipitation, and then lose the stabilizing function; at the same time, the stabilizer is expensive, which makes the cost of cleaning and passivation solution too high

Method used

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  • Washing passivation solution of surface iron pollution of austenitic stainless steel and preparation method thereof
  • Washing passivation solution of surface iron pollution of austenitic stainless steel and preparation method thereof
  • Washing passivation solution of surface iron pollution of austenitic stainless steel and preparation method thereof

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Effect test

Embodiment 1

[0021] The solution components and volume percentages used in the inventive method are: 17% nitric acid, 14% hydrogen peroxide, and the rest is water, and the content of ferrous sulfate is 0.1 mg of ferrous sulfate in 100 ml of the total amount of the aforementioned substances.

[0022] The mass percent concentration of the nitric acid is 65%, the mass percent concentration of the hydrogen peroxide is 30%, and the ferrous sulfate is analytically pure.

[0023] The water of the austenitic stainless steel surface iron pollution cleaning and passivation solution of the present invention is deionized water or distilled water.

[0024] The preparation method of using above-mentioned embodiment 1 cleaning passivation solution is:

[0025] (1) Raw materials are added in proportion, the content of halogen elements in the above-mentioned nitric acid, hydrogen peroxide and water is not more than 45ppm, and the content of sulfur element is below 50ppm;

[0026] (2) ferrous sulfate is di...

Embodiment 2

[0031] The solution components and volume percentages used in the inventive method are: 12% nitric acid, 22% hydrogen peroxide, the rest is water, and the content of ferrous sulfate is 0.5 mg of ferrous sulfate in 100 ml of the total amount of the aforementioned substances.

[0032] The mass percent concentration of nitric acid is 65%, the mass percent concentration of hydrogen peroxide is 30%, and ferrous sulfate is an analytical reagent.

[0033] The water of the austenitic stainless steel surface iron pollution cleaning and passivation solution of the present invention is deionized water or distilled water.

[0034] The preparation method of using above-mentioned embodiment 2 cleaning passivation solution is:

[0035] (1) Raw materials are added in proportion, the content of halogen elements in the above-mentioned nitric acid, hydrogen peroxide and water is not more than 45ppm, and the content of sulfur element is below 50ppm;

[0036] (2) ferrous sulfate is dissolved in w...

Embodiment 3

[0041] The solution components and volume percentages used in the inventive method are: 4% nitric acid, 40% hydrogen peroxide, and the rest is water, and the content of ferrous sulfate is 5 mg of ferrous sulfate in 100 ml of the total amount of the aforementioned substances.

[0042] The mass percent concentration of the nitric acid is 65%, the mass percent concentration of the hydrogen peroxide is 30%, and the ferrous sulfate is analytically pure.

[0043] The water of the austenitic stainless steel surface iron pollution cleaning and passivation solution of the present invention is deionized water or distilled water.

[0044] The preparation method of using above-mentioned embodiment 3 cleaning passivation solution is:

[0045] (1) Raw materials are added in proportion, the content of halogen elements in the above-mentioned nitric acid, hydrogen peroxide and water is not more than 45ppm, and the content of sulfur element is below 50ppm;

[0046] (2) ferrous sulfate is disso...

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Abstract

The invention relates to a washing passivation solution of surface iron pollution of austenitic stainless steel. The washing passivation solution comprises nitric acid, hydrogen peroxide, ferrous sulfate and water; the volume percentages of nitric acid and hydrogen peroxide are 4-17% and 14-40% respectively; and 100 ml of the washing passivation solution contains 0.1-6 mg of ferrous sulfate. Nitric acid can be used in the form of nitric acid solution with the concentration by mass percentage being 60-68%; and hydrogen peroxide can be used in the form of hydrogen peroxide solution with concentration by mass percentage being 27-38%. The preparation method disclosed by the invention comprises the following steps of: (1) adding the raw materials according to the ratio, wherein the content of halogen elements in nitric acid, hydrogen peroxide and water does not exceed 45 ppm and the content of sulfur element is less than 50 ppm; (2) dissolving ferrous sulfate into water to prepare a ferrous sulfate solution; and (3) dissolving hydrogen peroxide and nitric acid into the ferrous sulfate solution according to the ratio; and mixing and stirring uniformly to obtain a finished product. The washing passivation solution disclosed by the invention has the advantage of low operation temperature and can meet the strict requirements of industries of nuclear power, chemical industry and the like on washing and passivating of the austenitic steel.

Description

technical field [0001] The invention belongs to the field of material surface treatment, and relates to a cleaning passivation solution for iron pollution on the surface of austenitic stainless steel and a preparation method. Background technique [0002] Austenitic stainless steel has good corrosion resistance, high temperature oxidation resistance, good low temperature mechanical properties, excellent machining performance and exquisite appearance. In recent years, it has been widely used in atomic energy, aviation, chemical industry, food, marine, etc. industry. Iron pollution on the surface of stainless steel is a very common phenomenon. Iron pollution destroys the integrity of the surface passivation film. Yellow rust spots or rust spots will appear on the surface of stainless steel materials with iron pollution, which not only destroys the appearance of the material, but also It will adversely affect the corrosion resistance and other properties of the material. Duri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/08C23C22/50
Inventor 程从前赵杰段传成雷明凯曹铁山
Owner DALIAN UNIV OF TECH