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Technical formula of black chemical oxidation of stainless steel

A technology of chemical oxidation and process formula, which is applied in the field of black chemical oxidation of stainless steel, can solve problems such as difficulty in satisfying neutral salt spray test, difficulty in color control, and easy volatilization of the solution, and achieves fast film forming speed, thick film layer, and environmental protection. The effect of less pollution

Inactive Publication Date: 2015-02-18
GUIZHOU HANGRUI AVIATION PRECISION PARTS MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present invention aims to solve the problems in the prior art that the temperature of the bath solution is high, the solution is volatile, the color control is difficult, the color surface is narrow, easy to fade, the oxidation time is long, the film layer is not bright; and it is difficult to meet the 96h neutral salt spray test The problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Stainless steel black chemical oxidation process formula:

[0023] Sodium hydroxide (g / L) 450

[0024] Sodium chloride (g / L) 8

[0025] Sodium thiosulfate (g / L) 45

[0026] Sodium thiocyanate (g / L) 90

[0027] Potassium permanganate (g / L) 2

[0028] Ammonium molybdate (g / L) 5

[0029] Temperature (°C) 90

[0030] Time (min) 3.

Embodiment 2

[0032] Stainless steel black chemical oxidation process formula:

[0033] Sodium hydroxide (g / L) 500

[0034] Sodium chloride (g / L) 12

[0035] Sodium thiosulfate (g / L) 50

[0036] Sodium thiocyanate (g / L) 100

[0037] Potassium permanganate (g / L) 3

[0038] Ammonium molybdate (g / L) 6

[0039] Temperature (°C) 100

[0040] Time (min) 4.

Embodiment 3

[0042] Stainless steel black chemical oxidation process formula:

[0043] Sodium hydroxide (g / L) 550

[0044] Sodium chloride (g / L) 15

[0045] Sodium thiosulfate (g / L) 55

[0046] Sodium thiocyanate (g / L) 110

[0047] Potassium permanganate (g / L) 5

[0048] Ammonium molybdate (g / L) 8

[0049] Temperature (°C) 110

[0050] Time (min) 2.

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Abstract

The invention relates to a technical formula of black chemical oxidation of a stainless steel. The technical formula comprises the following components in terms of g / L: 450-550 of sodium hydroxide, 8-15 of sodium chloride, 45-55 of sodium thiosulfate, 90-110 of sodium thiocyanate, 2-5 of potassium permanganate and 5-8 of ammonium molybdate. The technical formula has the advantages of wide temperature range, high film-forming speed and short oxidation time, wide color, good film layer property and high efficiency, the color is easily controlled and the film does not fade; after potassium permanganate and ammonium molybdate are added, the film layer is thick and has good brightness and the neutral salt spray test in 96 hours can be ensured; and since no pollutants such as chromic anhydride are added, the less environmental pollution is caused.

Description

technical field [0001] The invention relates to a technological formula for black chemical oxidation of stainless steel, mainly aimed at the black chemical oxidation of stainless steel. Background technique [0002] Stainless steel is widely used in aviation, aerospace, shipbuilding, electronics and other industries due to its excellent properties such as corrosion resistance, wear resistance, high mechanical strength, hardness and easy processing. Stainless steel fasteners used in aviation, electronics and other industries need to be black oxidized in order to extinction, increase corrosion resistance and aesthetics; stainless steel oxidation methods include electrolytic oxidation and chemical oxidation, etc., due to stainless steel fastening There are many specifications, small sizes, large quantities, and high requirements. Electrolytic anodizing is not suitable for batch processing of fasteners, and the oxidation process is unstable and difficult to control. Therefore, c...

Claims

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Application Information

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IPC IPC(8): C23C22/62
CPCC23C22/62
Inventor 吴育照王治刚
Owner GUIZHOU HANGRUI AVIATION PRECISION PARTS MFG
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