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Technique for coloring copper red on tool steel component by chemical method

A chemical method and technology of steel parts, applied in the direction of metal material coating process, etc., can solve the problems of strong corrosion, serious environmental pollution of waste liquid, slow development, etc., and achieve mild process operating conditions, simple and easy process, and waste liquid The effect of small emissions

Inactive Publication Date: 2007-11-28
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for applying a colored layer onto tools made from materials like stainless steels by creating an oxide coat that acts similar to chrome plated surfaces without causing damage during use. It also provides technical benefits such as lower costs compared with traditional methods while maintaining good quality control over its final product's properties.

Problems solved by technology

Technological Problem addressed in this patents relates to developing a chemically stable and effective way to improve the quality (color), durability or recognition properties of tools made from metals like iron, nickel, chrome, tungsten, etc., without causing environmental concerns during production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The first step, preprocessing

[0026] Use a metal cleaning agent to remove oil stains on the surface of tool steel parts, rinse with tap water, and then rinse with distilled water, then put it into 10% sulfuric acid solution for activation. The activation time is 0.5 minutes, and the activation temperature is normal temperature.

[0027] Step two, coloring

[0028] Prepare an aqueous solution with copper sulfate 2g / L, disodium edetate 0.5g / L, potassium sodium tartrate 0.1g / L, ammonium molybdate 0.2g / L and sodium sulfite 1g / L, which is the coloring solution. Submerge the nozzle into the coloring solution, the temperature is room temperature, and the coloring time is 5.5 minutes.

[0029] The third step, post-processing

[0030] Take out the batch nozzle after the second step of coloring, seal the film with 80-100°C distilled water for 5-10 minutes, then put it in a drying oven at 80-100°C and dry it, then use alkyd resin paint or other colorless Seal the film with tr...

Embodiment 2～3

[0050] Except that the coloring solution composition and process conditions in the second step coloring process are listed in Table 1, other steps are all the same as in Example 1.

[0051]

serial number

Coloring liquid formula

g / L

coloring time

/ minute

coloring temperature

Example 2

Copper sulfate 6

3.5

room temperature

Disodium edetate 0.7

Sodium Potassium Tartrate 0.25

Ammonium molybdate 0.45

Sodium sulfite 1.5

Example 3

Copper sulfate 8

1

room temperature

Disodium EDTA 1.1

Sodium Potassium Tartrate 0.5

Ammonium molybdate 0.9

Sodium sulfite 2.0

[0052] The product performance testing results are shown in Table 2.

[0053] Test items

Embodiment 4～5

[0055] Except that the activation time in the first step pretreatment is respectively 1 minute and 1.5 minutes, other steps are all the same as in Example 1. Product performance result is the same as embodiment 1.

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PUM

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Abstract

The invention relates to color the copper red. The process is: first to pre-treat; second to color the copper. The color liquid is made up of: CuSO4 2-8g/L, EDTA-2Na 0.5-1.1g/L, seignette salt 0.1-0.5g/L, ammonium molybdate 0.2-0.9g/L and sodium sulfite 1-2g/L; the pre-treated steel piece is dipped into the color liquid and the temperature is room temperature, the time is 1-5.5min; thirdly to back treat and get the product. The invention has the mild condition and the color liquid has no corrosion to steel and cost little. The treating area of the color liquid can reach 1.1m2/L and has little waste liquid discharge.

Description

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Claims

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Application Information

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Owner HEBEI UNIV OF TECH
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