Environment friendly room temperature non-slag colorful chemical conversion solution and process

A chemical conversion, environmentally friendly technology, applied in the field of color film, to achieve the effect of good corrosion resistance, fine crystallization and stable bath liquid

Inactive Publication Date: 2009-06-17
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the passive film treated with this type of conversion solution has excellent corrosion resistance, it tends to be replaced by a low-toxicity treatment solution because the treatment solution contains a large amount of highly toxic hexavalent chromium.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0047] Take 40×40×1mm cold-rolled steel sheet for use.

[0048] (6) Chemical transformation

[0049] Put the activated test piece into the chemical conversion solution, control the temperature at 20°C, and adjust the pH to 2.8 with sodium hydroxide for 15 minutes. The chemical conversion formula is as follows: zinc phosphate 10.8g / L, phosphoric acid (concentration not less than 85%) 9.5ml / L, acid manganese phosphate 1.7g / L, sodium phosphate 3.9g / L, adipic acid 6.5g / L, Zinc nitrate 3.1g / L.

[0050] (7) dry

[0051] Take the test piece treated with the chemical conversion solution out of the bath, rinse it with tap water, and dry it with a hair dryer.

[0052] The surface of the obtained test piece is covered with a uniform crystal fine color chemical conversion film, and the corrosion resistance time of the copper sulfate drop test is 110s.

example 2

[0053] Example 2: Except that the proportioning composition of (6) chemical conversion treatment is different, all treatment steps (1), (2), (3), (4), (5), (6), (7) and Example 1 is the same.

[0054] Chemical conversion: Put the activated test piece into the chemical conversion liquid, control the temperature at 10°C, adjust the pH to 2.7 with sodium hydroxide and treat for 30 minutes; chemical conversion liquid formula: zinc phosphate 10.3g / L, phosphoric acid 15.0ml / L, acid manganese phosphate 2.8g / L, sodium phosphate 6.0g / L, oxalic acid 8.4g / L, sodium nitrate 4.6g / L.

[0055] The obtained chemical conversion film is a crystalline fine color film layer, and the resistance to the copper sulfate drop test is up to 90s.

example 3

[0057]Except that the proportioning composition of (6) chemical conversion treatment is different, all treatment steps (1), (2), (3), (4), (5), (6), (7) are identical with example 1 .

[0058] Chemical conversion: put the activated test piece into the chemical conversion solution, control the temperature at 30°C, adjust the pH to 2.5 with sodium hydroxide, and treat for 10 minutes; chemical conversion liquid formula: zinc phosphate 3.8g / L, phosphoric acid 4.0 ml / L, acid manganese phosphate 0.6g / L, sodium phosphate 1.8g / L, acetic acid 4.1g / L, copper nitrate 1.6g / L.

[0059] The obtained chemical conversion film is a crystalline and fine colored film layer, which is resistant to the copper sulfate drop test for 100s.

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Abstract

The invention relates to an environment-friendly room temperature no-slag colorful chemical conversion solution and a process thereof; the process is characterized in that the carbon steel is arranged and treated in bath solution with the temperature of 10-31 DEG C which contains 3.8-10.3g/L of zinc phosphate, 4.0-15.0mL/L of phosphoric acid, 0.6-2.8g/L of manganese salt, 1.8-6.0g/L of sodium phosphate, 4.1-8.4g/L of organic acid salt and 0.6-4.6g/L of accelerator and has the pH value of 2.5-3.2 for 8-30 minutes, washed by tap water and dried, thus forming a uniform and compact colorful chemical conversion film on the surface of the carbon steel; the conversion film has excellent decoration performance, anti-corrosion performance and subsequent manufacturability. The conversion solution and the process excellently solve the problem of heavy pollution and large energy dissipation during phosphating at high and intermediate temperature and bluing at high temperature, and also solve the problems of environment pollution, harm on the health of operators, bad anti-corrosion performance of the blued film, bad adhesion of the substrate and the blued film, and the like due to selenious acid and copper ions in blued solution at normal temperature and hexavalent chromium ions in oxidation passivation solution.

Description

technical field [0001] The invention relates to a formula and a process for carrying out chemical conversion treatment of phosphating, passivation and bluing (blackening) at normal temperature on the surface of carbon steel, through the chemical conversion treatment of phosphating, passivation and bluing (blackening), Form a uniform and fine-grained color film on the surface of carbon steel to enhance the corrosion resistance and decorative properties of the steel surface, as well as the subsequent surface treatment performance. It is a new type of energy-saving and environment-friendly steel surface corrosion resistance and decorative surface treatment process and technology, which belongs to the field of fine chemicals. Background technique [0002] Chemical conversion treatment refers to immersing metal parts in a chemical bath and undergoing certain chemical treatment to improve the corrosion resistance and subsequent treatment performance of the substrate surface. Chem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/07
Inventor 熊金平黄亚军左禹
Owner BEIJING UNIV OF CHEM TECH
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