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Non-toxic environment-friendly normal temperature steel nigrescence treating agent and preparation method thereof

A blackening, non-toxic and environmentally friendly technology, applied in the direction of metal material coating process, etc., can solve the problems of harmful operator's health, unfavorable environmental protection, strict requirements on process parameters, etc., and achieve long service life, stable quality and simple operation. Effect

Inactive Publication Date: 2013-03-27
DALIAN SANDAAOKE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing normal temperature blackening treatment agents basically contain highly toxic selenium dioxide or selenous acid, which is not only harmful to the health of the operator, but also not conducive to environmental protection.
At the same time, the normal temperature blackening treatment of iron and steel still has the following outstanding problems in industrial production: the working fluid of blackening treatment is unstable, the service life is short, and the process parameters are strict.
The above defects have hindered the wide application and rapid development of steel blackening treatment technology at room temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] The raw materials and mass percentages used are as follows: copper sulfate pentahydrate 1%, zinc dihydrogen phosphate 4%, zinc nitrate 1%, citric acid 0.3%, EDTA-disodium 1%, sodium thiosulfate 6%, ammonium molybdate 1% 1.5% nickel sulfate hexahydrate, 0.1% hydroquinone, 1.5% potassium dichromate and the balance of water.

[0009] The preparation method is carried out according to the following steps in sequence: first add the calculated and weighed water into the reaction kettle, start the agitator, and control the rotation speed to 60 rpm, and then sequentially add the calculated and weighed copper sulfate pentahydrate, nickel sulfate hexahydrate, Citric acid, zinc dihydrogen phosphate, zinc nitrate, EDTA-disodium, sodium thiosulfate, ammonium molybdate, hydroquinone, potassium dichromate are gradually added to the reaction kettle, each raw material must be stirred until Fully dissolve, and finally stir until the solution is a yellow-green opaque homogeneous liquid. ...

Embodiment 2

[0011] Raw material and production method are all the same as embodiment 1, and its raw material mass percent is as follows: copper sulfate pentahydrate 5%, zinc dihydrogen phosphate 1%, zinc nitrate 6%, citric acid 0.1%, EDTA-disodium 2%, thiosulfuric acid Sodium 1%, ammonium molybdate 4%, nickel sulfate hexahydrate 0.5%, hydroquinone 0.6%, potassium dichromate 0.5% and water balance.

Embodiment 3

[0013] Raw material and production method are all the same as embodiment 1, and its raw material mass percent is as follows: copper sulfate pentahydrate 3%, zinc dihydrogen phosphate 2%, zinc nitrate 4%, citric acid 0.2%, EDTA-disodium 1.5%, thiosulfuric acid Sodium 3%, ammonium molybdate 2%, nickel sulfate hexahydrate 1.0%, hydroquinone 0.3%, potassium dichromate 1.0% and water balance.

[0014] When in use, the embodiment 1, 2 or 3 of the present invention is 1:10 according to the volume ratio to add water to prepare the working liquid, and adopt phosphoric acid to adjust the pH value to 1.0-2.0Pt. After 20-30 minutes of blackening treatment, a normal temperature blackened film layer with excellent bonding strength can be obtained, and the working bath solution is stable.

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PUM

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Abstract

The invention discloses a non-toxic environment-friendly normal temperature steel nigrescence treating agent, which consists of the following components by mass percent: 1-5% of blue copperas, 1-4% of zinc dihydrogen phosphate, 1-6% of zinc nitrate, 0.1-0.3% of citric acid, 1-2% of EDTA(ethylene diamine tetraacetic acid)-disodium, 1-6% of sodium thiosulfate, 1-4% of ammonium molybdate, 0.5-1.5% of nickel sulfate hexahydrate, 0.1-0.6% of hydroquinone, 0.5-1.5% of potassium dichromate and the balance of water. The steps of the preparation method is as follows in sequence: firstly adding water calculated and weighted into a reaction kettle, starting a stirrer, controlling the rotated speed within 60 turns per minute, then sequentially and slowly adding the blue copperas, nickel sulfate hexahydrate, citric acid, zinc dihydrogen phosphate, zinc nitrate, EDTA-disodium, sodium thiosulfate, ammonium molybdate, hydroquinone, and potassium dichromate that are calculated and weighted into the reaction kettle, wherein each raw material added into the reaction kettle needs to be stirred for complete dissolution so as to obtain yellowgreen white out uniform liquid finally.

Description

technical field [0001] The invention relates to a normal-temperature blackening treatment agent and a preparation method, in particular to a non-toxic and environment-friendly normal-temperature blackening treatment agent for iron and steel with stable quality and a preparation method. Background technique [0002] At present, the normal temperature blackening treatment process of iron and steel workpieces has been applied in industrial production. But the existing normal temperature blackening treatment agent basically all contains highly toxic selenium dioxide or selenous acid, which is not only harmful to the health of the operator, but also unfavorable for environmental protection. At the same time, the normal temperature blackening treatment of iron and steel still has the following outstanding problems in industrial production: the working fluid of blackening treatment is unstable, the service life is short, and the process parameters are strict. The above defects hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/43
Inventor 潘德顺黄文飞
Owner DALIAN SANDAAOKE CHEM
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