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A kind of preparation method of trivalent chromium black passivation solution

A technology of passivation solution and trivalent chromium, applied in the field of passivation solution, can solve problems such as water ecological environment pollution, and achieve the effects of good corrosion resistance, dense film layer and uniform color

Active Publication Date: 2018-09-21
丰顺县达森科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under certain conditions, Co(II) can be oxidized to unstable Co(III) in air, which can take electrons from Cr(III) to become stable Co(II), and make Cr(III) into Cr(Ⅵ); in addition, the excessive use of cobalt (nickel) salt will cause permanent pollution to the aquatic ecological environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A preparation method for trivalent chromium black passivation solution, comprising the following steps:

[0018] Step 1, in parts by weight, add 2 parts of chromium trioxide and 1 part of sodium dichromate to 10 parts of water, add 3 parts of reducing agent, stir, then add 3 parts of silica sol, adjust the pH to 1.0-2.0, Get the base fluid;

[0019] Step 2, in parts by weight, add 2 parts of glycolic acid, 1 part of malic acid, 3 parts of sodium sulfide, 2 parts of ferrous ammonium sulfate, 1 part of sodium molybdate, 2 parts of titanyl sulfate, and 1 part of tannic acid to 8 parts of water, mixed to obtain mixture A;

[0020] Step 3, in parts by weight, put the base liquid into a ball mill tank, add mixture A and 2 parts of hydroxyethylene diphosphonic acid, and perform ball milling with alumina ceramic balls as the ball milling medium to obtain mixture B;

[0021] Step 4, in parts by weight, add 1 part of sodium hexametaphosphate, 2 parts of sodium dihydrogen phosph...

Embodiment 2

[0025] A preparation method for trivalent chromium black passivation solution, comprising the following steps:

[0026] Step 1, in parts by weight, take 5 parts of chromium trioxide and 3 parts of sodium dichromate and add them to 11 parts of water, add 6 parts of reducing agent, stir, then add 7 parts of silica sol, adjust the pH to 1.0-2.0, Get the base fluid;

[0027] Step 2, in parts by weight, add 4 parts of glycolic acid, 2 parts of malic acid, 4 parts of sodium sulfide, 6 parts of ferrous ammonium sulfate, 3 parts of sodium molybdate, 4 parts of titanyl sulfate, 4 parts of tannic acid to In 12 parts of water, mix to obtain mixture A;

[0028] Step 3, in parts by weight, put the base liquid into a ball mill tank, add mixture A and 4 parts of hydroxyethylene diphosphonic acid, and perform ball milling with alumina ceramic balls as the ball milling medium to obtain mixture B;

[0029] Step 4, in parts by weight, add 3 parts of sodium hexametaphosphate, 4 parts of sodium ...

Embodiment 3

[0033] A preparation method for trivalent chromium black passivation solution, comprising the following steps:

[0034] Step 1, in parts by weight, add 6 parts of chromium trioxide and 2 parts of sodium dichromate to 14 parts of water, add 8 parts of reducing agent, stir, then add 7 parts of silica sol, adjust the pH to 1.0-2.0, Get the base fluid;

[0035] Step 2, in parts by weight, add 6 parts of glycolic acid, 3 parts of malic acid, 4 parts of sodium sulfide, 5 parts of ferrous ammonium sulfate, 3 parts of sodium molybdate, 4 parts of titanyl sulfate, 6 parts of tannic acid to In 12 parts of water, mix to obtain mixture A;

[0036] Step 3, in parts by weight, put the base liquid into a ball mill tank, add mixture A and 4 parts of hydroxyethylene diphosphonic acid, and perform ball milling with alumina ceramic balls as the ball milling medium to obtain mixture B;

[0037] Step 4, in parts by weight, add 4 parts of sodium hexametaphosphate, 3 parts of sodium dihydrogen pho...

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PUM

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Abstract

The invention provides a method for preparing a trivalent chromium black passivation solution. The method comprises the steps that chromium trioxide and sodium dichromate are firstly taken to be added into water, a reducing agent is added, stirring is carried out, silica sol is added, pH is adjusted to range from 1.0 to 2.0, and basic liquid is obtained; then glycolic acid, malic acid, sodium sulphide, ammonium ferrous sulfate, sodium molybdate, titanyl sulfate and gallotannic acid are added into water, mixing is carried out, and a mixture A is obtained; then the basic liquid is contained in a ball milling tank, the mixture A and hydroxyethylidene-1,1-diphosphonic acid are added, aluminum oxide ceramic balls are adopted as a ball milling medium for ball milling, and a mixture B is obtained; and finally sodium hexametaphosphate, sodium dihydrogen phosphate, sodium nitrate, stearic acid and methyl oleate are added into the mixture B, a shear emulsifying machine is used for stirring, and the trivalent chromium black passivation solution is obtained. A passivation film formed through the passivation solution is jet-black and bright in appearance and uniform in color, the surface is uniform and level, the film layer is dense, and good corrosion resisting capacity and wide application prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of passivation solution, and in particular relates to a preparation method of trivalent chromium black passivation solution. Background technique [0002] Passivation treatment after galvanizing the surface of steel materials is one of the most commonly used technical methods for steel surface anticorrosion in industry. However, the passivation treatment on the galvanized layer has been using traditional chromate passivation. Because hexavalent chromium is toxic and carcinogenic, it will cause serious harm to the environment and human body, so its application has long been strictly controlled abroad. Restrictions; Since the toxicity of trivalent chromium is only 1% of that of hexavalent chromium, and trivalent chromium passivation has similar properties to hexavalent chromium passivation in many respects, it is the most likely replacement for chromate passivation . [0003] As one of the trivalent chromium...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/42
CPCC23C22/42
Inventor 尤为
Owner 丰顺县达森科技有限公司