Trivalent chromic rainbow color passivating agent for galvanizing and its production

A manufacturing method and passivating agent technology, applied in the coating process of metal materials, etc., to achieve the effects of good color consistency, reduced operation risk, and wide operating range

Active Publication Date: 2005-02-23
江西伟邦化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is particularly noteworthy that in recent years, a large number of studies have confirmed its carcinogenicity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. The composition of embodiment one passivating agent of the present invention

[0025] See Table 1.

[0026] serial number

name

Specification%

Weight (g)

Mole number mol / L

Remark

1

Chromium nitrate

99.5

261.3

0.65

Cr 3+ with chelating agent

The molar ratio is

1:1.16

2

nitric acid

48

107.8

0.8213

3

potassium sodium tartrate

99.5

111.5

0.3933

4

gluconic acid

50

68.3

0.1742

5

citric acid

99

39.4

0.1857

6

sodium nitrate

98

196

2.259

7

cobalt nitrate

99

30.3

0.1031

8

pure water

-

445

-

[0027] 2. The preparation method of passivating agent concentrate

[0028] a. Add nitric acid and pure water in Table 1 into a reactor wi...

Embodiment 2

[0039] 1. the composition of embodiment two passivating agent of the present invention

[0040] See Table 2.

[0041] serial number

name

Specification%

Weight (g)

Mole number mol / L

Remark

1

Chromium nitrate

99.5

261.3

0.65

Cr 3+ with chelating agent

The molar ratio is

1:1.257

2

gluconic acid

50

85

0.2168

3

tartaric acid

99

65.7

0.4333

4

citric acid

99

35.4

0.1667

5

sodium nitrate

98

269

3.1

6

cobalt nitrate

99

30

0.103

7

water

-

494

-

[0042] In the chelating agent, gluconic acid is 26.51%, tartaric acid is 53.05%, and citric acid is 20.4%. (The above is the mole percentage)

[0043] 2. The preparation method of passivating agent concentr...

Embodiment 3

[0048] 1. The composition of embodiment three passivating agent of the present invention

[0049] See Table 3.

[0050] serial number

name

Specification%

Weight (g)

Mole number mol / L

Remark

1

Chromium trichloride

99

175

0.65

Cr 3+ with chelating agent

The molar ratio is

1:1.33

2

gluconic acid

50

90

0.23

3

tartaric acid

99

69.7

0.46

4

citric acid

99

37.4

0.176

5

potassium nitrate

98

47

0.455

6

sodium nitrate

98

230

2.65

7

cobalt nitrate

99

40

0.136

8

pure water

-

560

-

[0051] In the chelating agent, gluconic acid is 26.56%, tartaric acid is 53.12%, and citric acid is 20.32%. (The above is the mol...

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PUM

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Abstract

A trivalent chromic ion iridescent passivating agent for galvanizing and its preparing method are disclosed. It consists of trivalent chromic salt, chelating agent, oxidant, the mol ration is 1:1:2.5-1:2:5.5, the trivalent chromic ion concentration in passivating groove liquid is 2.5-25g/L. It is prepared by adding the components into reactor, heating, mixing and chelating reacting, boiling and back-flowing to remove nitrogen dioxide after reacting, adding water and adjusting to obtain passivating agent concentrate with Cr3+ ionic concentration 30-80g/l after discharging. It achieves no pollution and wide range.

Description

technical field [0001] The invention relates to a passivating agent for treating galvanized surfaces and a manufacturing method thereof, in particular to a trivalent chromium iridescent passivating agent and a manufacturing method thereof. Background technique [0002] In order to improve the aesthetics and corrosion resistance of the galvanized surface, people have been using Cr 6+ It is treated with chromate passivation. This kind of treatment is divided into white zinc, blue white zinc, rainbow zinc, army green zinc, black zinc, etc. due to its different formulas. Among them, rainbow zinc has the most comprehensive comprehensive performance, so it accounts for the largest proportion. [0003] As we all know, hexavalent chromium is a substance that seriously pollutes the environment. Long-term exposure will lead to chromium ulcers, erosive rhinitis, and perforation of the nasal septum. It is particularly noteworthy that in recent years, a large number of studies have con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/53
CPCC23C2222/10
Inventor 施镇涛
Owner 江西伟邦化工有限公司
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