Passivator for treatment of electrolytic manganese metal surface and process for preparing same

A technology of electrolytic manganese metal and surface treatment, which is applied in the direction of metal material coating process, etc., to achieve the effect of simple preparation method, uniform film layer and reduced emission

Inactive Publication Date: 2006-11-22
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, there is no chromium-free passivating agent that can replace chromate for surface passivation of electrolytic manganese.

Method used

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  • Passivator for treatment of electrolytic manganese metal surface and process for preparing same
  • Passivator for treatment of electrolytic manganese metal surface and process for preparing same
  • Passivator for treatment of electrolytic manganese metal surface and process for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. The composition of the passivating agent in Example 1 of the present invention is shown in Table 1.

[0022] components

name

molecular formula

Weight (kg)

Weight content%

main component

Silicate series

Na 2 SiO 3 9H 2 o

7.5

75

Co-solvent

Thiourea

(NH 2 ) 2 CS

0.01

0.1

corrosion inhibitor

Tannic acid

C14H1009

0.04

0.4

Accelerator

Sodium molybdate

Na 2 MoO 4 2H 2 o

0.008

0.1

Benzotriazole

C 6 h 5 N 3

0.002

water

2.44

24.4

[0023] 2. Preparation of passivation solution

[0024] Add silicate and water into the reaction tank according to the above ratio, keep warm at 60°C, and stir vigorously for 5 minutes, then add co-solvent and corrosion inhibitor according to the ratio, after stirring for 30 minutes, cool to room temperature, add accelerator, and react In...

Embodiment 2

[0030] 1. The passivating agent composition of embodiment 2 of the present invention is shown in table 3.

[0031] components

name

molecular formula

Weight (kg)

Weight content%

main component

Silicate series

Na 2 SiO 3 9H 2 o

7.8

78

Co-solvent

aminotrimethylene phosphonic acid

N(CH 2 PO 3 h 2 ) 3

0.02

0.2

(ATMP)

corrosion inhibitor

Phytic acid

C 6 h 18 o 24 P 6

0.04

0.4

Accelerator

sodium chlorate

NaClO 3

0.005

0.06

Benzotriazole

C 6 h 5 N 3

0.001

water

2.134

21.34

[0032] 2. Preparation of passivation solution

[0033] Process is identical with embodiment 1. Prepared with 390L of clear water to obtain a passivation solution with a concentration of 25g / L.

[0034] 3. Use of passivation solution

[0035] The passivation solution ...

Embodiment 3

[0038] 1. The passivating agent composition of embodiment 3 of the present invention is shown in table 5.

[0039] components

name

molecular formula

Weight (kg)

Weight content%

main component

Silicate series

Na 2 SiO 3 9H 2 o

8.0

80

Co-solvent

Thiourea

(NH 2 ) 2 CS

0.02

0.2

corrosion inhibitor

Triethanolamine molybdate

C x h y N z Mo m o n

0.05

0.5

Accelerator

Ammonium molybdate

(NH 4 ) 6 Mo 7 o 24 4H 2 o

0.008

0.1

Benzotriazole

C 6 h 5 N 3

0.002

water

1.92

19.2

[0040] 2. Preparation of passivation solution

[0041] Process is identical with embodiment 1. Prepared with 240L of clear water to obtain a passivation solution with a concentration of 40g / L.

[0042] 3. Use of passivation solution

[0043] a. The passivation process using this product...

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PUM

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Abstract

The invention discloses a passivator and preparing method of electrolytic metal Mn surface, which comprises the following parts: 70-80 percent silicate, 0.1-0.2 percent cosolvent, 0.3-0.5 percent inhibitor, 0.05-0.1 percent accelerant and water. The invention improves the operational environment for workers, which solves the problem of serious pollution of electrolytic Mn factory.

Description

technical field [0001] The invention relates to a passivating agent for electrolytic metal manganese surface passivation treatment and a preparation method thereof. Background technique [0002] In the manganese metal electrolysis production process, the cathode plate must be passivated immediately after leaving the tank, otherwise the silver-white manganese electrolytically separated will be quickly oxidized and discolored by the air, affecting product quality and appearance. The traditional passivation method is to use chromate passivation. Chromate passivation has been popularized due to its simple operation, short treatment time, good effect and cheap medicines. However, the passivation film formed by chromate passivation and the waste liquid of chromate passivation solution contain hexavalent chromium, which has a serious impact on human health and the environment. The liquid can only be discharged after treatment. Usually, the treatment method of chromium ion pollut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/06C23C22/40C23C22/58
Inventor 皮振邦田熙科杨超罗东岳费进波裴芳
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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