Chromate-free passivation solution applied to electrogalvanizing, and passivation technology for same

A chromium-free passivation and electro-galvanizing technology, applied in the direction of metal material coating technology, can solve the problems of poor corrosion resistance, poor weather resistance and stability of passivation film, etc., to improve stability and weather resistance, improve resistance Corrosive and anti-oxidative properties, the effect of slowing down the deposition rate

Active Publication Date: 2020-05-15
GUANGZHOU SANFU NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the passivation solution does not use chromate, which is harmful to the human body and the environment, the passivation film obtained by using the passivation solution has poor weather resistance and stability, and poor corrosion resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Among them, the reagents used in the present invention are commonly used reagents, which can be purchased from conventional reagent production and sales companies. Embodiment 1 A kind of chromium-free passivation solution and passivation process thereof for electro-galvanizing

[0030] The chromium-free passivation solution for electroplating zinc consists of the following components and parts by weight: 10 parts of ammonium molybdate, 5 parts of sodium phosphate, 1 part of cerium nitrate, 15 parts of nitric acid with a mass concentration of 60%, tartaric acid 3 parts of sodium, 1.5 parts of complexing agent, 2 parts of film-forming auxiliary agent, 40 parts of deionized water.

[0031] The complexing agent is composed of sodium alginate, polyacrylic acid and triethanolamine in a weight ratio of 1:10:15.

[0032] The film-forming auxiliary agent is composed of phytic acid, calcium silicate and linoleic acid in a weight ratio of 10:9:5.

[0033] The pH value of the pas...

Embodiment 2

[0038] Embodiment 2 A kind of chromium-free passivation solution and passivation process thereof for electro-galvanizing

[0039] The chromium-free passivation solution for electroplating zinc consists of the following components and parts by weight: 23 parts of ammonium molybdate, 12 parts of sodium phosphate, 3 parts of cerium nitrate, 25 parts of nitric acid with a mass concentration of 70%, tartaric acid 9 parts of sodium, 2.5 parts of complexing agent, 5 parts of film-forming auxiliary agent, and 55 parts of deionized water.

[0040] The complexing agent is composed of sodium alginate, polyacrylic acid and triethanolamine in a weight ratio of 2:8:13.

[0041] The film-forming auxiliary agent is composed of phytic acid, calcium silicate and linoleic acid in a weight ratio of 13:7:4.

[0042]The pH value of the passivation solution is 4.5, and the pH is adjusted with ammonia water.

[0043] The preparation method of the chromium-free passivation solution for electro-galva...

Embodiment 3

[0047] Embodiment 3 A kind of chromium-free passivation solution and its passivation process for electro-galvanizing

[0048] The chromium-free passivation solution for electroplating zinc consists of the following components and parts by weight: 28 parts of ammonium molybdate, 15 parts of sodium phosphate, 5 parts of cerium nitrate, 30 parts of nitric acid with a mass concentration of 75%, tartaric acid 15 parts of sodium, 3.5 parts of complexing agent, 9 parts of film-forming auxiliary agent, 70 parts of deionized water.

[0049] The complexing agent is composed of sodium alginate, polyacrylic acid and triethanolamine in a weight ratio of 4:6:8.

[0050] The film-forming auxiliary agent is composed of phytic acid, calcium silicate and linoleic acid in a weight ratio of 15:6:2.

[0051] The pH value of the passivation solution is 5.0, and the pH is adjusted with phosphoric acid.

[0052] The preparation method of the chromium-free passivation solution for electro-galvanizin...

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PUM

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Abstract

The invention belongs to the technical field of electrogalvanizing technologies and specifically relates to a chromate-free passivation solution applied to electrogalvanizing, and a passivation technology for the same. The chromate-free passivation solution applied to electrogalvanizing provided by the invention comprises, by weight, the constituents including 10-28 parts of ammonium molybdate, 5-15 parts of sodium phosphate, 1-5 parts of cerous nitrate, 15-30 parts of nitric acid with a mass concentration of 60%-75%, 3-15 parts of tartaric acid, 1.5-3.5 parts of a complexing agent, 2-9 partsof a film formation assistance agent and 40-70 parts of deionized water. Through use of the chromate-free passivation solution applied to electrogalvanizing provided by the invention, stability and weather resistance of a passivation film are enhanced, a zinc alloy material can be protected effectively, external corrosion is avoided, the service life is effectively prolonged; and the chromate-freepassivation solution is a good passivation solution which can take the place of a chromate passivation solution.

Description

technical field [0001] The invention belongs to the technical field of electroplating technology, and in particular relates to a chromium-free passivation solution for electroplating zinc and a passivation technology thereof. Background technique [0002] As an effective anti-corrosion method, galvanizing is widely used in steel parts, and it is a widely used anti-corrosion method for ferrous metals at home and abroad. Because the zinc coating is prone to corrosion in a humid environment, resulting in white spots and gray matter, and red rust will appear after a long time, thus losing the anti-corrosion effect. Therefore, in order to improve the corrosion resistance of the zinc coating, passivation treatment must be carried out. [0003] The chromate passivation process commonly used at present is easy to operate, has good self-repair ability and good corrosion resistance of the passivation film, but hexavalent chromium is a carcinogen, which is seriously harmful to the huma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/42C25D5/48
CPCC23C22/42C25D5/48
Inventor 田志斌孟祥举邓正平胡明
Owner GUANGZHOU SANFU NEW MATERIALS TECH
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