A kind of chromium-free passivation solution and passivation process for electro-galvanizing

A chromium-free passivation and electro-galvanizing technology, which is applied in the coating process of metal materials, can solve the problems of poor corrosion resistance, poor weather resistance and stability of passivation film, etc., to improve corrosion resistance, realize clean production, The effect of extending the service life

Active Publication Date: 2022-04-01
GUANGZHOU SANFU NEW MATERIALS TECH
View PDF8 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1 A kind of chromium-free passivation solution and passivation process thereof for electrogalvanizing

[0030] The chromium-free passivation solution for electrogalvanizing is composed 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 adjuvant, and 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 is composed of phytic acid, calcium silicate and linoleic acid in a weight ratio of 10:9:5.

[0033] The pH value of the passivation solution is 4.0, and the pH is adjusted with phosphoric acid.

[0034] The method for preparing a chromium-free passivation solution for electro-galvanizing includ...

Embodiment 2

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

[0039] The chromium-free passivation solution for electrogalvanizing is composed 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 adjuvant, 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 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 method for preparing a chromium-free passivation solution for electrogalvanizing includes...

Embodiment 3

[0047] Embodiment 3 A kind of chromium-free passivation solution and passivation process thereof for electrogalvanizing

[0048] The chromium-free passivation solution for electro-galvanizing is composed 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 adjuvant, and 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 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 method for preparing a chromium-free passivation solution for electrogalvanizing inclu...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

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. A chromium-free passivation solution for electro-galvanizing provided by the invention comprises the following components and parts by weight: 10 to 28 parts of ammonium molybdate, 5 to 15 parts of sodium phosphate, and 1 to 5 parts of cerium nitrate, with a mass concentration of 15-30 parts of 60-75% nitric acid, 3-15 parts of sodium tartrate, 1.5-3.5 parts of complexing agent, 2-9 parts of film-forming auxiliary agent, 40-70 parts of deionized water. The chromium-free passivation solution for galvanizing provided by the invention not only improves the stability and weather resistance of the passivation film, but also can effectively protect the zinc alloy material from external corrosion and effectively prolong its service life. An excellent passivation solution that can replace chromate passivation solution.

Description

technical field [0001] The invention belongs to the technical field of electroplating technology, and particularly relates to a chromium-free passivation solution for electrogalvanizing and a passivation process thereof. Background technique [0002] As an effective anti-corrosion method, galvanizing is widely used in steel parts and is a widely used anti-corrosion method for ferrous metals at home and abroad. Since the zinc coating is prone to corrosion in a humid environment, white spots and dark objects will appear, 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 commonly used chromate passivation process is easy to operate, the passivation film has good self-healing ability and good corrosion resistance, but hexavalent chromium is a carcinogen, which is seriously harmful to the human body and the environme...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap