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An environmentally friendly process to replace chromic acid passivation

An environmentally friendly and high-tech technology, applied in the field of environmentally friendly technology to replace chromic acid passivation, can solve the problems of poor corrosion resistance, long processing time, high processing temperature, etc., and achieve good film forming effect, fast film forming speed, dense and uniform effect

Active Publication Date: 2019-02-19
嘉兴如运建筑科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of environment-friendly process that replaces chromic acid passivation, the passivating agent used in this process overcomes the defects of long processing time, high processing temperature and poor corrosion resistance of existing chromium-free passivating agents, Has good industrial application prospects

Method used

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  • An environmentally friendly process to replace chromic acid passivation
  • An environmentally friendly process to replace chromic acid passivation

Examples

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Effect test

Embodiment 1

[0021] An environmentally friendly process that replaces chromic acid passivation. The passivation solution used for passivation consists of the following components: ammonium persulfate 10g / L, phytic acid 2g / L, trisodium phosphate 15g / L, phosphoric acid 1mL / L, Boric acid 0.5mL / L, zirconium tetrapropoxide 0.5g / L, benzotriazole 0.1g / L, complexing agent 3g / L, water-soluble polyester film-forming resin 5g / L, nano silicon oxide 4g / L, 0.1 g / L of ethylenediaminetetraacetic acid, and the rest is water; the complexing agent is composed of triethanolamine and tetrasodium hydroxyethylidene diphosphonate in a weight ratio of 1:2.

Embodiment 2

[0023] An environmentally friendly process that replaces chromic acid passivation. The passivation solution used for passivation consists of the following components: ammonium persulfate 20g / L, phytic acid 6g / L, trisodium phosphate 25g / L, phosphoric acid 3mL / L, Boric acid 1mL / L, zirconium tetrapropoxide 3g / L, benzotriazole 1g / L, complexing agent 6g / L, water-soluble styrene-acrylic film-forming resin 10g / L, nano-silica 6g / L, stabilizer C The diacid is 3 g / L, and the rest is water; the complexing agent is composed of triethanolamine and tetrasodium hydroxyethylidene diphosphonate in a weight ratio of 1:1.2.

Embodiment 3

[0025] An environmentally friendly process that replaces chromic acid passivation. The passivation solution used for passivation consists of the following components: ammonium persulfate 15g / L, phytic acid 4g / L, trisodium phosphate 20g / L, phosphoric acid 2mL / L, Boric acid 0.8mL / L, zirconium tetrapropoxide 1.5g / L, benzotriazole 0.4g / L, complexing agent 4g / L, water-soluble epoxy film-forming resin 8g / L, nano silicon oxide 5g / L, The stabilizer sodium citrate is 1.3g / L, and the rest is water; the complexing agent is composed of triethanolamine and tetrasodium hydroxyethylidene diphosphonate in a weight ratio of 1:1.

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Abstract

The invention provides a substituted chromic acid passivation environmental protection process. A passivation solution for passivation comprises 10-20 g / L of ammonium persulfate, 2-6 g / L of phytic acid, 15-25 g / L of trisodium phosphate, 1-3 mL / L of phosphoric acid, 0.5-1 mL / L of boric acid, 0.5-3 g / L of zirconium n-propoxide, 0.1-1 g / L of benzotriazole, 3-6 g / L of complexing agent, 5-10 g / L of water-soluble film-forming resin, 4-6 g / L of nanometer silica, 0.1-3 g / L of stabilizing agent, and the balance water. The passivation solution completely meets the electroplating wastewater discharge standards of China, RoHS of the European Union and other environmental protection standards. According to the process, ammonium persulfate and trisodium phosphate serve as main passivation substances, phytic acid serves as an auxiliary passivation substance, and the chelation bridging effect is achieved through crosslinking of water-soluble film-forming resin and the complexing agent, so that a three-substance combined molecular composite film layer is formed. Accordingly, the film forming effect is good, the film forming speed is high, and the film layer has good adhesive force and is compact and uniform in film formation.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to an environmentally friendly process replacing chromic acid passivation. Background technique [0002] Hot-dip metal materials, including hot-dip galvanized metal materials and hot-dip galvanized metal materials, in order to prevent corrosion, a layer of metal protective paint will be coated on the surface of the hot-dip metal materials to form a protective film. Therefore, the performance of metal protective coatings is very important for the anti-corrosion of hot-dip metal materials. [0003] Hexavalent chromate passivation technology is a chemical conversion surface treatment technology commonly used in industry due to its excellent corrosion resistance and good self-healing ability of chemical conversion film. However, due to the high toxicity of hexavalent chromium, it not only produces serious waste water and waste residue pollution in the produc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/08
CPCC23C22/08
Inventor 王薇
Owner 嘉兴如运建筑科技有限公司
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