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Method for forming high self-heal high corrosion resistance phosphide composite film layer on zinc coat surface

A composite film, self-healing technology, applied in the direction of metal material coating process, can solve the problem of not having self-healing ability, and achieve the effect of self-healing ability, firm bonding and good adhesion

Inactive Publication Date: 2008-04-30
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the phosphating film has certain pores and does not have self-healing ability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Phosphating treatment: After the iron and steel workpiece is galvanized, the workpiece is placed in the phosphating solution for 120s by dipping method and then taken out. The phosphating treatment temperature is 30°C; the phosphating solution configuration is: weigh ZnO pour Pour into 1 / 4 of the working volume of water and stir to form a gel, and add phosphoric acid dropwise while stirring until the ZnO is completely dissolved. NaNO was then added with stirring 3 Add water to the working volume, adjust the pH with NaOH solution, and then heat the solution to the temperature required by the phosphating process. Phosphating solution components include film-forming agent component ZnO, the content of which is 1.2g / L; film-forming agent component H 3 PO 4 , with a content of 15g / L; the film-forming oxidation accelerator component NaNO 3 , the content is 15g / L; NaOH adjusts the pH value of the phosphating solution to 3.0;

[0021] (2) Molybdate sealing: The workpiec...

Embodiment 2

[0023] (1) Phosphating treatment: After the iron and steel workpiece is galvanized, the workpiece is placed in the phosphating solution for phosphating for 600 seconds by dipping method, and then taken out. The phosphating treatment temperature is 50° C.; Phosphating solution components include ZnO with a content of 0.8g / L; H 3 PO 4 , the content is 5g / L; NaNO 3 , the content is 5g / L; NaOH adjusts the pH value of the phosphating solution to 3.0;

[0024] (2) Molybdate sealing: after phosphating in step (1), the workpiece is directly immersed in the molybdate sealing solution for 20 seconds and then taken out. The temperature of the sealing treatment is 60°C, and it is placed in the air to spontaneously ignite and dry. The molybdate blocking solution configuration method is the same as in Example 1. (NH 4 ) 2 MoO 4 2H 2 O content is 20g / L; K 3 PO 4 , with a content of 5g / L; adjust the pH of the molybdate solution to 2 with phosphoric acid.

Embodiment 3

[0026] (1) Phosphating treatment: After the iron and steel workpiece is galvanized, place the workpiece in the phosphating solution for 30 seconds by dipping method, and then take it out. The phosphating treatment temperature is 30°C; Phosphating solution components include ZnO with a content of 1.5g / L; H 3 PO 4 , the content is 20g / L; NaNO 3 , the content is 20g / L; NaOH adjusts the pH value of the phosphating solution to 2.8;

[0027] (2) Molybdate sealing: The workpiece after phosphating in step (1) is directly immersed in the molybdate sealing solution for 60 seconds and then taken out. The temperature of the sealing treatment is 70°C, and it is placed in the air to spontaneously ignite and dry. The molybdate blocking solution configuration method is the same as that in Example 1. Na 2 MoO 4 2H 2 O content is 5g / L, K 2 MoO 4 2H 2 O is 10g / L; Na 3 PO 4 The content is 5g / L, K 3 PO 4 5g / L; adjust the pH of the molybdate solution to 5 with phosphoric acid.

[0028...

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PUM

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Abstract

The invention proposes a method for forming a high corrosion resistant phosphatizing compound film with self-healing performance on the surface of galvanized coating. A galvanized workpiece is phosphatized and hermetically treated with molyadate solution. The phosphate treatment is operated after the iron and steel workpiece is galvanized, an impregnation method is adopted, the workpiece is put in phosphating solution to be phosphatized for 30-600 seconds, and then the workpiece is taken out, the phosphate treatment temperature is 30-50 DEG C; a phosphating solution group comprises a membrane agent component, namely, ZnO, and the content of the ZnO is 0.8-1.5 g / L; the molyadate hermetical treatment includes the steps thatthe phosphatized workpiece is directly immerged in molyadate confinig liquid for 20-60 seconds and then is taken out, the molyadate hermetical treatment temperature is 50-70 DEG C, and the workpiece is put in the air to hypergolically dry. The corrosion resistant performance of the phosphatizing compound film acquired by the invention is superior to the chromate passivating film, and the phosphatizing compound film has the self-healing performance. The invention is adopted to be capable of replacing toxic hexavalent chrome normal passivation which is widely adopted at present, and the phosphatizing compound film is beneficial to the environmental protection, thereby having good promotion and application value and social efficiency.

Description

technical field [0001] The invention relates to a method for forming a self-healing highly corrosion-resistant phosphating composite film on the surface of a galvanized layer. Background technique [0002] Chromate passivation and phosphating are the two main post-treatments of steel after galvanizing. Chromate passivation can improve the corrosion resistance of the product and prevent the product from producing white rust during storage and transportation. Chromate passivation treatment can form a mixed oxide film of chromium / base metal. The chromium in the film mainly exists in the form of trivalent chromium and hexavalent chromium, in which trivalent chromium forms a network as the skeleton, and hexavalent chromium is dispersed in it and Form a film with the gel, trivalent chromium has high stability, so that the passivation film has a certain thickness and good mechanical strength; hexavalent chromium has self-healing properties, so the corrosion resistance of the passi...

Claims

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Application Information

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IPC IPC(8): C23C22/06C23C22/82
Inventor 孔纲卢锦堂林碧兰
Owner SOUTH CHINA UNIV OF TECH
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