A green low-temperature rapid method for preparing phosphating film

A phosphating film and low temperature technology, which is applied in the field of material science and surface, can solve the problems of high energy consumption of phosphating treatment, increased phosphating cost, complicated phosphating process, etc., and achieves low cost, uniform and fine film layer, and phosphating formation high power effect

Active Publication Date: 2019-01-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is to provide a green method for quickly preparing phosphating film at low temperature, so as to solve the problems of high energy consumption, long processing time and complicated phosphating process in the existing phosphating treatment, which lead to the increase of phosphating cost. , to achieve low-cost preparation of corrosion-resistant, wear-resistant phosphating film, and the phosphating solution used does not contain harmful metal ions such as sodium nitrite and chromium, and the operating temperature is normal temperature, which meets the requirements of energy saving, environmental protection and consumption reduction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) In parts by weight, the following raw material components are weighed: 4 parts of zinc dihydrogen phosphate, 2 parts of manganese dihydrogen phosphate, 6 parts of zinc nitrate, 2 parts of phosphoric acid, 6 parts of 3.5wt% graphene oxide aqueous solution, 0.2 parts of PVP, 100 parts of water.

[0029] (2) Put the components of step (1) into the reaction kettle, use lye to adjust the pH to 2, then raise the temperature to 40°C, and stir evenly.

[0030] (3) Put the prepared phosphating treatment solution into the phosphating tank, raise the temperature of phosphating treatment to 28°C, then immerse the steel test piece in it, process for 5 minutes, rinse with water and dry to obtain phosphating processed specimens.

[0031] There is basically no phosphating residue in the phosphating pool after phosphating, which shows that the success rate of phosphating of the test piece is high.

[0032] The present invention uses the GB6458-86 neutral salt spray test to test th...

Embodiment 2

[0039] (1) Take the following raw material components according to the weight ratio: 8 parts of zinc dihydrogen phosphate, 4 parts of zinc nitrate, 3 parts of calcium phosphate, 2.5 parts of phosphoric acid, 0.05 parts of graphene oxide powder, 0.2 parts of APEO, and 100 parts of water.

[0040] (2) Put each component into the reaction kettle, use lye to adjust the pH to 3, then raise the temperature to 30°C, and stir evenly.

[0041] (3) Put the prepared phosphating treatment liquid into the phosphating tank, raise the temperature of phosphating treatment to 30°C, then immerse the steel test piece in it, process for 4 minutes, rinse with water and dry to obtain phosphating processed specimens.

[0042]The present invention uses the GB6458-86 neutral salt spray test to test the anti-corrosion performance of the phosphating film.

[0043] The appearance of the phosphating film obtained in Example 2 is gray and bright, the film layer is fine and smooth, and the film thickness i...

Embodiment 3

[0046] (1) Take the following raw material components by weight ratio: 7 parts of zinc dihydrogen phosphate, 6 parts of zinc nitrate, 1 part of phosphoric acid, 0.2 parts of 2.2wt% graphene oxide aqueous solution, 0.2 parts of OP-10 emulsifier, TX- 10 0.3 parts, 120 parts of water

[0047] (2) Put each component into the reaction kettle, use lye to adjust the pH to 3, then raise the temperature to 25°C, and stir evenly.

[0048] (3) Put the prepared phosphating treatment liquid into the phosphating tank, raise the temperature of phosphating treatment to 20°C, then immerse the steel test piece in it, process for 10 minutes, rinse with water and dry to obtain phosphating processed specimens.

[0049] The present invention uses the GB6458-86 neutral salt spray test to test the anti-corrosion performance of the phosphating film.

[0050] The appearance of the phosphating film obtained in Example 3 is gray and bright, the film layer is fine and smooth, and the film thickness is 3...

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PUM

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Abstract

The invention discloses a method for environment-friendly, low-temperature and rapid preparing of a phosphating film. The method comprises the steps that firstly, raw material components including, by mass, 5-8 parts of dihydric phosphate, 6-9 parts of nitrate, 0.5-3 parts of phosphoric acid, 0.05-0.5 part of oxidized graphene, 0.1-1 part of stabilizer, 6-10 parts of pH buffering agents and 100-120 parts of water are thrown into a reaction kettle, the temperature is increased to 20-40 DEG C, and after stirring is conducted for 20-60 min, the mixture is discharged out of the kettle; and secondly, a prepared phosphating solution is placed in a phosphating pond, the phosphating temperature is increased to 15-40 DEG C, then a steel test piece is placed in the phosphating pond, treatment is conducted for 2-20 min, airing is conducted, and the phosphating film is obtained. The obtained phosphating film is grey and bright in appearance, has good corrosion resistance and is good in attaching force with paint. The phosphating method is high in phosphating speed and low in phosphating temperature. A film layer is fine in crystal, the phosphating liquid is stable, little sediment exists, no toxicity or harm is generated to people and the environment, and cost is low.

Description

technical field [0001] The invention discloses a phosphating film, in particular relates to a method for quickly preparing a green phosphating film at low temperature, and belongs to the fields of material science and surface technology. Background technique [0002] Before spraying and painting, the surface of the metal must be converted to form a conversion film. The conversion film includes phosphating film, passivation film, organic film, rare earth conversion film and sol silane film, etc. Among them, the preparation of phosphating film is to put the metal parts into the salt solution containing Zn, Ni, Mn, Fe and other specific acid phosphate as the main body, and at the same time add various composite additives, after chemical treatment, on the metal parts A phosphate conversion film with a certain thickness and insoluble in water is formed on the surface. The purpose of phosphating is mainly to provide protection for the base metal and prevent the metal from being ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/08C23C22/13C23C22/18C23C22/22
CPCC23C22/08C23C22/13C23C22/18C23C22/182C23C22/22
Inventor 张心亚黄浩炜谢于辉
Owner SOUTH CHINA UNIV OF TECH
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