Surface pretreatment agent before metal coating and preparation method and use method thereof

A pretreatment agent, front surface technology, applied in the direction of metal material coating process, etc., can solve the problems of poor corrosion resistance, difficult film formation of fluorine compounds, difficult to replace phosphating agents, etc., to achieve simple and convenient operation and improve compactness. , the effect of improving production efficiency

Inactive Publication Date: 2010-03-03
安徽天航机电有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Chinese Patent Application No. 200810020748.2 proposes a method including silane coupling agent (SA), water-dispersible silica, fluorine compound, acetic acid and water, through the screening and compounding of main components such as surface regulator and auxiliary film-forming agent, to form A layer of silane adsorption film, the fluorine compound is used to increase the density of the silane adsorption film, but experiments have proved that it is difficult for the fluorine compound to form a film at the film formation temperature given in the application; therefore, this film forming agent is used instead of the phosphating agent treatment The film layer formed after the metal surface is single, the corrosion resistance is poor, and it is difficult to replace the phosphating agent

Method used

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  • Surface pretreatment agent before metal coating and preparation method and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A surface pretreatment agent before metal painting:

[0044] Nanoscale SiO 2 1.5kg;

[0045] Water-soluble silane coupling agent: 1.6kg;

[0046] h 2 TiF 6 : 1.8kg;

[0047] Water: 8.5kg.

[0048] Nanoscale SiO 2 Fully wet with water, add water-soluble silane coupling agent, stir and disperse to obtain colloid, add H 2 TiF 6 , then add the rest of the water and mix well; slowly add 0.1M H 2 SO 4 Stir evenly, adjust the pH value of the treatment agent to 2.0 to prepare the surface treatment agent before metal coating.

[0049] First add clear water to the coating tank, then add the surface treatment agent before metal coating prepared above, stir for 30-45 minutes, measure the concentration and adjust the pH value to 4.5.

[0050] Take the spare GB / T1727 standard 5×10cm that has been degreased 2 5 pieces of cold-rolled steel plates were immersed in the coating tank for 30 seconds, taken out and cleaned 3 times, washed 3 times with circulating ...

Embodiment 2

[0052] A surface pretreatment agent before metal painting:

[0053] Nanoscale TiO 2 1.9kg;

[0054] Water-soluble silane coupling agent 1.8kg;

[0055] h 2 SiF 6 1.5kg;

[0056] h 2 ZrF 6 0.8kg;

[0057] 9kg of water.

[0058] The preparation method is the same as in Example 1; add 0.9kg of antiscalant polyacrylic acid to the prepared product, stir well, and slowly add 0.1M H 2 SO 4 Stir evenly, adjust the pH value of the treatment agent to 3 to prepare the surface treatment agent before metal coating.

[0059] First add clear water to the coating tank, then add the product prepared above and stir for 30-45 minutes, measure the concentration and adjust the pH value to 5.

[0060] Take the spare GB / T1727 standard 5×10cm that has been degreased 2 5 pieces of cold-rolled steel plates, evenly spray the treatment agent with a pH value of 5 on the cold-rolled steel plates, let it stand for 60 seconds, wa...

Embodiment 3

[0062] A surface pretreatment agent before metal painting:

[0063] Nanoscale SiO 2 1.1kg;

[0064] Nanoscale ZrO 2 0.9kg;

[0065] Aluminum zirconium crosslinking agent (coupling agent) 1.9kg;

[0066] h 2 Hf 6 2.1kg;

[0067] 8.8kg of water.

[0068] The preparation method is the same as in Example 1; add 0.5kg of scale inhibitor maleic acid-acrylic acid copolymer to the prepared product, stir evenly, and slowly add 0.1M H 2 SO 4 Stir evenly, adjust the pH value of the treatment agent to 2.5 to prepare the surface treatment agent before metal coating.

[0069] First add clear water to the coating tank, then add the product prepared above, stir for 30-45 minutes, measure the concentration and adjust the pH value to 6.

[0070] Take the spare 5×10cm that has been degreased 2 5 pieces of galvanized sheets were immersed in the treatment agent coating tank with a pH value of 6 for 90 seconds, taken out and...

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Abstract

The invention discloses a surface pretreatment agent before metal coating, consisting of components with the following weight ratio: 15-19 portions of film-forming agents; 15-19 portions of coupling agents; 18-23 portions of water-soluble F-containing complex compounds; and 85-90 portions of water. A method for preparing the surface pretreatment agent before metal coating is as follows: firstly wetting the film-forming agents sufficiently with water; and then adding the coupling agents, the F-containing complex compounds or the salts thereof, and the balance of water to be evenly mixed; the method for using the surface pretreatment agent before metal coating comprises the following steps of: firstly using water to dilute the surface pretreatment agent before metal coating until the pH value thereof is 4.5-6; spraying or infiltrating the surface of the treated metal with the treatment time of 30s-90s; and by adopting the technical scheme, the film can be tightly combined with the coating on the metal surface, forms a middle layer with very strong combination force between the metal and the coating, has very good combination force both with the metal surface and the coating, and cancompletely replace the phosphating agent.

Description

technical field [0001] The invention relates to a surface pretreatment agent before metal coating, a preparation method and a use method before metal coating. Background technique [0002] According to the relevant provisions of the national standard GB / T6807-2001 "Phosphating Treatment Technology for Iron and Steel Workpieces Before Painting" and "Aviation Industry Standard" HB / 25080-1996, the standard method of surface treatment before metal painting today is to use phosphate The method based on phosphating is usually called phosphating treatment. Phosphating treatment is to form a protective film of phosphate crystals on the surface of the metal to be coated. After the metal surface is coated, good adhesion and impact resistance of the coating can be obtained. And other mechanical properties, and improve the corrosion resistance of the coating. Iron substrates and zinc substrates generally adopt phosphating technology. The basic principle is that the substrates are soake...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/34
Inventor 孙昌圣钟新成王路军徐业留
Owner 安徽天航机电有限公司
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