Preparation method of metal surface chemical conversion film for polyurea anticorrosive coating

A technology of chemical conversion coating and anti-corrosion coating, applied in the direction of metal material coating process, etc., can solve the problems of water loss and pulverization of phosphating coating, fast film forming speed, complicated process, etc. simple effect

Inactive Publication Date: 2012-12-05
SHANDONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages of traditional phosphating treatment methods: 1) There are many phosphating processes and complex processes; 2) Both degreasing and phosphating steps require heating and high energy consumption; 3) The phosphating solution contains heavy metals such as nitrite and hexavalent chromium 4) The pores of the phosphating film are small, and the high-viscosity liquid coating and solid powder coating are difficult to penetrate into the micropores of the phosphating film. The effect of phosphating treatment is not ideal, especially in the preparation of thick coatings. 5) During the film forming process, heating may cause the phosphating film to lose water and pulverize, and phosphating treatment will reduce the adhesion of the coating, especially when the temperature is higher than 250°C
If the traditional phosphating treatment is adopted, due to the high viscosity and fast film-forming speed of the polyurea coating, it cannot penetrate into the micropores of the phosphating film, and it is difficult to ensure the bonding strength between the coating and the metal substrate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] With steel as the base material, the inositol phosphate chemical conversion coating is obtained through structural preprocessing, degreasing, water washing, sandblasting and surface treatment, and is implemented by the following methods: degreasing and water washing of steel workpieces; sandblasting roughening treatment, controlling the substrate The surface roughness is 80 μm; the composition of the metal surface treatment solution is (g / L): inositol hexaphosphate 10.0, inositol pentaphosphate 5.0, benzotriazole 0.5, sodium molybdate 0.5, citric acid 0.5, sodium nitrate 3.5; surface treatment process parameters: the pH value of the metal surface treatment solution is 2.0, the pH is adjusted with sodium hydroxide and phosphoric acid, the temperature is 5°C, the time is 15 minutes, and soaking treatment is used; the preparation process of the chemical conversion coating on the metal surface: steel workpiece -→ Degreasing-→Washing-→Sand blasting-→Surface treatment-→Natural...

Embodiment 2

[0018] Using aluminum alloy as the base material, the polyurea anti-corrosion coating is prepared through the process of structural preprocessing, degreasing, water washing, sandblasting, surface treatment and spraying polyurea coating, which is implemented in the following ways: degreasing and water washing of aluminum alloy workpieces; sandblasting Coarse treatment, control the surface roughness of the substrate to 30 μm; surface treatment agent composition (g / L): inositol hexaphosphate 16.0, inositol pentaphosphate 8.0, inositol tetraphosphate 6.0, benzotriazole 0.2 , sodium tungstate 0.5, tartaric acid 1.0, sodium nitrate 1.0, sodium m-nitrobenzenesulfonate 0.3; surface treatment process parameters: the pH value of the metal surface treatment solution is 6.0, the pH is adjusted with sodium hydroxide and phosphoric acid, and the temperature is 25 ° C. The time is 10 minutes, and the spray treatment is adopted; the preparation process of the chemical conversion film is the sa...

Embodiment 3

[0020] Using galvanized steel as the base material, the polyurea anti-corrosion coating is prepared through the process of structural preprocessing, degreasing, water washing, sandblasting, surface treatment and spraying polyurea coating, which is implemented in the following ways: degreasing and water washing of galvanized steel workpieces; Sand blasting roughening treatment to control the surface roughness of the substrate to 50 μm; the composition of the surface treatment agent is (g / L): inositol hexaphosphate 14.0, inositol tetraphosphate 6.0, benzotriazole 0.3, sodium fluoroborate 0.5 , fluozirconic acid 0.5, tartaric acid 0.2, citric acid 0.5, sodium nitrate 1.5; surface treatment process parameters: the pH value of the metal surface treatment solution is 4.0, the pH is adjusted with sodium hydroxide and phosphoric acid, the temperature is 35 ° C, the time is 5 minutes, using Brush coating treatment; the preparation process of the chemical conversion film is the same as i...

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Abstract

The invention belongs to the field of metal anticorrosion and protection and relates to a preparation method of a metal surface chemical conversion film for polyurea anticorrosive coating. Metal surface treatment solution consists of inositol phosphate and composite additives, wherein the volume concentration of the inositol phosphate is 15.0-30.0g/L and the volume concentration of the composite additives is 3.0-5.0g/L; the inositol phosphate consists of two or three of inositol tetraphosphate, inositol pentaphosphate and inositol hexaphosphate; and the composite additives consist of at least three of sodium nitrate, benzotrizaole, sodium molybdate, sodium tungstate, citric acid, tartaric acid, sodium 3-nitrobenzene sulfonate, sodium fluoborate and hexafluorozirconic acid. A dipping, coating or spray treatment method is adopted. The preparation method is suitable for metal materials such as steel and iron, aluminum alloy, and galvanized steel and iron. After surface treatment is conducted, polyurea coating is sprayed. The bonding strength of the polyurea coating is larger than 10MPa.

Description

technical field [0001] The invention belongs to the field of metal corrosion and protection, in particular to a method for preparing a chemical conversion coating on a metal surface for polyurea anticorrosion coatings. Background technique [0002] Metal products must undergo phosphating treatment before the coating is applied to obtain a layer of porous chemical conversion film with a thickness of 3-10 μm—the phosphating film. The main functions of the phosphating film are: first, to improve the coating The bonding strength between the metal substrate and the second is to improve the overall performance of the coating. For low-viscosity liquid paint, it enters the micropores of the phosphating film through the penetration of the solvent, and the paint forms a mechanical bite with the metal substrate after the film is formed, so as to achieve the purpose of improving the bonding strength of the coating. Disadvantages of traditional phosphating treatment methods: 1) Many pho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/44
Inventor 管从胜徐国谦宋占昭张文强唐磊魏东
Owner SHANDONG UNIV
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