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Process of silane-zirconium salt conversion treatment before metal cathode electrophoresis coating

A technology of conversion treatment and electrophoretic coating, applied in metal material coating process, electrolytic coating, electrophoretic plating, etc., can solve problems such as uneven film formation, changes in the microstructure of the substrate surface, and poor self-repair performance, and achieve Improved alkali resistance, consistent electric field strength, and guaranteed integrity

Inactive Publication Date: 2013-04-10
ANHUI WEILAI SURFACE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The silane-zirconium salt conversion treatment on the metal surface has broad application prospects, but the zirconium salt conversion film formed by the existing technology has weak corrosion resistance, uneven film formation, and no "self-repair" or "self-repair" performance Inferior defects limit its development
[0005] In cathodic electrophoretic coating, the requirements for various indicators of the pretreatment film layer are more stringent, such as alkali resistance performance requirements, because the alkalinity enhancement during the electrophoresis process will destroy the zirconium salt conversion film layer, resulting in changes in the microstructure of the substrate surface. Seriously affect the performance of the overall coating

Method used

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  • Process of silane-zirconium salt conversion treatment before metal cathode electrophoresis coating

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Embodiment 1

[0032] The use of Angang cold-rolled sheet, due to cathodic electrophoresis technology, has requirements for smoothness and cleanliness on the surface of metal samples. Therefore, it is first necessary to carry out surface pretreatment on Angang cold-rolled sheet, and the process route is: pre-degreasing → degreasing → water washing → deionized water washing → silane-zirconium salt conversion treatment → deionized water washing → drying.

[0033] The degreasing solution is a mixed solution of MC-3011 and RT-188W. Degreasing is carried out at room temperature to 30°C, and the soaking time is 10 minutes according to the amount of oil stain on the sample.

[0034] Immediately after water washing and deionized water washing, the silane-zirconium salt conversion treatment is carried out. The weight of each component of the raw materials per liter of the treatment agent is: 20g of silane coupling agent KH-460, 40g of absolute ethanol, 10g of fluorozirconic acid, fluorine Sodium chlo...

Embodiment 2

[0043] To use Maanshan Iron and Steel’s cold-rolled sheet, it is first necessary to carry out surface pretreatment on the cold-rolled sheet. The process route is: pre-degreasing → degreasing → water washing → deionized water washing → silane-zirconium salt conversion treatment → deionized water washing → drying.

[0044] The degreasing solution is a mixed solution of MC-3011 and RT-188W, the degreasing is carried out at 40-50°C, and the soaking time is 30 minutes according to the amount of oil stain on the sample.

[0045] Immediately after water washing and deionized water washing, the silane-zirconium salt conversion treatment is carried out. The weight of each component of the raw materials per liter of the treatment agent is: silane coupling agent KH-46050g, absolute ethanol 20g, fluorozirconic acid 30g, fluorinated zirconium acid Sodium 3g, sodium edetate 0.4g, triethanolamine salicylate 5g.

[0046] The cold-rolled sheet sample after the silane-zirconium salt conversion ...

Embodiment 3

[0054]To use Shougang’s cold-rolled sheet, it is first necessary to carry out surface pretreatment on the cold-rolled sheet. The process route is: pre-degreasing → degreasing → water washing → deionized water washing → silane-zirconium salt conversion treatment → deionized water washing → drying.

[0055] The degreasing solution is a mixed solution of MC-3011 and RT-188W, and the degreasing is carried out at 30-40°C, and the immersion time is 20 minutes according to the amount of oil stain on the sample.

[0056] Immediately after water washing and deionized water washing, the silane-zirconium salt conversion treatment is carried out. The weight of each component of the raw materials per liter of the treatment agent is: 30g of silane coupling agent KH-460, 30g of absolute ethanol, 20g of fluorozirconic acid, fluorine Sodium chloride 4g, sodium edetate 0.2g, triethanolamine salicylate 7g.

[0057] The cold-rolled sheet sample after the silane zirconium salt conversion treatment...

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Abstract

The invention relates to the field of metal surface treatment, and particularly relates to a process of silane-zirconium salt conversion treatment before metal cathode electrophoresis coating. A technology of silane-zirconium salt conversion treatment before cathode electrophoresis coating is adopted, i.e. a silanization treatment technology and a zirconium salt conversion technology are successfully fused, so that silane and a zirconium salt conversion film are hybridized, thus forming a silane-zirconium salt conversion hybrid film on the metal surface. Compared with the simple zirconium salt conversion film, the corrosion resistance (especially the alkali resistance) of the hybrid film is greatly enhanced, thereby ensuring the integrity of the zirconium salt conversion film under an alkaline environment in the electrophoresis process and further ensuring the adhesive force between the paint and the matrix. The hybrid film has the advantages of high corrosion resistance, compactness, uniformity, low resistance, good adhesive force and the like.

Description

technical field [0001] The invention relates to the field of metal surface treatment, in particular to a silane-zirconium salt conversion treatment process before metal cathodic electrophoretic coating. Background technique [0002] In metal surface treatment, the quality of substrate surface treatment directly affects the adhesion, appearance and corrosion resistance of the coating. Although traditional phosphate conversion and chromate passivation surface treatment technologies can achieve good results, the waste liquid discharged during the treatment process contains heavy metal ions such as zinc, manganese, nickel, chromium, and carcinogens such as nitrite, which are harmful to the environment. Environmental pollution is very serious. The metal surface silane-zirconium salt conversion treatment technology is considered to be expected to replace phosphate conversion treatment and chromate passivation treatment because it does not involve substances in a hazardous environ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D13/20C23C22/34
CPCC23C2222/20
Inventor 童学宝
Owner ANHUI WEILAI SURFACE TECH
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