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Normal temperature slag-free phosphating solution before electrophoresis of galvanized steel sheet for automobile and preparation method thereof

A technology of galvanized steel sheet and phosphating solution, which is applied in the direction of electrophoretic plating, electrolytic coating, metal material coating technology, etc., to achieve the effects of increased adhesion, high value-added economic benefits, and long service life

Active Publication Date: 2017-11-14
陕西众联新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the technical problems existing in the existing phosphating solution, the present invention provides a slag-free phosphating solution at room temperature before electrophoresis of galvanized steel sheets for automobiles and a preparation method thereof

Method used

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  • Normal temperature slag-free phosphating solution before electrophoresis of galvanized steel sheet for automobile and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] Embodiment 1: The treatment liquid is calculated according to 1 L. Add water to the container at room temperature to 80%, add 1.6g of zinc oxide, start stirring until suspended, then slowly add 21.0g of phosphoric acid, stir until the solution is clear, add 9.5g of manganese nitrate solution and 3.5g of nickel nitrate, dissolve and then add 5.0g g sodium nitrate, 1.1 g hydroxylamine sulfate, 0.7 g sodium m-nitrobenzene sulfonate, 0.01 g copper nitrate, 0.2 g sodium molybdate and 1.2 g citric acid, and add another 0.4 g polyvinyl alcohol dissolved in appropriate amount of hot water. In another container, take 2.5g of fluotitanic acid solution and 0.8g of fluozirconic acid and dissolve in a solution containing an appropriate amount of hydrogen peroxide, add slowly after the above solution is completely dissolved, and continue to stir until the volume reaches 1L. A mixed solution containing sodium hydroxide and sodium carbonate is used to adjust the free acidity of the tre...

Embodiment 2

[0034]Embodiment 2: The treatment liquid is calculated according to 1 L. Add water to the container at room temperature to 80%, add 1.7g of zinc oxide, start stirring until suspended, then slowly add 22.0g of phosphoric acid, stir until the solution is clear, add 10.0g of manganese nitrate solution and 3.5g of nickel nitrate, dissolve and then add 6.0g g sodium nitrate, 1.2 g hydroxylamine sulfate, 0.8 g sodium m-nitrobenzene sulfonate, 0.02 g copper nitrate, 0.1 g sodium molybdate and 1.1 g citric acid, and add 0.3 g polyvinyl alcohol dissolved in appropriate amount of hot water. In another container, take 3.0 g of fluotitanic acid solution and 1.0 g of fluozirconic acid and dissolve in a solution containing an appropriate amount of hydrogen peroxide, add slowly after the above solution is completely dissolved, and continue to stir until the volume reaches 1 L. A mixed solution containing sodium hydroxide and sodium carbonate is used to adjust the free acidity of the treatmen...

Embodiment 3

[0037] Embodiment 3: The treatment liquid is calculated according to 1 L. Add water to the container at room temperature to 80%, add 1.8g of zinc oxide, start stirring until suspended, then slowly add 21.0g of phosphoric acid, stir until the solution is clear, add 10.5g of manganese nitrate solution and 4.0g of nickel nitrate, dissolve and then add 5.0g g sodium nitrate, 1.4 g hydroxylamine sulfate, 0.7 g sodium m-nitrobenzene sulfonate, 0.01 g copper nitrate, 0.2 g sodium molybdate and 1.3 g citric acid, and add another 0.5 g polyvinyl alcohol dissolved in appropriate amount of hot water. In another container, take 3.5 g of fluotitanic acid solution and 1.2 g of fluozirconic acid and dissolve them in a solution containing an appropriate amount of hydrogen peroxide, add slowly after the above solution is completely dissolved, continue to stir and set the volume to 1 L. A mixed solution containing sodium hydroxide and sodium carbonate is used to adjust the free acidity of the t...

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Abstract

The invention discloses a normal temperature slag-free phosphating solution before electrophoresis of galvanized steel sheets for automobiles and a preparation method thereof, belonging to the technical field of metal surface treatment. The components and contents of the phosphating solution are: ZnO: 1.6~1.8g / L; Ni(NO3)2·6H2O: 3.5~4.5g / L; Hydroxylamine sulfate 1.0~1.4g / L; Na2MoO4·2H2O: 0.1~ 0.2g / L; C6H8O7: 1.1~1.3g / L; NaNO3: 4~6g / L; 40wt% H2ZrF6 solution: 0.8~1.6g / L; 50wt% Mn(NO3)2·4H2O solution: 9~11g / L ;85wt% H3PO4 solution: 19~22g / L; Cu(NO3)2·3H2O: 0.01~0.02g / L; Polyvinyl alcohol: 0.3~0.5g / L; Sodium m-nitrobenzenesulfonate: 0.7~0.9g / L; 60% H2TiF6 solution: 2.5 ~ 4.0g / L; water: balance. The slag-free phosphating solution of the invention can be used at normal temperature, has a long service period and low use cost.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a slag-free phosphating solution at room temperature before electrophoresis of galvanized steel sheets for automobiles and a preparation method thereof. Background technique [0002] As an important metal surface pretreatment method, phosphating treatment process is widely used in the surface treatment and finishing of non-ferrous metals and ferrous metals to improve the corrosion resistance of the substrate and enhance the adhesion of the paint film. In recent years, with the rapid development of the automobile industry, more and more galvanized steel sheets have replaced the traditional cold-rolled steel sheets and are widely used in the automobile manufacturing industry. Since the surface activity of galvanized steel sheet is higher than that of ordinary steel sheet, and the adhesion to paint film is low, this also makes higher requirements for the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/44C25D13/20
Inventor 张千峰张创优李晓东蒯珊
Owner 陕西众联新材料科技有限公司
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