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Normal-temperature non-slag phosphating solution used before electrophoresis of galvanized steel sheet for automobile and preparation method of normal-temperature non-slag phosphating solution

A technology of galvanized steel sheet and phosphating solution, applied in electrophoretic plating, electrolytic coating, metal material coating process, etc., to reduce environmental pollution, enhance electrophoretic compatibility, and increase adhesion

Active Publication Date: 2016-03-02
羊芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 non-slag phosphating solution used before electrophoresis of galvanized steel sheet for automobile and preparation method of normal-temperature non-slag phosphating solution

Examples

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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 to stir 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 them in a solution containing an appropriate amount of hydrogen peroxide. After the above solution is completely dissolved, add slowly, continue to stir and set the volume to 1L. A mixed solution containing sodium hydroxide and sodium carbonate is used to adjust the free acidity of the treat...

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 non-slag phosphating solution used before electrophoresis of a galvanized steel sheet for an automobile and a preparation method of the normal-temperature non-slag phosphating solution and belongs to the technical field of metal surface treatment. The phosphating solution comprises 1.6%-1.8 g / L of ZnO, 3.5%-4.5 g / L of Ni(No3)2.6H2O, 1.0-1.4 g / L of hydroxylamine sulphate, 0.1-0.2 g / L of Na2MoO4.2H2O, 1.1-1.3 g / L of C6H8O7, 4-6 g / L of NaNO3, 0.8-1.6 g / L of a 40 wt% H2ZrF6 solution, 9-11 g / L of a 50 wt% Mn(NO3) 2.4H2O solution, 19-22 g / L of a 85 wt% H3PO4 solution, 0.01-0.02 g / L of a Cu(NO3)2.3H2O solution, 0.3-0.5 g / L of polyvinyl alcohol, 0.7-0.9 g / L of sodium 3-nitrobenzene sulfonate, 2.5-4.0 g / L of a 60% H2TiF6 solution, and the balance water. The non-slag phosphating solution can be used at the normal temperature and is long in service life and low in 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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IPC IPC(8): C23C22/44C25D13/20
Inventor 张千峰张创优李晓东蒯珊
Owner 羊芳
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