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Zinc layer surface conversion film forming liquid, and application method thereof

A technology of converting into and film liquid, applied in the direction of metal material coating process, etc., to achieve the effect of stable performance, wide industrial application value, and excellent corrosion resistance

Inactive Publication Date: 2011-11-09
北京小铱新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main problem of the current rare earth conversion coating technology is that the conversion liquid must contain hydrogen peroxide, and the unstable nature of hydrogen peroxide leads to unstable process operation and product performance, which cannot be applied to industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Preprocessing steps:

[0040] First, immerse the galvanized material in a NaOH solution with a temperature of 20°C and a mass content of 3% for 10 seconds to complete the alkali cleaning treatment to remove oxides on the surface of the galvanized layer;

[0041] Then, after the alkali-washed galvanized material is washed with water, it is immersed in a 3% nitric acid solution at room temperature for 3 to 5 seconds, and then rinsed with deionized water;

[0042] Preparation of zinc layer surface conversion film-forming solution:

[0043] Take 5.0 mmol of ceric sulfate, 40 mmol of sodium iodide, 9.0 mmol of trisodium phosphate, 0.5 mmol of sodium metavanadate, 250 mmol of sodium silicate, and 12 mmol of sodium fluorosilicate, respectively, and place them in 1000 ml of water, and adjust them with sulfuric acid to make them The pH of the film-forming solution on the surface of the zinc layer is 1.5, and the concentration of cerium ions is 5.0 mmol / L, the concentration of i...

Embodiment 2

[0047] The pretreatment steps are the same as in Example 1. Alkaline washing treatment uses 1% NaOH solution by mass content, and light treatment uses nitric acid solution with 5% mass content.

[0048] Preparation of zinc layer surface conversion film-forming solution:

[0049] Take 4.5 mmol of cerium nitrate, 84 mmol of potassium bromide, 6 mmol of sodium hexametaphosphate, 20 mmol of ammonium metavanadate, 4 mmol of ammonium silicate, and 250 mmol of ammonium fluorosilicate in 1000 ml of water, and adjust the surface of the zinc layer with sulfuric acid. The pH of the film-forming solution is 1.5, the concentration of cerium nitrate is 4.5 mmol / L, the concentration of potassium bromide is 84 mmol / L, the concentration of sodium hexametaphosphate is 6 mmol / L, the concentration of ammonium metavanadate is 20mmol / L, and the concentration of ammonium silicate 4 mmol / L, ammonium fluorosilicate 250 mmol / L zinc layer surface into a film liquid;

[0050] Conversion into film s...

Embodiment 3

[0053] The pretreatment steps are the same as in Example 1. Alkaline washing treatment uses 5% NaOH solution by mass content, and light treatment uses 1% nitric acid solution by mass content.

[0054] Preparation of zinc layer surface conversion film-forming solution:

[0055] Take 2.5 mmol of ceric sulfate, 40 mmol of sodium iodide, 3.2 mmol / L of sodium hexametaphosphate, 50 mmol of potassium metavanadate, 4 mmol of potassium silicate, and 4 mmol of potassium fluorosilicate in 1000ml of water, and adjust with sulfuric acid. The pH of the film-forming solution on the surface of the zinc layer is 2.0, and the concentration of ceric sulfate is 2.5 mmol / L, the concentration of sodium iodide is 40 mmol / L, the concentration of sodium hexametaphosphate is 3.2 mmol / L, and the concentration of potassium metavanadate is 50 mmol / L, potassium silicate 4 mmol / L, potassium fluorosilicate 4 mmol / L, the surface of the zinc layer is transformed into a film liquid;

[0056] Conversion into ...

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PUM

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Abstract

The invention discloses a zinc layer surface conversion film forming liquid, and an application method of the film forming liquid. The prepared zinc layer surface conversion film forming liquid is an aqueous solution with a pH value of 0.5 to 2, where in the pH value is regulated by nitric acid or sulfuric acid. The film forming liquid is prepared from cerium salt, halide, phosphate, meta-vanadate, fluorosilicate and water. The method comprises the steps that: a surface oxide layer of a galvanized material is removed through alkali washing and desmutting treatments; the treated galvanized material is immersed in the zinc layer surface conversion film forming liquid for 30 seconds to 30 minutes under a temperature of 10 DEG C to 70 DEG C; such that a conversion film is formed on the surface of the galvanized material. The formed conversion film has a uniform color and an excellent anti-corrosion performance. The film forming liquid and the method provided by the invention have values to be widely applied in industrial productions.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and relates to the surface treatment of a galvanized layer or a zinc alloy, in particular to a zinc layer surface conversion film-forming liquid and a use method thereof. [0002] Background technique [0003] Steel is the most widely used metal in industry and daily life. In 2008, my country's total steel output exceeded 500 million tons, equivalent to the total output of the world's top ten steel-producing countries. However, steel is a metal that is easily corroded. Every 90 seconds in the world, one ton of steel is corroded into rust. Galvanizing is an effective method to improve the resistance of steel and other materials to atmospheric corrosion. However, in a humid environment, the galvanized layer is prone to corrosion, and white loose corrosion products (white rust) are easily formed on the surface, and the galvanized layer that has been converted can prolong the rust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/44
Inventor 郭瑞光陆鑫
Owner 北京小铱新材料科技有限公司
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