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A kind of passivation solution and application thereof for passivation of electroplated zinc layer

A passivation solution, electro-galvanizing technology, applied in the direction of metal material coating process, etc., to achieve the effect of good anti-corrosion performance, simple method and operation, and beautiful color.

Inactive Publication Date: 2015-10-28
LUDONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of inorganic passivation galvanized layer, the core is to make the passivation film grow densely in order to improve the anti-corrosion performance; according to relevant literature reports, the current inorganic passivation technology is difficult to replace chromate passivation

Method used

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  • A kind of passivation solution and application thereof for passivation of electroplated zinc layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: HNO 3 The effect of dosage on the performance of passivation solution

[0030] The passivation solution formula is: potassium permanganate 2g / L, concentrated nitric acid 1, 2, 4, 6, 8, 10, 12ml / L (mass concentration 65-68%, the same as described below), sulfuric acid Aluminum 20g / L, sodium nitrate 10g / L, nickel sulfate 10g / L were mixed in deionized water to obtain 1L passivation solution. The operating temperature is room temperature, the galvanized workpiece is immersed in the above passivation solution for 25s, and the residence time in the air is 15s. After drying (or drying), it is aged at 80°C for about 15 minutes. When the pH is around 7, the temperature is 25-28°C, and the galvanized workpiece is immersed in 5% sodium chloride aqueous solution.

[0031] The results are: for the formulations corresponding to concentrated nitric acid 1, 2, 4, 6, 8, 10, and 12ml / L, the time for corrosion spots to appear on the galvanized workpiece is: 6, 18, 46, 72, 52,...

Embodiment 2

[0032] Example 2: KMnO 4 The effect of dosage on the performance of passivation solution

[0033] The passivation solution formula is: potassium permanganate 0.5, 1, 1.5, 2, 3, 4, 5g / L, concentrated nitric acid 6ml / L, aluminum sulfate 20g / L, sodium nitrate 10g / L, nickel sulfate 10g / L L, mixed in deionized water to obtain 1L passivation solution. The operating temperature is room temperature, the galvanized workpiece is immersed in the above passivation solution for 25s, and the residence time in the air is 15s. After drying (or drying), it is aged at 80°C for about 15 minutes. When the pH is around 7, the temperature is 25-28°C, and the galvanized workpiece is immersed in 5% sodium chloride aqueous solution.

[0034] The results are: for the formulations corresponding to potassium permanganate 0.5, 1, 1.5, 2, 3, 4, and 5g / L, the times for corrosion spots to appear are: 8, 36, 46, 72, 42, 26, and 22 hours; , low content of potassium permanganate passivation film is thin, the...

Embodiment 3

[0035] Example 3: AI 2 (SO 4 ) 3 The effect of dosage on the performance of passivation solution

[0036] The passivation solution formula is: potassium permanganate 2g / L, concentrated nitric acid 6ml / L, aluminum sulfate 0, 5, 10, 20, 30, 40g / L, sodium nitrate 10g / L, nickel sulfate 10g / L, Mix well in deionized water to obtain 1L passivation solution. The operating temperature is room temperature, the galvanized workpiece is immersed in the above passivation solution for 25s, and the residence time in the air is 15s. After drying (or drying), it is aged at 80°C for about 15 minutes. When the pH is around 7, the temperature is 25-28°C, and the galvanized workpiece is immersed in 5% sodium chloride aqueous solution.

[0037] The results are: for the formulations corresponding to aluminum sulfate 0, 5, 10, 20, 30, and 40g / L, the time for corrosion spots to appear is: 24, 42, 60, 72, 70, and 64h; in addition, there is no aluminum sulfate passivation film Rough, uneven color. ...

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Abstract

The invention relates to passivation liquid for passivation of an electroplating zinc coating. The passivation liquid per litre comprises 1 to 3 g of potassium permanganate, 4 to 10 ml of concentrated nitric acid with the mass concentration of 65 to 68 %, 5 to 30 g of aluminium sulfate, 8 to 10 g of sodium nitrate and 8 to 15 g of nickel sulfate, and the balance of water. The usage of the passivation liquid comprises the following steps: step 1, soaking a galvanized workpiece by the passivation liquid at the room temperature, step 2: staying the soaked galvanized workpiece in the air for 5 to 35 s, and then airing or blow-drying; step 3: ageing the aired or blow-dried galvanized workpiece at the temperature of 60 to 90 DEG C for 10 to 25 minutes. The passivation liquid and the processing method do not use carcinogenic chromate with high toxicity, and cannot pollute the environment. Besides, according to the processing method, the passivation liquid can form a dense film layer on the surface of the galvanized workpiece, is good in anticorrosion performance, cannot change the size of the workpiece, and is simple in operation method.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, more specifically, to a passivation solution used for passivation of an electro-galvanized layer and the application of the passivation solution in the passivation of an electro-galvanized layer. Background technique [0002] Zinc is an important non-ferrous metal. Electrogalvanizing is an effective way to improve the corrosion resistance of steel. It is currently widely used in aviation, transportation, electric power, ships, machinery and other fields. In a dry and clean atmosphere, the corrosion rate of zinc is very small, but in a humid environment, especially in a marine climate, the galvanized layer is easily corroded, so the galvanized layer needs to be passivated. Chromate passivation treatment is usually carried out, but due to the high toxicity and carcinogenicity of chromate, which will pollute the environment, it has been increasingly restricted by environmental protec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/53
Inventor 殷平张丕俭刘伟曲荣君刘希光唐清华徐强
Owner LUDONG UNIVERSITY
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