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Passivation liquid for passivation of electroplating zinc coating and application of same

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

Inactive Publication Date: 2013-11-27
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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: HNO 3 Influence of dosage on the performance of passivation liquid

[0030] The formula of passivation solution is: potassium permanganate 2g / L, concentrated nitric acid is 1, 2, 4, 6, 8, 10, 12ml / L (mass concentration 65-68%, the following is the same), sulfuric acid Aluminum 20g / L, sodium nitrate 10g / L, nickel sulfate 10g / 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 immediately aged at 80℃ for about 15min. When the pH is about 7, the temperature is 25-28°C, and the galvanized workpiece is immersed in 5% sodium chloride aqueous solution.

[0031] The result is: for the formula corresponding to concentrated nitric acid 1, 2, 4, 6, 8, 10, and 12ml / L, the corrosion point time of the galvanized workpiece is 6, 18, 46, 72, 52, 20, 8h; In addition, the...

Embodiment 2

[0032] Example 2: KMnO 4 Influence of dosage on the performance of passivation liquid

[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, mix well in deionized water to get 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 immediately aged at 80℃ for about 15min. When the pH is about 7, the temperature is 25-28°C, and the galvanized workpiece is immersed in 5% sodium chloride aqueous solution.

[0034] The result is: for the formula corresponding to potassium permanganate 0.5, 1, 1.5, 2, 3, 4, 5g / L, the time of appearance of corrosion points are: 8, 36, 46, 72, 42, 26, 22h; , The passivation film with low potassium permanganate content is thin and the color is ve...

Embodiment 3

[0035] Example 3: AI 2 (SO 4 ) 3 Influence of dosage on the performance of passivation liquid

[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 immediately aged at 80℃ for about 15min. When the pH is about 7, the temperature is 25-28°C, and the galvanized workpiece is immersed in 5% sodium chloride aqueous solution.

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

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PUM

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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, and more specifically, to a passivation solution 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, and electro-galvanized zinc 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. Zinc has a low corrosion rate in a dry and clean atmosphere, but in a humid environment, especially in a marine climate, the galvanized layer is prone to corrosion. Therefore, the galvanized layer needs to be passivated. Chromate passivation is usually carried out, but because chromate is highly toxic and carcinogenic, it will cause pollution to the environment, which has been restricted by the increasingly stringent environmen...

Claims

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Application Information

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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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