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Zinc-coated steel plate surface passivation technology

A galvanized steel sheet and process technology, which is applied in the field of surface passivation of galvanized steel sheet to achieve the effect of improving corrosion resistance and overcoming high toxicity

Inactive Publication Date: 2015-02-11
WUXI SHITANGWAN IND PARK DEV CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a surface passivation process for galvanized steel sheets. The passivation solution used in the process has no trivalent chromium and hexavalent chromium, completely overcomes the environmental pollution defects of chromium, and simultaneously adopts the passivation solution prepared by the passivation solution. The film has good corrosion resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A galvanized steel surface passivation process, the composition of the passivation solution used in the process is: sodium silicate 22g / L, calcium silicate 8g / L, sodium borate 6.5g / L, potassium peroxide 10g / L, lemon Sodium acid 5g / L, 68%HNO 3 22ml / L, 70%H 2 SO 4 24ml / L, magnesium lauryl sulfate 5g / L, surplus is water; Described passivation process is:

[0014] 1) Pickling: Wash the galvanized steel sheet with 3% nitric acid solution for 8 seconds, then rinse with water;

[0015] 2) Passivation: Prepare the passivation solution with the above composition and put it in the passivation tank, dilute the passivation solution according to the ratio of passivation solution: water 1:9, then make the pH value 2.5, the temperature is 55 ℃, Put the pickled galvanized steel plate into it and passivate it for 200 seconds.

Embodiment 2

[0017] A kind of galvanized steel plate surface passivation process, the composition of the passivation liquid that this process adopts is: sodium silicate 24g / L, calcium silicate 6g / L, sodium borate 7.5g / L, potassium peroxide 8g / L, lemon Sodium acid 7g / L, 68%HNO 3 20ml / L, 70%H 2 SO 4 26ml / L, magnesium lauryl sulfate 3g / L, surplus is water; Described passivation process is:

[0018] 1) Pickling: Wash the galvanized steel sheet with 5% nitric acid solution for 4 seconds, then rinse with water;

[0019] 2) Passivation: Prepare the passivation solution with the above composition and put it in the passivation tank, dilute the passivation solution according to the ratio of passivation solution: water 1:11, then make the pH value 1.5, and the temperature is 65°C, Put the pickled galvanized steel sheet into it and passivate it for 180 seconds.

Embodiment 3

[0021] A galvanized steel surface passivation process, the passivation solution used in the process consists of: sodium silicate 23g / L, calcium silicate 7g / L, sodium borate 7.0g / L, potassium peroxide 9g / L, lemon Sodium acid 6g / L, 68%HNO 3 21ml / L, 70%H 2 SO 4 25ml / L, magnesium lauryl sulfate 4g / L, surplus is water; Described passivation process is:

[0022] 1) Pickling: Wash the galvanized steel sheet with 4% nitric acid solution for 6 seconds, then rinse with water;

[0023] 2) Passivation: Prepare a passivation solution with the above composition and put it in the passivation tank, dilute the passivation solution according to the ratio of passivation solution: water 1:10, then make the pH value 2.0, and the temperature is 60°C, Put the pickled galvanized steel sheet into it and passivate it for 190 seconds.

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PUM

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Abstract

The invention discloses a zinc-coated steel plate surface passivation technology. Each liter of a passivating liquid used in the technology is composed of the following components: 22 to 24 grams of sodium silicate, 6 to 8 grams of calcium silicate, 6.5 to 7.5 grams of sodium borate, 8 to 10 grams of potassium peroxide, 5 to 7 grams of sodium citrate, 22-22 mL of HNO3 (68%), 24 to 26 mL of H2SO4 (70%), 3 to 5 grams of dodecyl magnesium sulfate, and the balance being water. The passivation technology comprises the following steps: (1) acid washing: washing a zinc-coating steel plate for 4 to 8 seconds by a nitric acid solution with a concentration of 3 to 5%, and then washing by water; (2) passivating: filling a passivation tank with the prepared passivating liquid, diluting the passivating liquid by water, wherein the ratio of the passivating liquid to water is 1:9-11, adjusting the diluted passivating liquid to 1.5 to 2.5, controlling the temperature at a range of 55 to 65 DEG C, soaking the acid-washed zinc-coated steel plate into the diluted passivating liquid, and carrying out passivation for 180 to 220 seconds.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to a surface passivation process for galvanized steel sheets. Background technique [0002] Corrosion and anti-corrosion are related to economic development and people's life safety. Surface engineering technology is the most economical and effective means and method to solve the corrosion and protection of mechanical parts and materials. [0003] Galvanizing and zinc-iron alloys are effective ways to improve the corrosion resistance of steel parts, and are widely used in many fields such as shipbuilding industry, machinery industry, aviation, and construction. However, in a humid environment, especially in a hot and humid environment, the galvanized and zinc-iron alloy layers are prone to corrosion, causing the surface of the coating to form a dark gray or white loose corrosion product - white rust; after a long time, red rust will appear, thus losing antiseptic effect. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/53
CPCC23C22/53
Inventor 庄进
Owner WUXI SHITANGWAN IND PARK DEV CONSTR
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