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Chromium-free inactivating liquid used for galvanized steel sheet surface

A technology of chromium-free passivation and galvanized steel sheet, applied in the field of passivation solution, can solve the problems of difficulty in satisfying users, satisfactory corrosion resistance of chromium-free passivation solution, etc., and achieve the effect of qualified product quality

Inactive Publication Date: 2008-08-06
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, so far, there is still no chromium-free passivation solution whose corrosion resistance satisfies people, and it is difficult to meet the requirements of users.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of passivation solution:

[0023] Take: sodium molybdate 80g / L, sodium tungstate 25g / L, acrylic acid 35g / L, hydrogen peroxide 30g / L, phytic acid 10g / L, the rest is water, and phosphoric acid is used to adjust the pH value to 1.6.

[0024] Put the passivated sample in the salt spray box, and refer to the ISO3768 standard, after 72 hours of neutral salt spray corrosion test, the "white rust" on the surface of the sample is less than 8%, indicating that the corrosion resistance of the passivation film is good.

Embodiment 2

[0026] Preparation of passivation solution:

[0027] Potassium molybdate 93g / L, potassium tungstate 22g / L, acrylic acid 30g / L, hydrogen peroxide 25g / L, phytic acid 5g / L, the rest is water, and phosphoric acid is used to adjust the pH value to 2.0.

[0028] Put the passivated sample in the salt spray box, refer to the ISO3768 standard, and after 72 hours of neutral salt spray corrosion test, the "white rust" on the surface of the sample is less than 5%, indicating that the corrosion resistance of the passivation film is good.

Embodiment 3

[0030] Preparation of passivation solution:

[0031] Sodium molybdate 100g / L, sodium tungstate (potassium) 30g / L, acrylic acid 35g / L, hydrogen peroxide 20g / L, phytic acid 10g / L, the rest is water, and phosphoric acid is used to adjust the pH value to 2.3.

[0032] Put the passivated sample in the salt spray box, refer to the ISO3768 standard, and after 78 hours of neutral salt spray corrosion test, the "white rust" on the surface of the sample is less than 5%, indicating that the corrosion resistance of the passivation film is good.

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Abstract

The invention relates to chromium-free passivation solution of galvanized coating, which solves the defect in an existing technique that the corrosion resistance of passive film is far different from the corrosion resistance of the passive film which adopts chromate originally. The technical measure is to use the chromium-free passivation solution on the surface of galvanized steel sheet, the chromium-free passivation solution is characterized in that components of the passivation solution and the method for preparing are that: molybdate: 80-160g / L, tungstate: 16-32g / L, acrylic acid: 15-50g / L, hydrogen peroxide: 20-40g. / L, and phytic acid: 5-10g / L, others are water, the pH value is 1.5-2.5, and phosphoric acid is used to regulate the pH value. The passivation solution of the invention does not contain chromium which pollutes environment and is environmental protection type passivation solution, the fog-corrosion retardancy resistance of passive film is equivalent to that of chromate passive film, the equipment conditions are not changed, and the product quality is qualified and satisfies the requirements of users.

Description

technical field [0001] The invention relates to a passivation solution for a galvanized layer, in particular to a chrome-free passivation solution for the surface of a galvanized steel sheet. Background technique [0002] After galvanized products come off the production line, due to changes in air temperature and humidity or after a period of storage, condensation will occur on the surface of the zinc layer, causing rust (white rust) or discoloration (gray). In order to prevent corrosion of galvanized products during transportation and storage, manufacturers of galvanized products must carry out surface passivation treatment. [0003] The traditional passivation treatment is chromate treatment. After chromate treatment, a passivation film is formed on the surface of zinc, which has good isolation performance and self-repairing function, so that the zinc coating has good corrosion resistance. Although the chromate passivation film has a good protective effect on the galvan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/40C23C22/42
Inventor 张万灵刘建容陈勇涂元强黄先球蔡捷
Owner 武钢集团有限公司
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