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Blue write chromate-free passivation liquid of electrogalvanized layer and method for passivating electrogalvanized layer by adopting same

A chromium-free passivation and electro-galvanizing technology, applied in metal material coating process and other directions, can solve the problem of toxic hexavalent chromium in passivation solution, and achieve the effect of increased density and excellent corrosion resistance.

Inactive Publication Date: 2010-12-08
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of toxic hexavalent chromium in the existing passivation solution, and to provide a blue-white chromium-free passivation solution for the electro-galvanized layer and to passivate the electro-galvanized layer with the blue-white chromium-free passivation solution Methods

Method used

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  • Blue write chromate-free passivation liquid of electrogalvanized layer and method for passivating electrogalvanized layer by adopting same
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  • Blue write chromate-free passivation liquid of electrogalvanized layer and method for passivating electrogalvanized layer by adopting same

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specific Embodiment approach 1

[0012] Specific embodiment 1: In this embodiment, the blue and white chromium-free passivation solution of the electro-galvanized layer is composed of molybdate, phosphate, sulfuric acid and organic matter. The concentration is 10g / L~50g / L, the concentration of phosphate is 5g / L~35g / L, the concentration of sulfuric acid is 1ml / L~10ml / L, the concentration of organic matter is 3g / L~30g / L, and the pH is 3~5.

[0013] The blue and white chromium-free passivation solution of the electro-galvanized layer in this embodiment does not contain highly toxic substances, and the passivation solution has good stability, and its stability time exceeds 30 days.

specific Embodiment approach 2

[0014] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the molybdate is a mixture of sodium molybdate and ammonium molybdate, sodium molybdate or ammonium molybdate. Others are the same as the first embodiment.

[0015] In the present embodiment, when the molybdate is a mixture of sodium molybdate and ammonium molybdate, each component has an arbitrary ratio.

specific Embodiment approach 3

[0016] Specific embodiment three: This embodiment is different from specific embodiment one in that the phosphate is sodium phosphate. Others are the same as the first embodiment.

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Abstract

The invention relates to a blue write chromate-free passivation liquid of an electrogalvanized layer and a method for passivating the electrogalvanized layer by adopting the same, belonging to a chromate-free passivation liquid and a passivating method thereof. The invention solves the problem that the traditional passivation liquid contains toxic hexavalent chromium. The chromate-free passivation liquid contains molybdate, phosphate, sulfuric acid and organic matter. The passivating method comprises the steps of: dipping a treated galvanized steel sheet into the blue write chromate-free passivation liquid of the electrogalvanized layer with a temperature of 20-60 DEG C for passivating for 20-80s; and washing and drying to complete the process of passivating the electrogalvanized layer of the blue write chromate-free passivation liquid. The chromate-free passivation liquid does not contain the toxic hexavalent chromium and has good stability and stabilizing time exceeding 30 days.

Description

Technical field [0001] The invention relates to a chromium-free passivation solution and a passivation method. Background technique [0002] Electro-galvanizing is a steel protection method widely used at home and abroad, and it is widely used in many fields such as shipbuilding industry, machinery industry, aviation, and construction. However, the galvanized layer is prone to corrosion in a hot and humid environment, causing dark gray or white loose corrosion products on the surface of the zinc layer, which not only affects the appearance quality, but also fails to meet the protective requirements of the coating. In order to further improve the corrosion resistance and decorative effect of the galvanized layer, it must be passivated. Passivation treatment is generally divided into chromate passivation and chromium-free passivation according to whether the passivation solution contains chromium. [0003] At present, the chromate passivation process is commonly used, which has the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/47C23C22/42
CPCC23C22/42C23C22/47
Inventor 杨培霞崔莹刘磊张锦秋安茂忠
Owner HARBIN INST OF TECH
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