Control method of surface cracks of passivated membrane of chromium-free passivated galvanized plate

A control method, chrome-free passivation technology, applied in hot-dip plating process, metal material coating process, coating, etc., can solve the problem of easy cracking or falling off, affecting the corrosion resistance of chrome-free passivated galvanized sheet, etc. problems, to achieve the effect of improving salt spray corrosion resistance, strong adhesion, and improving technical effects

Inactive Publication Date: 2016-02-03
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The application provides a method for controlling cracks on the surface of the passivation film of a chromium-free passivated galvanized sheet, which solves or partially solves the phenomenon that the surface of the passivation film of a chromium-free passivated galvanized sheet is often prone to cracking or falling off in the prior art , a technical problem that seriously affects the corrosion resistance of chromium-free passivated galvanized sheets, and a technology that effectively avoids the generation of surface cracks of chromium-free passivated galvanized sheets and improves the salt spray corrosion resistance of chromium-free passivated galvanized sheets Effect

Method used

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  • Control method of surface cracks of passivated membrane of chromium-free passivated galvanized plate
  • Control method of surface cracks of passivated membrane of chromium-free passivated galvanized plate
  • Control method of surface cracks of passivated membrane of chromium-free passivated galvanized plate

Examples

Experimental program
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Effect test

Embodiment 1

[0036] S1: Galvanize the steel plate on the hot-dip galvanizing line to produce a galvanized sheet.

[0037] S2: After cleaning the galvanized sheet, blow nitrogen gas through an air knife to dry it.

[0038] S3: skin pass treatment is performed on the dried galvanized sheet; wherein, the skin pass treatment is completed by a skin pass machine, and the conductivity of the skin pass solution sprayed out by the skin pass machine is 120 μS.

[0039] S4: Passivate the galvanized sheet after passivation to produce a passivated galvanized sheet; the strip tension during the passivation process is controlled at 15MPa; the pH value of the chromium-free passivation solution is controlled at 3; The temperature of the chemical solution was controlled at 25°C.

[0040] S5: Clean the surface of the passivated galvanized sheet by rinsing with clean water.

[0041] S6: Drying the passivated galvanized sheet; during the drying process, the temperature on the surface of the passivated galvan...

Embodiment 2

[0044] S1: Galvanize the steel plate on the hot-dip galvanizing line to produce a galvanized sheet.

[0045] S2: After cleaning the galvanized sheet, spray air to dry it.

[0046] S3: skin pass treatment is performed on the dried galvanized sheet; wherein, the skin pass treatment is completed by a skin pass machine, and the conductivity of the skin pass solution sprayed out by the skin pass machine is 80 μS.

[0047] S4: Passivate the galvanized sheet after passivation to produce a passivated galvanized sheet; the tension of the strip steel during the passivation treatment is controlled at 30MPa; the pH value of the chrome-free passivation solution is controlled at 3; The temperature of the chemical solution was controlled at 25°C.

[0048] S5: Clean the surface of the passivated galvanized sheet by rinsing with clean water.

[0049] S6: Drying the passivated galvanized sheet; during the drying process, the temperature on the surface of the passivated galvanized sheet is con...

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Abstract

The invention relates to a control method of surface cracks of a passivated membrane of a chromium-free passivated galvanized plate. The method includes the steps that a steel plate on a hot galvanizing production line is subjected to galvanizing treatment, and the galvanized plate is generated; after being washed clean, the galvanized plate is dried through an air knife; the dried galvanized plate is subjected to finishing; the finished galvanized plate is passivated, and the passivated galvanized plate is generated; the surface of the passivated galvanized plate is cleaned; the passivated galvanized plate is dried. The control method effectively avoids the surface cracks of the chromium-free passivated galvanized plate, and the salt-spray corrosion resistance of the chromium-free passivated galvanized plate is improved.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a method for controlling cracks on the surface of a passivation film of a chromium-free passivation galvanized sheet. Background technique [0002] In recent years, with the continuous improvement of the corrosion resistance of the zinc layer on the surface of hot-dip galvanized sheets, major home appliance companies have put forward higher and higher requirements for the salt spray corrosion resistance of galvanized products. The traditional galvanized sheet adopts the chromium passivation process. The traditional passivation treatment mostly uses hexavalent chromium compounds such as chromic acid and chromate as the treatment agent. After the treatment, the chromate conversion film formed on the metal surface will affect the base metal Has good corrosion protection. The chromium in the film layer mainly exists in the form of trivalent chromium and hexavalent chromium, amon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/73C23C2/40C23C2/20C23C2/26
Inventor 李研张亮亮鲍成人郑艳坤王保勇张秋生张学斌黄学启高小丽滕华湘崔阳刘鸿明
Owner SHOUGANG CORPORATION
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