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A method for improving the quality of passivation film of galvanized products

A passivation film and quality technology, applied in hot dip plating process, surface polishing machine tools, furnaces, etc., can solve problems such as low production efficiency, passivation patterns, etc., and achieve improved production efficiency, uniform passivation film, and service cycle. prolonged effect

Active Publication Date: 2022-07-19
广西柳钢华创科技研发有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is the problem of low production efficiency and common defects such as passivation spots and passivation patterns on the passivation surface

Method used

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  • A method for improving the quality of passivation film of galvanized products
  • A method for improving the quality of passivation film of galvanized products
  • A method for improving the quality of passivation film of galvanized products

Examples

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Embodiment

[0027] Table 1 is the roughness of the work roll of the finishing machine and the specific value of the roughness of the pick-up roll of the roller coater in the embodiment and the comparative example, figure 1 is the surface condition of Example 1, figure 2 is the surface condition of Example 2, image 3 It is the surface condition of Example 3; there are no defects such as passivation spots and passivation patterns on the surface.

[0028] Figure 4 is the surface condition of Comparative Example 1, Figure 5 It is the surface condition of Comparative Example 2; there are defects such as passivation patterns.

[0029] Table 1 Specific process parameters of each example and comparative example

[0030] example The roughness of the work roll of the finishing machine Ra, μm Roughness Ra of the pick-up roller of the roller coater, μm Defect ratio, % Example 1 0.33 0.02 1.23 Example 2 0.35 0.03 1.27 Example 3 0.42 0.02 2.35 Compar...

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Abstract

The invention discloses a method for improving the quality of a passivation film of a galvanized product. The method comprises: passing through a continuous annealing furnace, a zinc pot, a skin passer and a roll coater in sequence; and performing a passivation process in the roll coater; The roughness of the work roll of the finishing machine is 0.3-0.5μm, and the roughness of the pick-up roll of the roll coater is ≤0.03μm. The obtained galvanized product has excellent surface quality, no defects such as passivation spots and passivation patterns, the passivation film is uniform, and the structure is compact.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of steel plates, and particularly relates to a method for improving the quality of passivation films of galvanized products. Background technique [0002] Hot-dip galvanized sheet has good corrosion resistance and is widely used in manufacturing fields such as construction, home appliances, automobiles and aviation. However, galvanized products are still easily corroded when used in the air, especially in humid environments, and the coating will be oxidized to cause "white rust" defects on the surface. Therefore, the steel plate needs to be post-treated after galvanizing to further improve the anti-corrosion performance of the product. [0003] The current post-treatment method for producing high-quality galvanized sheets is usually passivation treatment by means of roller coating, that is, through a combination of rubber rollers or steel rollers, different transfer methods are adopted t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/26C21D9/52C23C2/06C23C2/40C23C2/26C23C22/77C23F17/00B24B1/00B24B29/02
CPCC21D1/26C21D9/52C23C2/06C23C2/40C23C2/26C23C22/77C23F17/00B24B1/00B24B29/02
Inventor 周博文蒋才灵阮志勇邓深杨跃标叶姜钱学海张应强贾朝鲜李祥石安豪
Owner 广西柳钢华创科技研发有限公司