Method for improving paintable performance of surface of cold-rolled automobile sheet

An automotive sheet and coating technology, applied in the direction of metal material coating process, can solve problems such as poor coating performance of cold-rolled automotive sheets, and achieve the effects of improving cleanliness and surface energy, high cleanliness, and small porosity

Active Publication Date: 2022-03-25
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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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 that the existing method improves the poor paintability of cold-rolled automobile sheets

Method used

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  • Method for improving paintable performance of surface of cold-rolled automobile sheet
  • Method for improving paintable performance of surface of cold-rolled automobile sheet
  • Method for improving paintable performance of surface of cold-rolled automobile sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Embodiment 1 The total amount of residues (residual oil+residual iron) on the surface of chilled strip steel is 50mg / m 2 , the surface reflectance is 85%;

Embodiment 2

[0053] Embodiment 2 The total amount of residues (residual oil+residual iron) on the surface of chilled strip steel is 100mg / m 2 , the surface reflectance is 90%;

[0054] Table 2 pickling and cold rolling process

[0055]

[0056] 3. Carry out continuous annealing treatment to the chilled steel strip, and the specific process parameters are as shown in Table 3 to obtain annealed steel plate;

[0057] The average grain size of the annealed steel sheet in Example 1 is 10 μm, and the oxide film thickness is 3 μm;

[0058] The average grain size of the annealed steel sheet in Example 2 is 8 μm, and the oxide film thickness is 2 μm;

[0059] Table 3 Annealing process

[0060]

[0061] 4. Carry out smooth oiling treatment to the strip steel, and the specific process parameters are shown in Table 4;

[0062] Table 4 Leveling and oiling process

[0063]

[0064] 5. Use lye to carry out degreasing and degreasing treatment on the steel plate after the oil coating in Examp...

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Abstract

The invention discloses a method for improving the paintable performance of the surface of a cold-rolled automobile sheet, and belongs to the field of metal material surface treatment. The technological process of the method comprises the steps of smelting and casting, hot rolling and coiling, acid pickling and cold rolling, continuous annealing, leveling and oiling, oil removing and acid pickling, surface adjusting and phosphating. The surface phosphating film layer of the cold-rolled automobile sheet prepared by the method is compact in structure, uniform in crystallization, granular, small in porosity and high in paintable performance, the average grain size is 2-3 microns, and the problem that the paintable performance of the cold-rolled automobile sheet improved by an existing method is poor can be effectively solved.

Description

technical field [0001] The invention belongs to the field of surface treatment of metal materials, and in particular relates to a method for improving the paintability of the surface of a cold-rolled automobile sheet. Background technique [0002] The automobile steel plate should be phosphating before painting, the purpose is to form a uniform and dense phosphating film on the surface of the steel plate, so as to improve the corrosion resistance of the surface and enhance the adhesion of the primer. Therefore, the paintability of phosphating steel sheet is also an important indicator to measure whether it can be widely used in automobiles. The process of phosphating reaction on the surface of automobile steel plate determines the quality of its phosphating film formation. A uniform phosphating reaction not only requires the chemical composition and structure of the substrate to be evenly distributed before coating, but also requires no obvious element enrichment on the surf...

Claims

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Application Information

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IPC IPC(8): C22C33/04C21D8/02C21D1/26C23G5/06C23G1/08C23C22/18
CPCC22C33/04C21D8/0226C21D1/26C23G5/06C23G1/088C23G1/081C23C22/182
Inventor徐接旺郭太雄董学强冉长荣罗嘉庆赵平平
OwnerPANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP