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Pre-phosphated electrogalvanized automobile outer panel with friendly coating and manufacturing method thereof

A pre-phosphating and electro-galvanizing technology, which is applied in the coating process of metal materials, can solve problems such as poor compatibility and poor electrophoresis, and achieve the effects of improving adhesion, reducing phosphating residues, and improving protection

Inactive Publication Date: 2020-06-30
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a coating-friendly pre-phosphating electrogalvanized automobile outer panel for the problems of poor compatibility between the surface of the existing galvanized steel sheet and the coating process of the automobile factory, which may easily lead to poor electrophoresis, etc. On the premise of good tensile, stamping and other applicable properties, it has good coating performance, and the preparation method involved is simple, suitable for popularization and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A coating-friendly pre-phosphating electrogalvanized automobile outer panel, the preparation method of which comprises the following steps:

[0023] 1) Smelting and casting: The steel plate substrate adopts an ultra-low carbon composition system containing Nb, and the components and their mass percentages are: C 0.0008%, Si 0.008%, Mn 0.12%, P 0.008%, S 0.006%, Nb 0.025%, Als 0.03%, N≤0.003%, the rest is iron and unavoidable impurities; smelting and casting according to the above formula to obtain slabs;

[0024] 2) hot rolling and coiling; the slab obtained in step 1) is subjected to hot rolling, water spray cooling and coiling, and the specific process conditions include: finish rolling temperature 940°C; water spray cooling, coiling temperature 720°C;

[0025] 3) Cold rolling, continuous annealing, leveling: the cold rolling process controls the total reduction rate to 82%; then the obtained cold rolled sheet is continuously annealed, the soaking temperature is contr...

Embodiment 2

[0030] A coating-friendly pre-phosphating electrogalvanized automobile outer panel, the preparation method of which comprises the following steps:

[0031] 1) Smelting and casting: The steel plate substrate adopts an ultra-low carbon composition system containing Nb, and the components and their mass percentages are: C 0.001%, Si 0.01%, Mn 0.10%, P 0.008%, S 0.006%, Nb 0.025%, Als 0.025%, N≤0.003%, the rest is iron and unavoidable impurities; smelting and casting according to the above formula to obtain slabs;

[0032]2) hot rolling and coiling; the slab obtained in step 1) is subjected to hot rolling, water spray cooling and coiling, and the specific process conditions include: finish rolling temperature 940°C; water spray cooling, coiling temperature 730°C;

[0033] 3) Cold rolling, continuous annealing, leveling: the cold rolling process controls the total reduction rate to 82%; then the obtained cold rolled sheet is continuously annealed, the soaking temperature is control...

Embodiment 3

[0038] A coating-friendly pre-phosphating electrogalvanized automobile outer panel, the preparation method of which comprises the following steps:

[0039] 1) Smelting and casting: the steel plate substrate adopts an ultra-low carbon composition system containing Nb, and the components and their mass percentages are: C 0.001%, Si 0.006%, Mn 0.16%, P 0.01%, S 0.007%, Nb 0.028%, Als 0.025%, N≤0.003%, the rest is iron and unavoidable impurities; smelting and pouring according to the above formula to obtain slabs;

[0040] 2) hot rolling and coiling; the slab obtained in step 1) is subjected to hot rolling, water spray cooling and coiling, and the specific process conditions include: finish rolling temperature 930°C; water spray cooling, coiling temperature 720°C;

[0041] 3) Cold rolling, continuous annealing, leveling: the cold rolling process controls the total reduction rate to 82%; then the obtained cold rolled sheet is continuously annealed, the soaking temperature is contro...

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Abstract

The invention discloses a pre-phosphated electrogalvanized automobile outer panel with a friendly coating. The pre-phosphated electrogalvanized automobile outer panel is characterized by being formedby performing electrogalvanizing treatment and pre-phosphating treatment on the surface of an Nb-containing ultra-low carbon steel panel; the Nb-containing ultra-low carbon steel panel comprises the following chemical components in percentage by mass: less than or equal to 0.0012% of C, less than or equal to 0.010% of Si, 0.08-0.18% of Mn, less than or equal to 0.010% of P, less than or equal to 0.008% of S, 0.02-0.04% of Nb, 0.02-0.05% of Als, less than or equal to 0.003% of N, and the balance Fe and inevitable impurities; and the content of nickel and the content of manganese in a phosphating film obtained through pre-phosphating are 0.7-1.5% and 3-8% respectively. The pre-phosphated electrogalvanized automobile outer panel can show good coating performance on the premise of ensuring good application performance such as stretching and stamping, and a manufacturing method is simple and suitable for being used and popularized.

Description

technical field [0001] The invention belongs to the technical field of steel manufacture and surface treatment, and in particular relates to a paint-friendly pre-phosphating electrogalvanized automobile outer panel and a preparation method thereof. Background technique [0002] In the production process of auto parts, coating is a very important link. The surface of many galvanized steel sheets has poor compatibility with the coating process of automobile factories, and problems such as poor electrophoresis occur. Considering the automobile coating process, the binding force between the galvanized layer and the steel plate is better than that with the organic film, so pre-phosphating treatment is usually performed after electro-galvanizing to improve the coating performance of the product. The ternary low-zinc phosphating treatment containing Mn and Ni ions can form a dense and uniform phosphating film; but the existing phosphating products have coarse surface crystals, unev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C22C38/06C22C38/04C22C38/02C21D8/02C21D1/26C25D3/22C23C22/80C23C22/76C23C22/18
CPCC21D1/26C21D8/0205C21D8/0247C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12C23C22/184C23C22/76C23C22/80C25D3/22
Inventor 冯冠文蔡捷黄道兵田伟江鹤群王安辉
Owner 武汉钢铁有限公司
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