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Locally reinforced hot-rolled zinc-aluminum plated steel plate and manufacturing method thereof

A local strengthening, galvanized aluminum technology, applied in chemical instruments and methods, pressure inorganic powder coating, layered products, etc., can solve the problem of increasing the complexity of the coating process and unable to realize the preparation of hot-rolled sheet zinc-aluminum alloy coatings and other problems, to avoid the formation of excessive brittle phases at the interface, improve the coordination deformation ability, and achieve the effect of high efficiency

Active Publication Date: 2015-09-30
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the above-mentioned technologies, there are generally high requirements for the original plate, and the preparation of the zinc-aluminum alloy coating on the surface of the hot-rolled plate cannot be realized.
As we all know, the interface treatment between the coating and the substrate is the weakest link in the coating technology. In the above-mentioned technologies, the interface is mainly used to prepare the transition metal layer or the method of mechanical over-roughening to improve the adhesion between the coating and the substrate. The preparation of the transition layer Increases the complexity of the coating process

Method used

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  • Locally reinforced hot-rolled zinc-aluminum plated steel plate and manufacturing method thereof
  • Locally reinforced hot-rolled zinc-aluminum plated steel plate and manufacturing method thereof
  • Locally reinforced hot-rolled zinc-aluminum plated steel plate and manufacturing method thereof

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Experimental program
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Effect test

Embodiment 1

[0040] The substrate is hot-rolled IF steel with a thickness of 4mm. The substrate surface pretreatment adopts a gas-solid two-phase flow composed of compressed air and alumina balls to remove surface oxide scale by high-speed bombardment, and obtain a surface layer with a grain size of 30nm, a roughness of Ra1.2μm, a fine-grain layer thickness of 15μm, and a surface hardness of 2.1 GPa, the hardness of the core is 1.6GPa, the change trend of the hardness of the steel plate from the surface to the core is as follows image 3 As shown, the introduction of hardness difference on the surface improves the coordination between the deformation of the steel substrate and the coating. A 100μm zinc-aluminum alloy coating is deposited by cold spraying on the surface of the above-mentioned pretreated steel sheet. The cross-sectional appearance of the cold sprayed coating is as follows: Figure 4 As shown, the driving gas and carrier gas are industrial nitrogen, the pressure is 2.2MPa, the ...

Embodiment 2

[0042] The base plate is hot rolled Q235 steel with a thickness of 2mm. The substrate surface pretreatment adopts a gas-solid two-phase flow composed of compressed air and cast steel shots to remove surface oxide scale by high-speed bombardment, and obtain a surface layer with a grain size of 27nm, a roughness of Ra2.0μm, a fine grain layer thickness of 25μm, and a surface hardness of 2.5 GPa, heart hardness 1.8GPa. A 200μm zinc-aluminum alloy coating is deposited by cold spraying on the surface of the pretreated steel sheet. The driving gas and carrier gas are industrial nitrogen, the pressure is 2.5MPa, and the particle size range of the powder raw materials used is 15-50μm, the ratio is 52%, and the ratio is 50-80μm. 28%, the remaining particles are 80-100μm, and the powder feeding rate is 290g / min. Heat treatment of the above-mentioned galvanized aluminum Q235 steel plate, the environment is hydrogen reduction atmosphere, the heat treatment temperature is 450℃, the holding...

Embodiment 3

[0044] The base plate is hot rolled Q345 steel with a thickness of 10mm. The substrate surface pretreatment adopts a gas-solid two-phase flow composed of compressed air and stainless steel wire cut pellets, and high-speed bombardment to remove the surface oxide scale. The surface grain size is 0.95μm, the roughness is Ra1.8μm, and the fine grain layer thickness is 50μm. The hardness is 2.8GPa, and the core hardness is 2.0GPa. A 50μm zinc-aluminum alloy coating is deposited by cold spraying on the surface of the above pretreated steel sheet, the driving gas and carrier gas are industrial nitrogen, the pressure is 0.8MPa, and the particle size range of the powder raw materials used is 15-50μm, the ratio is 63%, and the ratio is 50-80μm. 24%, the remaining particles are 80-100μm, and the powder feeding rate is 55g / min. The above-mentioned galvanized aluminum Q345 steel plate is heat treated, the environment is hydrogen reduction atmosphere, the heat treatment temperature is 390℃,...

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Abstract

The invention discloses a locally reinforced hot-rolled aluminum-zinc plated steel plate and a manufacturing method thereof. The locally reinforced hot-rolled aluminum-zinc plated steel plate comprises a matrix and a plating, wherein the interface between the plating and the matrix of the zinc-aluminum plated steel plate comprises a non-continuously distributed and locally diffused reinforced zone composed of an iron-zinc compound and an iron-aluminum compound. Compared with a normal hot-dipping zinc plated or zinc-aluminum plated plate, by controlling the formation and distribution of the metal compounds in the interface, the local interface reinforced zone is formed and has relative good adhesion strength and forming performance. The manufacturing method comprises the steps of pre-treatment of the hot-rolled steel plate, cold spraying of zinc-aluminum and post thermal treatment. By adopting the method, the effects of acidless descaling as well as fining and roughening of surface grains are synchronously realized; the method is high in efficiency, slight in pollution and environment-friendly; the plating is strong in adaptability and wide in product range.

Description

Technical field [0001] The invention relates to the field of surface protection of steel plate products, in particular to a locally strengthened galvanized aluminum alloy hot-rolled strip and a manufacturing method thereof. Background technique [0002] Galvanizing or zinc alloy plating on the surface of steel products is one of the most commonly used and most effective protection methods. It is widely used in industry, especially in the automotive and home appliance industries. With the development of electric power, railway and military industries and the continuous improvement of surface protection performance, pure galvanized products can no longer meet the requirements in terms of corrosion resistance and mechanical properties. Galvalume (55% Al-43.4% zinc-1.6% Si ) And Galfan (zinc-5%Al0.1%RE) represented by hot-dip galvanized aluminum alloy has gradually become the main direction of the hot-dip galvanizing industry. Zinc-aluminum alloy coating combines the advantages of p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/01C23F17/00C23C24/04C21D8/02
Inventor 梁永立杨晓萍史弼张宇军张俊宝
Owner BAOSHAN IRON & STEEL CO LTD
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