A pre-treatment method for hot-dip aluminizing of uncoated ultra-high-strength steel plates for vehicles

An ultra-high-strength, hot-dip aluminum technology, applied in hot-dip plating process, coating, metal material coating process, etc., can solve the problems of steel plate surface oxidation, reduce the service life of molds, missing plating, etc., and achieve simple operation, Low scrap rate and improved corrosion resistance

Active Publication Date: 2018-08-14
NANJING INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When using uncoated ultra-high-strength steel sheets to manufacture vehicle components, there are the following problems: (1) When using the direct hot stamping technology path of uncoated ultra-high-strength steel sheets, in the austenitization process heated to 880-940°C, due to If the heating temperature is high, the surface of the steel plate will be severely oxidized. On the one hand, the scale that peels off during hot stamping will reduce the service life of the mold; on the other hand, in order to remove the scale before coating, it is necessary to sandblast or shot peening
(2) When the uncoated ultra-high strength steel plate is hot dipped in aluminum and then hot stamped, the same effect as that of the imported coated steel plate can be obtained. Oil and pickling effects often lead to partial missing plating due to poor pre-treatment during hot-dip aluminum, which in turn affects the yield and quality of hot stamping formed components

Method used

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  • A pre-treatment method for hot-dip aluminizing of uncoated ultra-high-strength steel plates for vehicles
  • A pre-treatment method for hot-dip aluminizing of uncoated ultra-high-strength steel plates for vehicles
  • A pre-treatment method for hot-dip aluminizing of uncoated ultra-high-strength steel plates for vehicles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A pretreatment method for hot-dip aluminum of an uncoated ultra-high-strength steel plate for vehicles, using an ultra-high-strength steel plate, that is, a cold-rolled low-carbon manganese-boron steel plate as the base material of the embodiment, and the size is Φ25×2mm.

[0025] (1) Take 1L of water, add 15g NaOH, 25g Na 2 CO 3 , 8g Na 3 PO 4 and 3g Na 2 SiO 3 Dubbed alkaline degreasing fluid. First, heat the alkaline degreasing solution to 85°C, hang the low-carbon manganese-boron steel plate in the alkaline degreasing solution for 30 minutes, remove the oil on the surface of the steel plate, and then wash it with water.

[0026] (2) Take 2mL of hydrochloric acid, 0.3g of citric acid, 0.15g of copper chloride and 98mL of water to make a pickling copper plating solution. Soak the steel plate treated in step (1) in the pickling copper plating solution for 10 minutes; then wash it with water.

[0027] (3) Take 40g of zinc chloride, 10g of sodium fluoride, 0.5g of...

Embodiment 2

[0033] (1) Take 1L of water, add 25g NaOH, 35g Na 2 CO 3 , 12g Na 3 PO 4 and 7g Na 2 SiO 3 Dubbed alkaline degreasing fluid. First, heat the alkaline degreasing solution to 90°C, hang the low-carbon manganese-boron steel plate in the alkaline degreasing solution for 60 minutes, remove the oil on the surface of the steel plate, and then wash it with water.

[0034] (2) Take 5mL of hydrochloric acid, 0.5g of citric acid, 0.3g of copper chloride and 95mL of water to make a pickling copper plating solution. Soak the steel plate treated in step (1) in the pickling copper plating solution for 20 minutes; then wash it with water.

[0035] (3) Take 40g of zinc chloride, 10g of sodium fluoride, 0.5g of copper sulfate and 50g of water to make a copper ion-containing flux. Immerse the steel plate sample treated by the above steps in the flux containing copper ions for 5 minutes, and finally dry it.

[0036] as attached Figure 4 As shown, the observation of the surface morpholog...

Embodiment 3

[0038] (1) Take 1L of water, add 20g NaOH, 30g Na 2 CO 3 , 10g Na 3 PO 4 and 5g Na 2 SiO 3 Dubbed alkaline degreasing fluid. First, heat the alkaline degreasing solution to 90°C, hang the low-carbon manganese-boron steel plate in the alkaline degreasing solution for 45 minutes, remove the oil stain on the surface of the steel plate, and then wash it with water.

[0039] (2) Take 4mL of hydrochloric acid, 0.4g of citric acid, 0.36g of copper sulfate and 96mL of water to make a pickling copper plating solution. Soak the steel plate treated in step (1) in the pickling copper plating solution for 15 minutes; then wash it with water.

[0040] (3) Take 40g of zinc chloride, 10g of sodium fluoride, 0.5g of copper chloride and 50g of water to make a copper ion-containing flux. Immerse the steel plate sample treated by the above steps in the copper ion-containing flux for 3 minutes, and finally dry it.

[0041] (4) The hot-dip aluminum process experiment was carried out on the ...

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Abstract

The invention provides a hot dip aluminizing pretreatment method of a plating layer-free ultrahigh strength steel plate for vehicles. The pretreatment method comprises the steps of ultrahigh strength steel plate deoiling, water washing, pickling, copper plating, water washing, plating aiding treatment, and drying. The pretreatment method allows a composite coating film composed of an internal layer copper film and an external layer plating aid to be formed on the surface of the ultrahigh strength steel plate of a hot stamping shaped part before hot dip aluminizing, solves the problem of local plating leakage of steel plates, and has the advantages of low defective index, no need of another pretreatment process, simple operation, and suitableness for industrial production.

Description

technical field [0001] The invention belongs to the technical field of metal material surface modification coatings, and in particular relates to a pretreatment method for hot-dip aluminum of an uncoated ultra-high-strength steel plate for vehicles. Background technique [0002] Common means of transportation such as automobiles, subways and high-speed rail vehicles, etc., the body occupies a relatively high proportion of the vehicle mass. For example, the body weight of a car accounts for about 25% of the car's own weight. Therefore, the effective weight reduction of the body is one of the key links in the lightweight of the vehicle. one. The replacement of steel materials by lightweight materials and the replacement of ordinary steel by ultra-high-strength steel to reduce the wall thickness of vehicle components are two important technical paths to achieve lightweight vehicles in recent years. [0003] As far as cars are concerned, studies have shown that using ultra-high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/02C23C2/40C23C2/12
CPCC23C2/02C23C2/12C23C2/40
Inventor 王章忠方信贤王红星巴志新张保森
Owner NANJING INST OF TECH
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