Surface-nanocrystallization low-temperature aluminizing treatment method for steel products

A technology of aluminizing treatment and nanotechnology, which is applied in the field of surface engineering, can solve the problems of non-dense aluminized layer, high aluminized temperature, and long holding time, and achieve the effect of good combination, uniform distribution of elements, and improved surface properties

Inactive Publication Date: 2015-09-16
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the present invention, steel parts and grinding balls of different particle sizes and quantities are put into a vibrating mill for vibration grinding. The impact energy of grinding balls with different particle sizes on the surface of steel parts is different, and it is easy to realize nano-processing on the surface of steel parts; the ma

Method used

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  • Surface-nanocrystallization low-temperature aluminizing treatment method for steel products
  • Surface-nanocrystallization low-temperature aluminizing treatment method for steel products
  • Surface-nanocrystallization low-temperature aluminizing treatment method for steel products

Examples

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Embodiment 1

[0034] In this embodiment, 316L stainless steel is taken as an example, and the low-temperature aluminizing after the surface nano-treatment referred to in the present invention is carried out, and the steps are as follows:

[0035] 1. Ultrasonic cleaning: Add alcohol with a mass fraction of 75% in the ultrasonic cleaning pool, and the volume of alcohol added accounts for one-third of the volume of the entire cleaning pool; put the steel parts into the ultrasonic pool for cleaning for 30-60 minutes; use clean water after ultrasonic cleaning Rinse until the surface is shiny and forms a continuous water film;

[0036] 2. Drying and degreasing: Put the rinsed steel parts in a drying oven, set the temperature at 200°C-350°C and bake until the surface is dry and oil-free; then put the baked steel parts into a mass fraction of 20 % to 30% hydrochloric acid solution, soak for 5 to 10 minutes; rinse the steel parts soaked in hydrochloric acid with running water for 2 to 8 minutes, and...

Embodiment 2

[0044] Taking the 40Cr steel piece as an example, the low-temperature aluminizing of surface nano-heating referred to in the present invention is carried out. Aluminized component mass ratio: 20% Al powder (200 mesh), 5% aluminum iron powder (200 mesh), 4% lanthanum chloride, 1% ammonium chloride, and the remaining 70% is filler alumina powder (100 mesh ).

[0045] According to the method described in Example 1, carry out surface nano-heating and low-temperature aluminizing: wherein the steel part is subjected to mechanical grinding surface nano-processing for 6h, Figure 4 In order to treat the microstructure and morphology of the surface after 6 hours, steel parts, two 40Cr metallographic test samples and aluminizing agent are packed together, sealed with water glass mud, and after consolidation, aluminized at low temperature (700 ° C) in a box furnace. Keep warm for 6 hours, cool with the furnace, take out the steel parts and metallographic testing samples from the box and...

Embodiment 3

[0047] Embodiment 3: Take 40Cr steel as an example:

[0048] Aluminized components: 20% Al powder (200 mesh), 5% aluminum iron powder (200 mesh), 4% lanthanum chloride, 1% ammonium chloride, and the remaining 70% is filler alumina powder (100 mesh).

[0049] Use the method described in Example 1 to carry out surface nano-heating and low-temperature aluminizing, and analyze the oxidation resistance of steel parts after aluminizing. Samples (dimensions of Quantity: 20 pieces) after mechanical grinding and surface nano treatment for 6 hours, pack it together with aluminizing agent, seal it with water glass mud, and after solidification, aluminize at low temperature (650°C) in a box furnace, keep it warm for 4 hours, and cool with the furnace. Remove the sample from the box and clean the surface.

[0050] Put the aluminized sample and the untreated sample into alumina ceramic crucibles respectively, put them together in a drying oven, heat the drying oven, and set the temperatu...

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Abstract

The invention relates to a surface-nanocrystallization low-temperature aluminizing treatment method for steel products. According to the method, uniform nanocrystallines are obtained on the surface of a material substrate by virtue of mechanical grinding, and then the steel products are subjected to low-temperature aluminizing by virtue of a rare-earth-catalyzed solid aluminizing method, so as to form a high-performance aluminized layer; the steel products and grinding balls different in particle size and quantity are put into a vibration mill together and are subjected to vibration grinding, and the impact energies of the grinding balls of different particle sizes to the surfaces of the steel products are different, so that the surface nanocrystallization treatment of the steel products is easily realized; the problems in a traditional aluminizing process that the aluminizing temperature is high, the temperature preservation time is long, the obtained aluminized layer is not compact, and the use effect is poor are solved to some degree, and a workpiece produced by virtue of the method has relatively high temperature oxidation resistance and corrosion resistance; the obtained aluminized layer is relatively uniform and compact, an aluminide coating with a single-layer structure is well combined with the substrate, a microscopic crack is avoided, the middle of the aluminized layer is a relatively narrow transition region, and Fe and Al elements are uniformly distributed.

Description

1. Technical field: [0001] The invention relates to a nanometerized low-temperature aluminizing treatment method on the surface of a steel piece, which belongs to the field of surface engineering. 2. Background technology: [0002] Aluminizing is a surface heat treatment technology. A dense film with excellent properties such as high temperature oxidation resistance and acid and alkali corrosion resistance is formed on the surface of the substrate by physical or chemical methods. Aluminized steel is widely used in some pressure parts, high temperature Oxidizing environment and some environments containing sulfur or sulfide, such as petroleum, electric power, transportation, chemical industry, metallurgy and aerospace and other fields. [0003] Aluminizing is an atomic diffusion process, which is greatly affected by temperature. In order to obtain sufficient thickness of the infiltration layer and increase the infiltration rate, a high temperature is often required. Since th...

Claims

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Application Information

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IPC IPC(8): C23C10/50
Inventor 宋月鹏陈义祥刘自平徐保岩李江涛王征
Owner SHANDONG AGRICULTURAL UNIVERSITY
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