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Ultrasonic frequency induction heating technology based quick hot-dipping aluminizing technology

A technology of induction heating and hot infiltration, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of surface brittleness, lack of surface, high cost of aluminized steel parts, and achieve bending performance and stamping. Improved formability, improved thermal shock resistance and thermal fatigue resistance, reduced concentration and consumption

Inactive Publication Date: 2015-01-28
WUHAN TIANCONG CREATIVE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Aluminizing is one of the effective measures for steel protection. It can significantly improve the corrosion resistance and heat resistance of steel in strong corrosive media and oxidizing media. However, the traditional resistance heating diffusion aluminizing process has high temperature, long cycle and high cost. , low output, aluminized steel parts have defects such as surface brittleness, easy deformation, no pure aluminum layer on the surface, and short service life of heating equipment
Although my country has conducted research on rapid electric heating and high-frequency induction heating aluminizing in the 1980s, the experimental results show that the method of rapidly heating aluminized by current can significantly improve the mechanical properties and appearance quality of aluminized parts, but these studies are based on paste The premise of rapid aluminizing is mostly in the laboratory stage, and it has not been able to achieve scale, industrialization, and profitability, which also hinders the industrial application of rapid aluminizing technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A super-audio frequency induction heating rapid hot dip aluminizing process is as follows:

[0019] ① Degreasing: chemically degrease the steel parts, bake and degrease them at 400°C for 10 minutes, until the surface is clean and free of oil;

[0020] ② Pickling and rust removal: Take the degreased steel parts out of the heating furnace, immerse them in a mixed pickling solution containing 2% sulfuric acid, 15% hydrochloric acid, and the balance is water, and equipped with a current generating device. After 2~ Take out the steel parts after 3 minutes of quick pickling;

[0021] ③Water washing: wash the steel parts after derusting with high-pressure water for 1~2 times;

[0022] ④ Surface activation: Immediately immerse the rinsed steel piece in an activation solution containing 1.8% anhydrous sodium tetraborate, 2% sodium nitrite, 30% sodium hydroxide, and the balance is water for 30 seconds;

[0023] ⑤. Permeation aid: Take out the activated steel piece and immed...

Embodiment 2

[0027] A super-audio frequency induction heating rapid hot dip aluminizing process is as follows:

[0028] ①, Degreasing: Chemically degrease the steel parts, bake and degrease at 500°C for 5 minutes, until the surface is clean and free of oil;

[0029] ②. Rapid pickling and rust removal: take the degreased steel parts out of the heating furnace, immerse them in a mixed pickling solution containing 2% sulfuric acid, 15% hydrochloric acid, and the balance is water, and equipped with a current generating device. After 2 Remove the steel part after ~3 minutes of pickling;

[0030] ③Water washing: wash the steel parts after derusting with high-pressure water for 1~2 times;

[0031] ④ Surface activation: Immediately immerse the rinsed steel piece in an activation solution containing 1.8% anhydrous sodium tetraborate, 2% sodium nitrite, 30% sodium hydroxide, and the balance is water for 30 seconds;

[0032] ⑤ Permeation aid: Take out the activated steel piece and immediately i...

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Abstract

The invention provides an ultrasonic frequency induction heating technology based quick hot-dipping aluminizing technology. The technology comprises the following steps: oil removing, acid pickling for rust removal, washing, surface activation, auxiliary infiltration, drying, and ultrasonic frequency induction heating technology based quick aluminizing. The technology has the following advantages: concentration and consumption of a pickling solution are reduced, and a rust removal speed is greatly increased; the hot-dipping aluminizing temperature is low, and the aluminizing process is short; compared with a heating method of a traditional resistance aluminizing furnace, the induction heating method adopted enables the utilization rate of electrical energy to be improved over 20%, and enables the annual output to be increased over one time; compared with traditional diffuse type aluminizing steel material, the new aluminizing steel material prepared with the technology retains a pure aluminium layer and an iron-aluminium alloy layer under a columnar eutectic state, and has the effects of corrosion resistance, heat resistance, abrasion resistance and photo-thermal reflectivity; a fragility area on the surface is eliminated; bending performance and punch forming performance are greatly improved; resistance to heat shocks and resistance to thermal fatigue are improved over 10%.

Description

technical field [0001] The invention relates to the technical field of metal heat treatment, in particular to a super-audio frequency induction heating rapid hot dip aluminizing process. Background technique [0002] Aluminizing is one of the effective measures for steel protection. It can significantly improve the corrosion resistance and heat resistance of steel in strong corrosive media and oxidizing media. However, the traditional resistance heating diffusion aluminizing process has high temperature, long cycle and high cost. , Low output, aluminized steel parts have defects such as surface brittleness, easy deformation, no pure aluminum layer on the surface, and short service life of heating equipment. Although my country has conducted research on rapid electric heating and high-frequency induction heating aluminizing in the 1980s, the experimental results show that the method of rapidly heating aluminized by current can significantly improve the mechanical properties a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/20C23C10/02
CPCC23C10/22C23C10/02
Inventor 王丽春费新诚
Owner WUHAN TIANCONG CREATIVE TECH
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