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Preparation method of high-temperature wear-resistant coating on surface of steel piece

A high-temperature wear-resistant and wear-resistant coating technology, which is applied in coating, metal material coating process, hot-dip plating process, etc., can solve the problems of corrosion resistance and high-temperature oxidation resistance without high-temperature wear resistance, and achieve good Corrosion resistance and high temperature oxidation resistance, unlimited size, easy industrial production effect

Active Publication Date: 2014-03-12
东台市溱东科技发展有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the Fe-Al intermetallic compound coating obtained by the liquid immersion aluminum process in the past only has corrosion resistance and high temperature oxidation resistance but no high temperature wear resistance. In the present invention, the liquid immersion aluminum and composite Diffusion treatment obtains a high-temperature wear-resistant coating on the steel surface, which is resistant to oxidation and corrosion. This method has the advantages of energy saving, material saving, and simple process, and can be widely used for surface strengthening of high-temperature wear-resistant parts.

Method used

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  • Preparation method of high-temperature wear-resistant coating on surface of steel piece
  • Preparation method of high-temperature wear-resistant coating on surface of steel piece
  • Preparation method of high-temperature wear-resistant coating on surface of steel piece

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Effect test

Embodiment 1

[0019] The surface of 45 steel parts is pre-treated: after the surface is polished, it is degreased by 10wt% NaOH aqueous solution at 60°C for 10 minutes, and then washed with water; then it is derusted by 5wt% HCl aqueous solution at 40°C for 10 minutes, and then washed and air-dried; the steel piece is immersed in a temperature of 80°C 6wt%NaCl+4wt%KF (mass percent concentration) aqueous solution for 10min, then dry; place the pretreated steel piece in 720°C aluminum liquid for 10min, take it out and air cool to room temperature; First, it was kept at 850°C in vacuum for 5 hours; then at 400°C in air for 30 minutes; 3 Al intermetallic compound and 6wt% Al 2 o 3 Composite wear-resistant coating.

Embodiment 2

[0021] The surface of 20CrMnTi steel parts is pre-treated: after the surface is polished, it is degreased by 20wt% NaOH aqueous solution at 50°C for 10 minutes, and then washed with water; then it is derusted by 8wt% HCl aqueous solution at 50°C for 10 minutes, and then washed and air-dried; the steel piece is immersed in a temperature of 80 5wt%KCl+4wt%NaCl+1wt%Na at ℃ 3 AlF 6 Help plating in aqueous solution for 10 minutes, then dry; immerse in molten aluminum at 750°C for 5 minutes, take it out and cool to room temperature in air; under argon protection, diffuse at 1100°C for 2 hours; then heat in air at 500°C 25min to obtain a thickness of 360μm, containing 92wt% FeAl and Fe 3 Al intermetallic compound and 8wt% Al 2 o 3 Composite coating.

Embodiment 3

[0023] Pretreatment on the surface of H13 steel parts: after the surface is polished bright, degrease with 15wt% NaOH aqueous solution at 70°C for 8 minutes, wash with water; %KCl+3wt%NaCl+1wt%NaF aqueous solution for 10min, then dry; immerse in molten aluminum at 800°C for 1min, take it out and air cool to room temperature; under argon protection, 1000°C diffusion treatment for 1h; Then heated in air at 600°C for 20min to obtain a 210μm-thick, 90wt%FeAl and Fe 3 Al intermetallic compound and 10wt% Al 2 o 3 Composite coating.

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Abstract

The invention relates to the technical field of steel piece surface treatment, and in particular relates to a preparation method of a high-temperature wear-resistant coating on the surface of a steel piece. According to the preparation method, a composite coating of a Fe-Al intermetallic compound and a little Al2O3 is obtained through liquid dip aluminum plating and subsequent compound dispersion treatment. The process flow of the preparation method comprises pretreatment (alkali cleaning, acid pickling and assisted plating), dip aluminum plating and dispersion treatment, wherein the dip aluminum plating is carried out for 1-10 minutes in liquid aluminum at a temperature ranging from 720 DEG C to 800 DEG C; and compound dispersion annealing which is carried out in a protective atmosphere or in vacuum at a temperature ranging from 850 DEG C to 1100 DEG C for 1-5 hours, and in air at a temperature ranging from 400 DEG C to 600 DEG C for 20-30 minutes. The temperature and the time of the dispersion treatment are adjusted so that composite wear-resistant coatings containing the intermetallic compound and a little Al2O3 and are different in thickness can be obtained. The preparation method has the characteristics of simple and convenient process, low cost, high coating binding force, excellent high-temperature wear resistance and the like, and thus can be widely applied to surface strengthening of high-temperature wear resisting steel pieces.

Description

technical field [0001] The invention relates to the technical field of surface treatment of steel parts, in particular to a method for preparing a high-temperature wear-resistant coating on the surface of steel parts. Background technique [0002] Fe-Al intermetallic compound has a series of advantages such as good high temperature oxidation resistance, strong corrosion resistance and high specific strength. The Fe-Al intermetallic compound coating obtained by liquid immersion aluminum on steel parts is widely used for corrosion resistance and high temperature oxidation resistance. In the environment, such as the following patents: 200410020758.8 (a method for preparing iron-aluminum intermetallic compound coating on the surface of steel and heat treatment), 200810138019.7 (process method for hot-dip aluminizing of heavy-duty vehicle exhaust pipes), 200910017800.3 (a steel Radiator hot-dip aluminizing process), etc., but the Fe-Al intermetallic compound obtained by liquid im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/12C23C2/28C23C2/02
Inventor 陈康敏王树奇廖远禄张秋阳周银崔向红
Owner 东台市溱东科技发展有限公司
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