Steel part with corrosion-resistant impregnating layer

A technology of steel parts and infiltration layer, which is applied in the direction of coating, solid diffusion coating, metal material coating technology, etc., can solve the problems that affect the performance of stainless steel products, the protective coating and the stainless steel substrate are easy to crack and volatilize, and achieve The surface performance is stable, preventing further penetration and improving the binding force

Inactive Publication Date: 2018-02-27
铜山县利国钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in vacuum sintering, the anti-rust Cr element in stainless steel will volatilize, thus affecting the performance of stainless steel products
Therefore, it can be considered to apply a protective coating on the surface of stainless steel to increase its corrosion resistance. However, practice has proved that the protective coating and the stainless steel substrate are easily detached, so how to improve the corrosion resistance of the stainless steel surface is a top priority.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] A method for surface treatment of stainless steel, comprising the steps of:

[0011] (1) A steel sample with a size of 15*15*10mm was taken as the substrate, and aluminum nitride AlN was selected as the source material;

[0012] (2) The steel sample was polished with sandpaper for multiple passes, and then mechanically polished with 0.5 μm diamond spray polishing agent, then ultrasonically cleaned in acetone, alcohol, and deionized water for 10 minutes, dried, and packaged for use;

[0013] (3) Carry out aluminizing treatment with a double-layer glow plasma metallizing vacuum furnace, use a stainless steel cylinder as an auxiliary cathode, and place the substrate and aluminum nitride AlN in the auxiliary cathode;

[0014] (4) Start surface treatment: process parameters are frequency 55Hz, pole spacing 15mm, holding temperature 800°C, holding time 2h, source voltage 400V, cathode voltage 300V, after treatment the sample is cooled to room temperature with the furnace.

...

Embodiment 2

[0021] A method for surface treatment of stainless steel, comprising the steps of:

[0022] (1) A steel sample with a size of 15*15*10mm was taken as the substrate, and aluminum nitride AlN was selected as the source material;

[0023] (2) The steel sample was polished with sandpaper for multiple passes, and then mechanically polished with 0.5 μm diamond spray polishing agent, then ultrasonically cleaned in acetone, alcohol, and deionized water for 10 minutes, dried, and packaged for use;

[0024] (3) Carry out aluminizing treatment with a double-layer glow plasma metallizing vacuum furnace, use a stainless steel cylinder as an auxiliary cathode, and place the substrate and aluminum nitride AlN in the auxiliary cathode;

[0025] (4) Start surface treatment: process parameters are frequency 60Hz, pole spacing 10mm, holding temperature 900°C, holding time 3h, source voltage 400V, cathode voltage 400V, after treatment the sample is cooled to room temperature with the furnace.

...

Embodiment 3

[0028] A method for surface treatment of stainless steel, comprising the steps of:

[0029] (1) A steel sample with a size of 15*15*10mm was taken as the substrate, and aluminum nitride AlN was selected as the source material;

[0030] (2) The steel sample was polished with sandpaper for multiple passes, and then mechanically polished with 0.5 μm diamond spray polishing agent, then ultrasonically cleaned in acetone, alcohol, and deionized water for 10 minutes, dried, and packaged for use;

[0031] (3) Carry out aluminizing treatment with a double-layer glow plasma metallizing vacuum furnace, use a stainless steel cylinder as an auxiliary cathode, and place the substrate and aluminum nitride AlN in the auxiliary cathode;

[0032] (4) Start surface treatment: process parameters are frequency 55Hz, pole spacing 15mm, holding temperature 800°C, holding time 2h, source voltage 600V, cathode voltage 400V, after treatment the sample is cooled to room temperature with the furnace.

...

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Abstract

The invention discloses a steel part with a corrosion-resistant impregnating layer. 304 stainless steel serves as a base material. The surface of the base material is coated with a corrosion-resistantlayer. The thickness of the corrosion-resistant layer is 50-80 microns. The corrosion-resistant layer comprises, by weight, 20-30% of NiAl and 70-80% of Ni3Al. The quality of the corrosion-resistantimpregnating layer is good. AlN is adopted as a source electrode material can generate N2 during the reaction to play a role of shielding gas and prevent other oxidizing reactions. It is guaranteed that the surface layer of steel has higher cleanliness. The surface of the steel part mainly comprises NiAl and Ni3Al. The bonding force between the impregnating layer and a base body is increased. A complete and compact corrosion-resistant AlO surface layer can be formed on the surface of the stainless steel over time. Accordingly, the steel part can effectively resist corrosion.

Description

technical field [0001] The invention relates to a steel piece with an anti-corrosion layer, which belongs to the field of metal processing. Background technique [0002] Due to its excellent performance, stainless steel has been widely used in all aspects of production and life. Finished stainless steel can be obtained in a number of ways. In powder metallurgy, stainless steel powder is densified by high-temperature sintering to obtain products, among which vacuum sintering is a very common method. However, in vacuum sintering, the anti-rust Cr element in stainless steel will volatilize, thereby affecting the performance of stainless steel products. Therefore, it can be considered to apply a protective coating on the surface of stainless steel to increase its corrosion resistance. However, practice has proved that the protective coating and the stainless steel substrate are easily detached, so how to improve the corrosion resistance of the stainless steel surface is a top ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/14
CPCC23C10/14
Inventor 齐正银郑庆海杨斌么高永
Owner 铜山县利国钢铁有限公司
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