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Low-temperature and low-pressure ion nitriding method and device for stainless steel workpiece

A technology of ion nitriding, low temperature and low pressure, which is applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of poor corrosion resistance and achieve increased nitriding efficiency, high corrosion resistance, and increased The effect of ionization rate

Inactive Publication Date: 2013-09-18
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to overcome the disadvantages of poor corrosion resistance of stainless steel nitriding surface existing in the prior art, the present invention proposes a low-temperature and low-pressure ion nitriding method and device for stainless steel workpieces

Method used

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  • Low-temperature and low-pressure ion nitriding method and device for stainless steel workpiece
  • Low-temperature and low-pressure ion nitriding method and device for stainless steel workpiece
  • Low-temperature and low-pressure ion nitriding method and device for stainless steel workpiece

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Embodiment 1

[0035] This embodiment is a low-temperature and low-pressure ion nitriding method for stainless steel workpieces. The stainless steel to be processed is AISI420 martensitic stainless steel, with a size of Φ30×12 disc and Φ12×80 rotating bending fatigue round bar workpiece. The specific operation steps are:

[0036]Step 1. Pretreatment of the workpiece surface. The surface pretreatment of the workpiece includes mechanical pretreatment of the workpiece surface, degreasing and ultrasonic cleaning of the workpiece surface. The specific process is: sequentially use 240#, 400#, 800#, 1200# water abrasive paper to polish the workpiece until it is bright, remove the burrs and impurities on the surface of the workpiece, and reduce the surface roughness of the workpiece. Degrease the ground workpiece with an aqueous solution of a commercial alkaline degreaser. The degreasing time is 5 minutes, and the temperature is 40°C. Tap water was used to rinse the workpiece surface. The ultras...

Embodiment 2

[0043] This embodiment is a low-temperature and low-pressure ion nitriding method for stainless steel workpieces. The stainless steel to be processed is 17-4PH martensitic stainless steel, with a size of Φ30×12 discs and Φ12×80 rotating bending fatigue round rod workpieces. The specific operation steps are:

[0044] Step 1. Pretreatment of the workpiece surface. The surface pretreatment of the workpiece includes mechanical pretreatment of the workpiece surface, degreasing and ultrasonic cleaning of the workpiece surface. The specific process is: sequentially use 240#, 400#, 800#, 1200# water abrasive paper to polish the workpiece until it is bright, remove the burrs and impurities on the surface of the workpiece, and reduce the surface roughness of the workpiece. When removing oil, first carry out alkali cleaning on the polished workpiece. Degrease the ground workpiece with an aqueous solution of a commercial alkaline degreaser. The degreasing time is 5 minutes, and the tem...

Embodiment 3

[0050] This embodiment is a low-temperature and low-pressure ion nitriding method for stainless steel workpieces. The stainless steel to be processed is AISI420 martensitic stainless steel, with a size of Φ30×12 disc and Φ12×80 rotating bending fatigue round bar workpiece. The specific operation steps are:

[0051] Step 1. Pretreatment of the workpiece surface. The surface pretreatment of the workpiece includes mechanical pretreatment of the workpiece surface, degreasing and ultrasonic cleaning of the workpiece surface. The specific process is: sequentially use 240#, 400#, 800#, 1200# water abrasive paper to polish the workpiece until it is bright, remove the burrs and impurities on the surface of the workpiece, and reduce the surface roughness of the workpiece. When removing oil, first carry out alkali cleaning on the polished workpiece. Degrease the ground workpiece with an aqueous solution of a commercial alkaline degreaser. The degreasing time is 5 minutes, and the temp...

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Abstract

The invention discloses a low-temperature and low-pressure ion nitriding method and a low-temperature and low-pressure ion nitriding device for a stainless steel workpiece. A nitriding vacuum chamber of the low-temperature and low-pressure ion nitriding device for the stainless steel workpiece can be vacuumized to keep constant air pressure; nitrided stainless steel can be placed on a sample platform; a negative electrode of a pulse power supply is connected with the sample platform; a negative electrode of a direct current power supply is connected with an auxiliary cathode titanium plate; the auxiliary cathode titanium plate is suspended in the nitriding vacuum chamber through an insulating ceramic suspension rod; the nitrided stainless steel is placed on the sample platform; and an appropriate distance is formed between the auxiliary cathode titanium plate and the nitrided stainless steel. In the nitriding process, the stainless steel workpiece subjected to low-temperature and low-pressure ion nitriding is obtained by controlling process parameters. According to the method and the device, the corrosion resistance, abrasion resistance and fatigue resistance of stainless steel are improved, and the nitriding surface of the obtained stainless steel workpiece is clean and bright.

Description

technical field [0001] The invention belongs to the technical field of stainless steel surface protection, in particular to a method for preparing a nitriding layer with high comprehensive performance of stainless steel wear resistance, corrosion resistance and fatigue resistance. Background technique [0002] Ion nitriding is a chemical heat treatment method that infiltrates the surface of stainless steel workpieces with nitrogen atoms at high temperature to form a nitrided layer mainly composed of nitrides. The nitriding process generally consists of three basic processes: the generation of active nitrogen atoms, the surface absorption of active nitrogen atoms, and the thermal diffusion of active nitrogen atoms. Ion nitriding can improve the surface hardness, wear resistance and fatigue resistance of stainless steel workpieces, and the process is simple and the investment in equipment is low. It has been widely used in the production practice of the industrial field. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/38
Inventor 汤金刚刘道新唐长斌于首明张晓化杜东兴
Owner NORTHWESTERN POLYTECHNICAL UNIV
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