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High temperature infiltration nitrogen treatment method of stainless steel sieve plate

A stainless steel sieve, stainless steel technology, applied in the direction of coating, metal material coating process, solid diffusion coating, etc., can solve the problems of corrosion and wear of sieve plate, and achieve the effect of prolonging service life, simple process and uniform thickness

Active Publication Date: 2018-01-23
SHANDONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the corrosion and wear problems of the sieve plate under harsh working conditions, the present invention provides a high-temperature infiltration nitrogen treatment method to improve the corrosion resistance of the stainless steel sieve plate. A high-temperature dissolved nitrogen layer of 1-2mm is obtained on the hole wall surface, and a nitrogen-containing martensite structure is obtained through the quenching process, which can significantly improve the wear resistance of the sieve plate surface and the hole wall without reducing the corrosion resistance

Method used

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Experimental program
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Effect test

Embodiment 1

[0031] Step 1: Surface Pretreatment

[0032] The surface of the stainless steel sieve plate is treated with a general electroless Ni plating pretreatment method, which is divided into two steps of cleaning and activation: first use alcohol or gasoline to completely remove the oil on the surface of the workpiece, and then pickle the surface to remove the oxide film on the surface of the workpiece, acid Washing temperature: 15-30°C, pickling time: 3-5min;

[0033] Step 2: Electroless Nickel Flash Plating

[0034] Immediately after pickling to remove the oxide film on the surface of the stainless steel sieve plate, immerse it in the flash nickel solution. When performing nickel flash plating, the stainless steel sieve plate should be pre-soaked in the plating tank for 10-15 minutes before being energized. After electrification, the plated parts stay in the plating tank for 3 minutes, and after nickel flash plating, they must be quickly put into the nitriding furnace after clean...

Embodiment 2

[0039] In addition to the second step of electrification, the plated parts stay in the plating tank for 5 minutes, and in the third step of high temperature dissolved nitrogen treatment, the dissolved nitrogen temperature is set to 1050 ° C, the pressure in the furnace is set to 2 bar, and the nitriding time is kept for 4 hours. Except for the parameter changes in the above two steps, all other processes and parameters are the same as in the first embodiment.

[0040] It has been tested: the martensite depth of the solid-dissolved nitrogen obtained in Example 2 reaches 1 mm, and the hardness can be increased by 1.3 times.

Embodiment 3

[0042] In addition to the second step of electrification, the plated parts stay in the plating tank for 4 minutes, and in the third step of high temperature dissolved nitrogen treatment, the dissolved nitrogen temperature is set to 1010 ° C, the pressure in the furnace is set to 1.5 bar, and the nitriding time is kept for 3 hours. Except for the parameter changes in the above two steps, all other processes and parameters are the same as in the first embodiment.

[0043] It has been tested: the martensite depth of solid-dissolved nitrogen finally obtained in Example 3 reaches 1.5 mm, and the hardness can be increased by 1.5 times.

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Abstract

The invention discloses a high-temperature infiltration nitrogen treatment method for a stainless steel sieve plate. By performing high-temperature infiltration nitrogen treatment on the stainless steel sieve plate, a high-temperature dissolved nitrogen layer of 1-2 mm is obtained on the wall surface of the sieve hole. The nitrogen-containing martensite or austenite layer is obtained on the surface of the plate and the wall of the hole. On the basis of maintaining the corrosion resistance of stainless steel, the technology of significantly improving the wear resistance of the surface of the sieve plate and the wall of the hole, thereby prolonging the service life of the stainless steel sieve plate .

Description

technical field [0001] The invention belongs to the field of materials, and relates to a method for improving the wear resistance of stainless steel sieve plates. Specifically, it uses high-temperature infiltration nitrogen treatment to obtain a high-temperature dissolved nitrogen layer of 1-2 mm on the wall surface of the sieve hole, and through a quenching process, The method of obtaining nitrogen-containing martensite or austenite is a technology that significantly improves the wear resistance of the surface of the sieve plate and the wall of the hole on the basis of maintaining the corrosion resistance of stainless steel. Background technique [0002] Stainless steel sieve plate has good corrosion resistance, it has high rigidity and bearing capacity, and can be made into rigid screening and filtering devices of various shapes, which are widely used in screening, filtering, dehydration, desliming, etc. in various industries effect. At present, the sieve plates used in c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/26C23C8/02C23C8/80C25D7/04
Inventor 崔洪芝王伟张国松宋强魏娜宋晓杰张新杰
Owner SHANDONG UNIV OF SCI & TECH
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