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Surface active accelerant agent and method for catalytic nitriding by using same

A technology of surface activation and infiltration agent, applied in coating, metal material coating process, solid-state diffusion coating, etc., can solve the problem of gas and drip tube Louis crystal blockage, difficulty in nitriding process control, and uniformity of infiltration and poor reproducibility, etc., to achieve a significant effect of nitriding and catalytic infiltration, improve operability, and achieve good uniformity

Active Publication Date: 2011-02-16
CSIC NO 12 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a surface-activated osmotic agent to solve the problems of gas and Louis crystallization blockage in drip pipes, difficulty in controlling the nitriding process, and poor uniformity and reproducibility of osmosis in the existing rare earth osmosis technology.

Method used

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  • Surface active accelerant agent and method for catalytic nitriding by using same
  • Surface active accelerant agent and method for catalytic nitriding by using same
  • Surface active accelerant agent and method for catalytic nitriding by using same

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Immerse the parts in an aqueous solution of 3% metal cleaning agent by mass, and perform manual cleaning or ultrasonic cleaning for 5 minutes, and the frequency of ultrasonic cleaning is 20kHz. Prepare the surface activation penetrating agent, take 50 grams of H 3 PO 4 , 8 g NaNO 2 , 8 g urea, 8 g NaH 2 PO 4 , 2 grams of glycerol, 2 grams of sodium benzoate and the remainder being water. Get the pure aqueous solution that will prepare 1 / 2 of the total amount of surface-activated penetrating agent, mix H 3 PO 4 Slowly add to the aqueous solution, and keep stirring slowly; then add NaNO 2 , urea, NaH 2 PO 4, glycerin, sodium benzoate, stirring continuously during the adding process; finally add purified water to the total amount of surface-activated penetrating agent to be prepared, and stir evenly. Immerse the part in the osmotic agent activated at 60°C, start the ultrasonic switch, and keep the ultrasonic frequency at 40kHz for 5min. Take out the parts and rin...

Embodiment 2

[0042] Immerse the parts in an aqueous solution of 4% metal cleaning agent by mass, and perform manual cleaning or ultrasonic cleaning for 10 minutes at room temperature, and the frequency of ultrasonic cleaning is 80kHz. Preparation of surface activated penetrating agent, get 150 grams of H 3 PO 4 , 4 g NaNO 2 , 4 g urea, 4 g NaH 2 PO 4 , 2 grams of glycerin, 2 grams of sodium benzoate, and the balance is water. Get the pure aqueous solution that will prepare 1 / 2 of the total amount of surface-activated penetrating agent, mix H 3 PO 4 Slowly add to the aqueous solution, and keep stirring slowly; then add NaNO 2 , urea, NaH 2 PO 4 , glycerin, sodium benzoate, stirring continuously during the adding process; finally add purified water to the total amount of surface-activated penetrating agent to be prepared, and stir evenly. Immerse the part in the osmotic agent activated at 45°C, start the ultrasonic switch, and keep the ultrasonic frequency at 80kHz for 15 minutes. ...

Embodiment 3

[0044] Immerse the parts in an aqueous solution of 5% metal cleaning agent by mass, and perform manual cleaning or ultrasonic cleaning at 60°C for 30 minutes, and the ultrasonic cleaning frequency is 130kHz. Preparation of surface activated penetrating agent, get 300 grams of H 3 PO 4 , 2 g NaNO 2 , 2 g urea, 2 g NaH 2 PO 4 , 1 gram of glycerin, 1 gram of sodium benzoate, and the balance is water. Get the pure aqueous solution that will prepare 1 / 2 of the total amount of surface-activated penetrating agent, mix H 3 PO 4 Slowly add to the aqueous solution, and keep stirring slowly; then add NaNO 2 , urea, NaH 2 PO 4 , glycerin, sodium benzoate, stirring continuously during the adding process; finally add purified water to the total amount of surface-activated penetrating agent to be prepared, and stir evenly. Immerse the parts in the osmotic agent activated at 15°C for 10 minutes. Take out the parts and rinse them with clean water, then hang them into the furnace for ...

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Abstract

The invention discloses a surface active accelerant agent, composed of 3-30% of H3PO4, 0.2-1% of NaNO2, 0.2-1% of carbamide, 0.2-1% of NaH2PO4, 0.1-0.5% of glycerin, 0.1-0.5% of sodium benzoate, and the balance of water by mass percentage. The invention also discloses a method for catalytic nitriding by using the surface active accelerant agent, wherein, oil removing and washing are carried out firstly, then the surface active accelerant agent is prepared, and then accelerant pretreatment is carried out, and finally flushing and furnace entering are carried out. The surface active accelerant agent and the method for catalytic nitriding of the invention have the advantages that nitriding process is easy to control; accelerant uniformity and reproducibility are good and the surface active accelerant agent can be repeatedly used.

Description

technical field [0001] The invention belongs to the technical field of surface engineering, and relates to a surface activated osmotic agent. The invention also relates to using the surface activated osmotic agent for immersion outside a furnace, surface activated nitriding catalyzed infiltration or ultrasonic assisted immersion outside a furnace, surface activated nitridated catalyzed infiltration The method is suitable for gas nitriding and gas N-C co-infiltration of low carbon steel, low carbon alloy steel and ductile iron. Background technique [0002] At present, the commonly used nitriding infiltration method is to use rare earth solid or liquid infiltration agent. Under the same chemical heat treatment conditions, when the atmosphere contains rare earth elements, it can accelerate the decomposition of the medium and facilitate the gas phase activation; the rare earth elements are deposited on the steel parts. Surface, cleaning and activating the surface of steel parts...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/30C23C8/32C23C8/26C23C8/02
Inventor 王佐平孙长涛马中伟张镜斌陈分宏苏宏义
Owner CSIC NO 12 RES INST
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