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A kind of universal qpq nitriding agent concentration adjustment method

A technology of concentration adjustment and nitriding agent, which is applied in the direction of instruments, solid-state diffusion coatings, coatings, etc., can solve the problems of affecting production efficiency, long time consumption, and large impact on accuracy, and achieve the effect of saving labor costs and improving efficiency

Active Publication Date: 2021-11-19
江苏奕华新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method takes a long time and seriously affects production efficiency.
And the surveyors need to have a high technical level, sense of responsibility and patience, and the accuracy is greatly affected by the subjective factors of the surveyors

Method used

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  • A kind of universal qpq nitriding agent concentration adjustment method

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Effect test

Embodiment 1

[0024] Such as figure 1 A kind of general type QPQ nitriding agent concentration adjustment method shown, described method comprises the following steps:

[0025] S1 preparation of standard steel samples;

[0026] S2 Weigh the standard steel sample, nitriding the steel sample by standard process, and measure the cyanate content of the nitriding agent;

[0027] S3 weighs the standard steel sample after nitriding, and calculates the weight gain per unit area of ​​the steel sample before and after nitriding;

[0028] S4 Make a table according to the obtained cyanate value and the weight gain data per unit area of ​​the sample to cooperate with the production;

[0029] S5 uses the weight gain before and after nitriding of the standard steel sample standard process to query the table to calculate the cyanate content data and the amount of regeneration salt that should be added to achieve the purpose of adjusting the nitriding agent bath.

[0030] This embodiment can easily, quic...

Embodiment 2

[0032] This embodiment discloses a general nitriding agent concentration adjustment method, specifically as follows:

[0033] 1) Prepare a batch of 45 steel samples, the surface roughness is Ra0.2, the surface texture state is quenched and tempered state, and the sample size is 30mm×20mm×5mm. (The 45 steel sample can be replaced by any nitriding sample, and the size can be changed according to the situation, but the same size should be guaranteed)

[0034] 2) For a specific nitriding agent, use the chemical analysis method to measure the cyanate content. At the same time, put three samples in the nitriding agent, and nitriding at 570°C for 2 hours. Weigh with a professional electronic balance, calculate the weight gain per unit area of ​​each sample after nitriding, and take the average value.

[0035] 3) Repeat step 2 continuously to obtain the weight gain per unit area of ​​the 45 steel sample corresponding to different cyanate content.

[0036] 4) Form the obtained cyanat...

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Abstract

The invention relates to the technical field of chemical heat treatment, in particular to a method for adjusting the concentration of a general-purpose QPQ nitriding agent. The invention makes a table for the nitriding agent of a specific formula by measuring the weight gain per unit area of ​​the standard sample before and after nitriding in the standard process, and the cyanate value of the nitriding agent. In production, it is only necessary to measure the weight gain of the standard sample before and after nitriding in the standard process, and look up the table to calculate the cyanate content data and the amount of regeneration salt that should be added to achieve the purpose of adjusting the concentration of the nitriding agent. The present invention can obtain the cyanate content in real time. After obtaining the nitriding agent table of a specific formula, the personnel required for chemical analysis can be saved, and the test personnel will not be subject to subjective influence. For each measurement, at least one hour of measurement time can be saved, which can greatly improve efficiency; the nitriding sample measured by the weight gain method can continue to carry out weight detection in the subsequent oxidation process, and evaluate the porosity and Oxidation capacity of oxidized salts.

Description

technical field [0001] The invention relates to the technical field of chemical heat treatment, in particular to a method for adjusting the concentration of a general-purpose QPQ nitriding agent. Background technique [0002] QPQ nitriding belongs to the category of chemical heat treatment. It mainly refers to putting iron-based parts in a nitriding agent at a certain temperature, and infiltrating nitrogen atoms on the surface of the parts to form a compound layer and a diffusion layer, so that the surface of the parts has high hardness and high wear resistance. High corrosion resistance performance. When nitriding is in progress, while the nitriding agent undergoes a chemical reaction to generate active nitrogen atoms, the chemical composition of the nitriding agent itself is constantly changing and needs to be adjusted continuously. At present, the adjustment method of nitriding agent is mainly to use chemical analysis method to measure cyanate content, carbonate content,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/50G01N5/00
Inventor 李远辉祝伟王梁李佳轩
Owner 江苏奕华新材料科技有限公司
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