SU1453245A1 - Method of analyzing content of diffusion hydrogen in metals - Google Patents

Abstract

The invention relates to the study of the chemical and physical properties of substances, in particular; methods of determining the content of hydrogen in metals, and can be applied in metallurgy, mechanical engineering and electroplating. The purpose of the invention is to show the performance of the process. This continuously records the diffusion of hydrogen from the sample according to the thermal effect of the oxidation of hydrogen in an air stream at a temperature of 630-650 0, air velocity 0.25-5 m / s, and the residence time of hydrogen in the chamber 0.4-8.0 s. A sample of the sample is chosen with a content of 0.005-0.5 cm of hydrogen in it. I Il Table I but

Description

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The invention relates to the study of the chemical and physical properties of substances, in particular, to methods for determining the hydrogen content in metals and alloys, and can be used in metallurgy, mechanical engineering and electroplating.

The purpose of the invention is to increase the productivity of the process.

The drawing shows a diagram of the device for the implementation of the proposed method

In order to achieve this goal, hydrogen diffusion from a sample is continuously recorded according to the thermal effect of the oxidation of hydrogen in air at 630-650 ° C, the speed of movement of the air stream 0.25-5 m / s, the residence time of hydrogen in the chamber 0.4- 8 seconds and a sample of sample containing 0.005-0.5 cm of hydrogen,

The table shows the results of studies confirming the found mode of the process for determining the content of hydrogen NIN, at which the hydrogen in the chamber is practically not oxidized.

The indicated mode of carrying out the process of hydrogen extraction was obtained by studying the oxidation of hydrogen in a stream of air in various volumes of the furnace chamber.

The sample weight is determined by the formula

ТП ™ ТЧ

 Qr

where V is the volume of hydrogen, which when

certain conditions of extraction do not oxidize in the chamber, Q is the tabular value of the maximum hydrogen content of the metal under study, cm / 100. If the hydrogen content in the metal does not increase with time, then the next sample of the sample can be determined more accurately by the formula

Vfl-100

R1l

 about

ABOUT

where O is the hydrogen content corresponding to the previous sample, cmV100 g. 55 Example. It is known that the hydrogen content in metallurgical steel is 1-10 cm V100 ri Therefore, at, the speed of movement

air jets of 0.25–5 m / s and the residence time of hydrogen in the chamber of 0.4–8 s should be taken as follows:

Go, 0.04-5 g.

Calculate the weight of the second sample, if it turned out that the hydrogen content in the first sample is, for example, 2 cm / 100 g

25-25

During the extraction of hydrogen from the sample with an air stream, the concentration and time of hydrogen in the heating zone of the chamber, as well as the intensity of heat removal from the reaction zone with products leaving the chamber and the rate of removal of active centers from surfaces, are controlled. These factors determine the process of hydrogen oxidation.

At certain values of the process mode, the self-ignition temperature of hydrogen in air increases, therefore, the extraction of hydrogen is carried out at higher temperatures, at which the rate of hydrogen diffusion in the metal increases.

By carrying out continuous recording of hydrogen diffusion when the sample is heated, the end of degassing is precisely set and, thus, the analysis time is reduced.

A device for implementing the proposed method comprises a chamber 1 with crucible 2 for placing sample 3, a furnace 4, a cylinder 5 with compressed air, a chromatograph 6 with a recorder 7, an electronic integrator 8, a current source 9 and a measuring device 10. The heating temperature of sample 3 is controlled by thermocouple 11. Cylinder 5 using a three-way valve 1 2 and lines 13 and 14 is connected to chamber 1 and chromatograph 6, which is connected to chamber 1 by means of line 15, crane 16 and outlet pipes of chamber 1 equipped with shut-off valves 17 and 18 with thin sections 19 and 20. l eliminate traces of water chamber 21 1 is provided lovugakoy.

The method is implemented as follows.

Sample 3 at the place of production of metal in the crucible 2 is placed in the chamber 1. At the same time, the taps 17 and 18 are in the Closed position. Air from the ball 14532454

According to separately extracted magordon 5, as the temperature increases, 14 is supplied directly to the detector detector from 300–320 ° C to 630–650 ° C, the thermal effect of the oxidation reaction hydrogen extraction process accelerates hydrogen in the air, which is g c, because between the diffraction speed of the chromatograph 6. Hydrogen fusions are established and the temperature dependence of the determined volumetric rate differs. Conducting air and removing the zero line by continuously registering the diffusion of the automatic recording of hydrogen from the metal to accurately determine 7 of the chromatograph 6. Chamber I is transferred-10 to complete the end of degassing. This, together with the test installation, speeds up the process of determining the gassed sample for hydrogen content, holding the sample. placed in an oven 4 that feeds

From the current source 9 and with the help of the slit, the advantages of using the prefixes IV and 20 are connected to the gas-lagging method, consisting of more gistrals 13 and 15, while the valve 16 is in a position to quickly determine the contents of the diffuser. Closed, and zionic hydrogen in metals and melt-three-way valve 12 intersects wahs, provide an increase in production line. Edges 18, 17 are opened up by industrial processes and 1b, a three-way valve 12 switches the quality of products from a cylinder 5 with air from the magistrates, sent 14 to line 13 and includes

Claims (1)

electric oven 4. From the moment the pro formula of the invention is carried out by pumping through the air chamber 1 and heating the sample 3 water analysis 25 The method for determining the content of the genus is carried out continuously by thermal, fusional hydrogen in metals, including the oxidation reaction, which can be shifted sampling, placing the sample in the air. Hydrogen is recorded into the chamber, hydrogen is extracted from the recorder 7. The temperature of the sample is heated by heating the sample in the air bath of the thermocouple and the quantitative analysis of the hydrogen element 11, which is connected to the measuring device 10. . that, in order to ensure the rapid identification of the results of the process, continuously register-analysis integrates the diffusion of hydrogen from the sample of the peak area of the electron by the electronic 35 "thermal effect of the reaction ii oxidation integrator 8. The traces of water or dispose of hydrogen in the air stream heated .ruyuts lovuschkoy 21.tom to 630-650 C, and the rate of  - air flow is chosen within In the study of a number of samples of 0.25–5 m / s, the residence time of the water produced good convergence and reproduction in the chamber within 4–8 s and the repeatability of the analysis results. From a sample of samples is selected from the data on the measurement of water content in it 0.005-0.5 cm of hydrogen The mode of the method for determining the temperature, C 630 Movement speed air jets, m / s 0.25 Stay time hydrogen in the chamber с8,0 Volume of hydrogen entered into cameru, 500 51453245 Hydrogen Analysis Index Volume of hydrogen analyzed device, cm 0.496 0.048 0.005  / ,/five