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YS/T 600-2009 English PDF (YST600-2009)

YS/T 600-2009 English PDF (YST600-2009)

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YS/T 600-2009: Analysis method of hydrogen in liquid aluminum and aluminum alloys the method of the closed gas loop circulation

This Standard specifies the measurement principle, instrument requirements, test conditions, test procedures, and test report of the closed gas loop circulation method for measuring hydrogen content in liquid aluminum and aluminum alloys. This Standard applies to the determination of hydrogen content in liquid aluminum and aluminum alloys. 2 Measurement principle The closed gas loop circulation method uses a circulation system to promote the diffusion of hydrogen in the aluminum melt into a quantitative volume of inert gas, until the hydrogen partial pressure reaches equilibrium. It uses the thermal conductivity test principle to test the change in thermal conductivity of circulating gas due to hydrogen, and measure the partial pressure of hydrogen Pi. The calculation method of hydrogen content is as shown in formula (1): where: [H] - the hydrogen content, in cubic centimeter per 100 grams of aluminum (cm3/100 g Al); Pi - the hydrogen partial pressure, in kilopascal (kPa); K - the alloy correction coefficient, determined by referring to formula (2). The correction coefficient K of commonly used aluminum and aluminum alloys is shown in Table 1; S0 - the solubility of hydrogen in pure aluminum, which is a function of temperature, as shown in formula (3), in cubic centimeter per 100 grams of aluminum (cm3/100 g Al). YS/T 600-2009 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 5 of 8 where: Cu% - the percentage content of copper; Si% - the percentage content of silicon; Mg% - the percentage content of magnesium. where: T - the absolute temperature, in Kelvin (K). Table 1 No. Designation Correction coefficient YS/T 600-2009 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 6 of 8 Table 1 (continued) 3 Instrument requirements 3.1 Measurement principle: closed gas loop circulation method. 3.2 Measuring range: 0.01 cm3/100 g Al ~ 0.99 cm3/100 g Al. 3.3 Resolution: 0.001 cm3/100 g Al. 3.4 Accuracy: ???€0.02 cm3/100 g Al (when the alloy correction...
YS/T 600-2009
YS
NONFERROUS METAL INDUSTRY STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
ICS 77.040.99
H 12
Analysis method of hydrogen in liquid aluminium and
aluminium alloys
the method of the closed gas loop circulation
ISSUED ON: DECEMBER 04, 2009
IMPLEMENTED ON: JUNE 1, 2010
Issued by: Ministry of Industry and Information Technology of the PRC
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Measurement principle ... 4
3 Instrument requirements ... 6
4 Test conditions ... 7
5 Test procedures ... 7
6 Test report ... 8
Analysis method of hydrogen in liquid aluminium and
aluminium alloys
the method of the closed gas loop circulation
1 Scope
This Standard specifies the measurement principle, instrument requirements, test conditions, test procedures, and test report of the closed gas loop circulation method for measuring hydrogen content in liquid aluminum and aluminum alloys.
This Standard applies to the determination of hydrogen content in liquid aluminum and aluminum alloys.
2 Measurement principle
The closed gas loop circulation method uses a circulation system to promote the diffusion of hydrogen in the aluminum melt into a quantitative volume of inert gas, until the hydrogen partial pressure reaches equilibrium. It uses the thermal conductivity test principle to test the change in thermal conductivity of circulating gas due to hydrogen, and measure the partial pressure of hydrogen Pi. The calculation method of hydrogen content is as shown in formula (1):
where:
[H] - the hydrogen content, in cubic centimeter per 100 grams of aluminum (cm3/100 g Al);
Pi - the hydrogen partial pressure, in kilopascal (kPa);
K - the alloy correction coefficient, determined by referring to formula (2). The correction coefficient K of commonly used aluminum and aluminum alloys is shown in Table 1;
S0 - the solubility of hydrogen in pure aluminum, which is a function of temperature, as shown in formula (3), in cubic centimeter per 100 grams of aluminum (cm3/100 g Al).
3.5 Repeatability: relative standard deviation ??? 2.5 %.
3.6 Calibration error: ??? 5 %.
3.7 Directly display hydrogen content.
4 Test conditions
4.1 Environmental requirements: temperature 0 ??C ~ 50 ??C, no electromagnetic interference that affects the normal operation of the instrument, and no corrosive gases. 4.2 Carrier gas source: selected according to the requirements of the instrument. 4.3 Hydrogen measuring probe: selected according to the requirements of the instrument, and it will not pollute the aluminum melt being measured under the test conditions.
4.4 Temperature measurement probe: selected according to the requirements of the instrument, and it will not pollute the aluminum melt being measured under the test conditions.
5 Test procedures
5.1 Instrument calibration
5.1.1 The instrument shall be carefully inspected and tested before use. 5.1.2 The instrument shall be tested with hydrogen in nitrogen standard gas and meet the requirement of calibration error.
5.2 Instrument preheating
Before using the instrument, it shall be powered on and preheated for 10 minutes. 5.3 Probe preheating
The hydrogen measuring probe shall be fully preheated according to the requirements of the selected instrument before use.
5.4 Data measurement
When measuring hydrogen, the measurement shall be repeated multiple times. When the difference between two consecutive data does not exceed the requirements in Table 2, the measurement is completed. The temperature shall be measured simultaneously with each measurement.

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