GB/T 5121.4-1996 Chemical analysis methods for copper and copper alloys - Determination of aluminum content

This standard specifies the determination method of carbon and sulfur content in copper and copper alloys. This standard is applicable to the determination of carbon and sulfur content in copper and copper alloys. Determination range: carbon 0.001 0% ~ 0.20%; sulfur 0.001 0% ~ 0.030%. GB/T 5121.4-1996 Chemical analysis method for copper and copper alloys Determination of aluminum content GB/T5121.4-1996 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Chemical analysis method for copper and copper alloys-Determination of carbon and sulfur content1Scope
This standard specifies the method for determination of carbon and sulfur content in copper and copper alloys. GB/T 5121.4--1996
Replaces GB5121.485
GB 5122. 11
GB 8002. 14
GB 8550. 18
GB 8550. 19: -87
This standard is applicable to the determination of carbon and sulfur content in copper and copper alloys. Determination range: carbon 0.0010%~0.20%; sulfur 0.0010%~0.030%.
2 Referenced standards
The following standards contain provisions that constitute the provisions of this standard by being referenced in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB1.4-88 Standardization work guidelines for the preparation of chemical analysis methods GB1167--78 General principles and general provisions for chemical analysis methods for metallurgical products GB/T14265--93 General principles for the analysis of hydrogen, oxygen, nitrogen, carbon and sulfur in metal materials 3 Method summary
The sample is melted by high-frequency induction heating under flux and oxygen flow, and carbon and sulfur generate carbon dioxide and sulfur dioxide respectively, which are loaded into the infrared detector. The carbon and sulfur contents are measured according to the changes in the absorption of infrared light energy of a specific wavelength by the measured gas. 4 Reagents
4.1 Oxygen (>99.5%).
4.2 Nitrogen (>99.5%). bZxz.net
4.3 Alkali asbestos.
4.4 Anhydrous magnesium perfluorate.
4.5 Platinum-coated silica gel.
4.6 Glass wool.
4.7 Cellulose.
4.8 Tungsten-tin type flux, about 800~400μm. 4.9 Porcelain crucible, Φ×h: 25mm×25mm. Before use, burn in a muffle furnace at 1200C for at least 4h to reduce and stabilize the blank. Cool to room temperature and store in a dry place for use. 4.10 Copper and copper alloy standard samples, with carbon content: 0.0015%~0.35%, sulfur content: 0.0015%~0.035%. 4.11 Anhydrous ethanol.
4.12 Acetone.
5 Instrument
High frequency heating infrared absorption instrument: with electronic AC voltage stabilizer. The instrument should be able to meet the following indicators: High frequency furnace power 1.0~2.5kW: State Technical Supervision Bureau approved 214 on November 4, 1996
Implementation on April 1, 1997
GB/T5121.4—1996
Frequency up to 6.0MHz; Detector sensitivity: 0.0001%. 6 Sample
6.1 Make the block, rod or sheet sample into a small block or chip sample of 0.5~1.0g. 6.2 The sample needs to be cleaned with acetone 1~2 times, dried with cold air, and put into a ground-mouth bottle for use. 7 Analysis steps
7.1 Sample
Weigh 0.4~～1.1g sample, accurate to 0.001g. Perform two independent measurements and take the average value. 7.2 Instrument preparation
Preheat the instrument for more than 4 hours, and check the instrument constant item until the instrument is in normal condition. 7.3 Instrument calibration
Before analysis, calibrate the instrument with suitable copper and copper alloy standard samples. The carbon and sulfur content should be close to or greater than the content of the sample to be analyzed. The calibration procedure is carried out according to the instrument manual. The amount of flux added should not be less than the sample amount. After calibration, calibrate with a standard sample with the same content as the sample to be tested. The result should be within the allowable error of the standard sample. Otherwise, recalibrate. 7.4 Blank value determination
Before determination, set the original stored blank value to zero. Repeat the determination several times until it stabilizes. 7.5 Determination
Put the sample (7.1) in the snail, and the flux (4.8) covers the sample. The following procedures are performed according to the instrument manual. 8 Expression of analysis results
The results of the carbon and sulfur percentages automatically given by the computer are expressed to two decimal places. If the carbon and sulfur contents are less than 0.10%, they shall be expressed to 3 decimal places; if they are less than 0.010%, they shall be expressed to 4 decimal places.
9 Allowable Difference
The difference between the analysis results of laboratories shall not be greater than the allowable difference listed in Table 1. Table 1
Carbon content
0. 001 0~0. 003 0
>0. 003 0~- 0. 010
>0.010~0. 050
>0.050~0. 10
>0. 10~0. 20
Allowable difference
Sulfur content
0. 001 0~ 0. 002 0
>0. 002 0 ~0. 005 0
>0. 005 0~0. 010
>0.010~0.020
>0. 020~~ 0. 030
Allowable difference
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