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GB/T 24268-2009 English PDF

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GB/T 24268-2009: Test methods for chemical analysis of silver-tin oxide electric contact material
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Basic data

Standard ID GB/T 24268-2009 (GB/T24268-2009)
Description (Translated English) Test methods for chemical analysis of silver-tin oxide electric contact material
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard K14
Classification of International Standard 29.120.99
Word Count Estimation 13,174
Date of Issue 2009-06-19
Date of Implementation 2010-02-01
Regulation (derived from) Announcement of Newly Approved National Standards No. 9, 2009 (No. 149 overall)
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary This standard specifies the silver tin oxide or silver oxide, indium tin oxide electrical contact material silver, tin, nickel, zinc, indium, copper and bismuth content determination.

GB/T 24268-2009: Test methods for chemical analysis of silver-tin oxide electric contact material

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Test methods for chemical analysis of silver-tin oxide electric contact material ICS 29.120.99 K14 National Standards of People's Republic of China Chemical analysis of silver tin oxide electrical contact materials 2009-06-19 release 2010-02-01 Implementation General Administration of Quality Supervision, Inspection and Quarantine of the People 's Republic of China China National Standardization Management Committee released Directory Preface III 1 Scope 1 2 Determination of silver 1 2.1 Principle of the method 1 2.2 Reagent 1 2.3 Analysis Step 1 2.4 Calculation of the results of the analysis 2 2.5 precision 2 3 Determination of tin 2 3.1 Principle of the method 2 3.2 Reagent 2 3.3 Equipment 2 3.4 Analysis Step 2 3.5 Calculation of the results of the analysis 3 3.6 precision 3 Determination of nickel, zinc, copper and indium 3 4.1 Principle of the method 3 4.2 Reagent 3 4.3 Instrument 4 4.4 Analysis Step 4 4.5 Calculation of the results of the analysis 5 4.6 precision 5 Determination of bismuth 6 5.1 Principle of the method 6 5.2 Reagent 6 5.3 Instrument 6 5.4 Analysis Step 6 5.5 Analysis of the results of the calculation 6 5.6 precision 7 Appendix A (informative) Instrument operating conditions 8 Reference 9

Foreword

Appendix A to this standard is an informative appendix. This standard is proposed by China Electrical Equipment Industry Association. This standard is under the jurisdiction of the National Electrotechnical Standardization Technical Committee (SAC/TC228). This standard is responsible for the drafting unit. Guilin Jingu electrical electronic materials Technology Co., Ltd., Fuda Alloy Co., Ltd., Foshan precision electrical Engineering Co., Ltd., Wenzhou Hongfeng Electrical Alloy Co., Ltd. This standard participates in the drafting unit. Guilin Electric Science Research Institute, China and Greece Alloy Co., Ltd., Shaoxing County Hongfeng Chemical Metal Products Factory, Wenzhou Poly Star Contact Ltd. The main drafters of this standard. Liu Yueping, Chen Xiao, Chen Lansheng, Bai Xiaoping, Zhang Xiaohui, Yang Xiaoling, Xie Yongzhong, Zheng Yuanlong, Chen Dafeng, Ma large, Chen Jingsheng. Chemical analysis of silver tin oxide electrical contact materials

1 Scope

This standard specifies the determination of silver, tin, nickel, zinc, indium, copper and bismuth in silver tin oxide or silver tin oxide indium oxide electrical contact materials. This standard is applicable to the determination and determination of silver, tin, nickel, zinc, indium, copper and bismuth in silver tin oxide or silver tin oxide indium oxide electrical contact materials The range is. 80.00% to 94.00% (silver), 3.00% to 13.00% (tin), 0.03% to 1.00% (nickel), 0.05% to 1.00 % (Zinc), 0.20% to 5.00% (indium), 0.20% to 1.00% (copper), 0.20% to 1.50% (bismuth).

2 Determination of silver

2.1 Principle of the method After the decomposition of nitric acid with ammonium sulfate as an indicator, with potassium thiocyanate standard titration solution titration, thiocyanate first with the solution Silver ion reaction to produce insoluble silver thiocyanate silver precipitate, when the silver ions precipitate completely, excess of a drop of thiocyanate and ferric ions Generating red iron thiocyanate complex, that is, the end point. 2.2 Reagents 2.2.1 nitric acid Nitric acid (1 + 1). 2.2.2 Potassium thiocyanate standard titration solution Potassium thiocyanate standard titration solution [c (KCNS) = 0.04 mol/L]. 2.2.2.1 preparation Weigh about 9.7g potassium thiocyanate dissolved in water, diluted to 2500mL, fully mixed evenly, put it aside for 3 days. 2.2.2.2 Calibration Weigh 0.1000 g of sterilized silver (99.99%) in 250 mL Erlenmeyer flask, add 10 mL of nitric acid (2.2.1), heat at low temperature Dissolved, boiled to remove the yellow smoke, cooled to room temperature, add water to 100mL, add 5mL ammonium ferric sulfate (2.2.3), with potassium thiocyanate standard titration solution Liquid (2.2.2) titrated to light red as the end point. Per kilogram of potassium thiocyanate standard titration solution is equivalent to the amount of silver according to formula (1). (1) Where. V - titration of pure silver consumed by potassium thiocyanate standard titration solution in milliliters (mL). Weigh 2g of ammonium ferric sulfate dissolved in 100mL water, dropping just boiled nitric acid (2.2.1) to brown faded. 2.3 Analysis steps 2.3.1 Determine the environment Determination of the environment should be no hydrochloric acid mist. 2.3.2 sample Weigh 0.1g sample, accurate to 0.0001g. 2.3.3 Determination 2.3.3.1 Place the sample (2.3.2) in a 250 mL Erlenmeyer flask and add 10 mL of nitric acid (2.2.1) to the furnace for low temperature heating. The material is completely dissolved and boiled to remove the yellow smoke and cool to room temperature.

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