Standard No.:	JB/T 9548.4-1999
English Name:	Methods for chemical analysis of iron-chromium-aluminium alloys The photometric acid dehydration gravimetric mehtod for the determination of silicon content
Chinese Name:	铁铬铝合金化学分析方法 高氯酸脱水重量法测定硅量
Chinese Classification:	K14    Electrician alloy parts
Professional Classification:	JB    Professional Standard - Machinery
Issued by:	State Bureau of Quality and Technical Supervision
Issued on:	1999-8-6
Implemented on:	2000-1-1
Status:	valid
Superseding:	ZB K 14003.4-1988 铁路铝合金化学分析方法 高氯酸脱水重量法测定硅量
Language:	English
File Format:	PDF
Word Count:	2000 words
Price(USD):	164.00
Delivery:	via email in 1 business day

1 Scope



This standard specifies the photometric acid dehydration gravimetric method for the determination of silicon content in iron-chromium-aluminium alloys.

This standard is applicable to the determination of silicon content in iron-chromium-aluminium alloys, and the determination range is from 0.10% to 1.00%.



2 Method Summary



The test portion will be dissolved in acid, and will be heated with perchloric acid and smoke to dehydrate the silicic acid, the silicic acid will be filtered, washed and burnt into silicon dioxide. The silicon will be treated with sulfuric acid-hydrofluoric acid to become into silicon tetrafluoride, and the silicon tetrafluoride will evaporate to remove the silicon, hereby, the percentage content of silicon can be calculated according to the difference in mass before and after removing silicon.

Contents
Foreword I
1 Scope
2 Method Summary
3 Reagents
4 Analytical Procedures
5 Calculation of Analysis Results
6 Permissible Deviation