Standard No.:	JB/T 9548.1-1999
Chinese Name:	铁铬铝合金化学分析方法 库仑法测定碳量
English Name:	Methods for chemical analysis of iron-chromium-aluminium alloys Coulombic method for the determination of carbon content
Professional Classification:	K14 Electrician alloy parts
Professional Classification:	JB Professional Standard - Machinery
Issued by:
Issued on:	1999-08-06
Implemented on:	2000-01-01
Status:	VALID
Language:	English
File Format:	PDF
Word Count:
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1 Scope

This standard specifies the coulombic method for the determination of carbon content in iron-chromium-aluminium alloys.
This standard is applicable to the determination of carbon content in iron-chromium-aluminium alloys, and the determination range is from 0.01% to 0.20%.

2 Method Summary

The test portion will produce carbon dioxide by burning at high temperature in oxygen stream, meanwhile, the produced gas will be sent into the barium perchlorate solution of the given pH value by using oxygen as the carrier gas, and here the pH value of the solution will change, and the absorption solution will be electrolyzed by the pulse current with constant electric quantity to restore to its original pH value. The pulse number shall be recorded with counter and this pulse number is proportional to the carbon content, thereby, the percentage content of carbon may be calculated.