On the Determination of Boron Nitride in Steel by Means of Electrolytic Extraction-Infrared Spectrometry
1978 Volume 64 Issue 5 Pages 640-649
Details
1978 Volume 64 Issue 5 Pages 640-649
A study was made to establish the reliable method for the determination of boron nitride (BN) in steel.
The recommendable procedure is as follows: The residue isolated from steel by electrolytic method is collected with a micropore filter (pore size, 0.2μ). The filter is incinerated by use of low temperature hydrogen plasma to decompose the organic substances that affect IR spectrum of BN. As cementite decreases the percentage of transmission of infrared rays, it is decomposed by the immersion in chemical agents solu-tion or by controlled-potential electrolysis. The residue thus freed from cementite and filter is mixed with potassium bromide, prepared into a disk of 10mm in diameter, and absorption intensity of the characteristic band at 1390 cm-1 is measured.
By the method established, it is possible to analyze quantitatively a very small amounts of BN, down to about 0.0003% in steel.
