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The determination of columbium in rustless and heat-resisting steels. Part I

✍ Scribed by Bagshawe, B. ;Elwell, W. T.

Publisher
Wiley (John Wiley & Sons)
Year
1947
Weight
393 KB
Volume
66
Category
Article
ISSN
0368-4075

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✦ Synopsis

Abstract

A procedure is described for the determination or columbium in rustless and heat‐resisting high chromium nickel steel. Provision is made for the presence of tungsten, titanium, and molybdenum. By a slight adjustment of conditions, tungsten precipitation is quantitative and a simultaneous determination may be made. The efficiency of hydrolysis separations is discussed and a method of sulphurous acid hydrolysis from divalent iron solution recommended. An examination of the separation of columbium from tungsten by the magnesia method^1^ has indicated that errors are introduced due to the formation of colloidal columbic acid which prevents a quantitative separation of these two metals. Colloid formation is overcome by using a modified wash liquor. This paper is the first of two to be published on this subject.

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