ISO 7529:2017

International Standard   Current Edition · Approved on 27 October 2017

Nickel alloys — Determination of chromium content — Potentiometric titration method with ammonium iron(II) sulfate

ISO 7529:2017 Files

English 5 Pages
Current Edition
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ISO 7529:2017 Scope

ISO 7529:2017 specifies a potentiometric titration method for the determination of chromium content in nickel alloys which do not contain insoluble carbides and which have a vanadium content less than a mass fraction of 0,2 %. The method is applicable to chromium contents between a mass fraction of 5 % and a mass fraction of 22 %.

Vanadium, which can be present as an impurity in the alloy, will give a positive bias interference. However, at a level of a mass fraction of 0,2 %, this bias is equivalent to a mass fraction of 0,068 % chromium, which is about half the reproducibility of the method.

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