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

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Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users

Language(s)

English

Published date

10-27-2017

Publisher

International Organization for Standardization

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.

Committee	ISO/TC 155
DevelopmentNote	Supersedes ISO/DIS 7529. (10/2017)
DocumentType	Standard
Pages	5
PublisherName	International Organization for Standardization
Status	Current
Supersedes	ISO 7529:1989

ISO 9725:2017

Nickel and nickel alloy forgings

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ISO 1042:1998	Laboratory glassware One-mark volumetric flasks
ISO 648:2008	Laboratory glassware — Single-volume pipettes
ISO 5725:1986	Precision of test methods Determination of repeatability and reproducibility for a standard test method by inter-laboratory tests