标准编号：ISO 7529:2017
中文名称：镍合金 铬含量的测定 用硫酸铁（II）铵电势滴定法
英文名称：Nickel alloys — Determination of chromium content — Potentiometric titration method with ammonium iron(II) sulfate
发布日期：2017-10
标准范围
This document 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 % to 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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