标准摘要
[中文适用范围]： 本文件规定了测定镍合金中铬含量的电位滴定方法，该镍合金不含不溶性碳化物且钒含量的质量分数小于0.2%。 该方法适用于铬含量在质量分数5%至22%之间。 钒可以作为合金中的杂质存在，会产生正偏置干扰。 然而，在质量分数为 0.2% 的水平下，该偏差相当于铬的质量分数为 0.068%，约为该方法再现性的一半。 [外文原描述]： 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.
英文名称Nickel alloys — Determination of chromium content — Potentiometric titration method with ammonium iron(II) sulfate