Determination of boron in alloys of Ni–Ti system

Goundobin N.V., Titov V.I., Pilipenko L.V., Dvoretskov R.M.
UDC
621.3.088:669.245
DOI
10.18577/2307-6046-2016-0-1-56-61
Article PDF (Russian) (454.23 KB)
How to cite
Goundobin N.V., Titov V.I., Pilipenko L.V., Dvoretskov R.M. Determination of boron in alloys of Ni–Ti system // Proceedings of VIAM. 2016. No. 1. DOI: 10.18577/2307-6046-2016-0-1-56-61. URL: https://test.viam.ru/en/journal/2016/1/8
Abstract

This article describes a technique of the determination of boron (0,002–0,1 % wt.) in alloys of the Ni–Ti system (nitinol) using extraction-photometric method. To perform photometric measurements of solutions of Ni-Ti alloy nitrochrompyrazol reagent was selected, which forms a complex compound of magenta color with an anion of BF4- in the acidic solution of boron-bearing alloy. The intensity of color is proportional to boron concentration in the sample solution. In order to enhance reproducibility of analysis, reduce errors and eliminate the influence of impurities Nb, Ti, Zr, Fe, W and others, which are often presented in alloys of this type, a method of separating nitrochrompyrazol-boron complex compound from interfering components of alloy by means of its extraction by dichloroethane is proposed. On basis of the study a measurement technique of extraction-photometric determination of boron in the concentration range of 0,002–0,1% wt. in alloys of the Ni–Ti system has been developed

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