Study of possibility of determination of high cobalt content in titanium-based alloys by photometric method

Goundobin N.V., Titov V.I., Pilipenko L.V.
UDC
535.24
DOI
10.18577/2307-6046-2015-0-2-6-6
Article PDF (Russian) (349.99 KB)
How to cite
Goundobin N.V., Titov V.I., Pilipenko L.V. Study of possibility of determination of high cobalt content in titanium-based alloys by photometric method // Proceedings of VIAM. 2015. No. 2. DOI: 10.18577/2307-6046-2015-0-2-6-6. URL: https://test.viam.ru/en/journal/2015/2/6
Abstract

A possibility of photometric determination of cobalt content in titanium-based alloys within the concentration range of 6–12% mass. was studied. Ethylene diamine (EDA) was used as reactant. The studies were focused on factors of stability in time and selectivity of the reaction of Co with EDA and its influence on light absorption of EDA in combination with some elements contained in the alloys, which form colored EDA (Ni, Cu, Cr) or colorless (Zn, Mo, V, Sn) soluble complexes. It was established that the color of a complex with EDA was stable within several hours. Reaction sensitivity is 0.1 microgram of Co in 1 milliliter of solution. The light absorption of cobalt has its maximum at λ=360 nm. In order to prevent precipitation of titanium, potassium pyrophosphate was applied, since it forms with titanium soluble complexes, which do not affect changes in optical density of Co+EDA complex. This work resulted in the development of a technique for a direct photometric determination of hig

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