Anodic dissolution, passivation and methods for electrochemical polishing of Nb, Ta, Ti in low-temperature carbamide-halide melts
Creators
- 1. Inst. Obshchej i Neorganicheskoj Khimii im. V.I. Vernadskogo NAN Ukrainy, Kiev (Ukraine)
Description
Processes of anodic dissolution of niobium, tantalum and titanium in low-temperature melts of carbamide-NH4Cl and carbamide-NH4F were studied to develop methods of electrochemical polishing of metals. It has been ascertained that electrochemical dissolution of the metals occurs under effect of NCl3 formed at potentials exceeding 1.0 V in chloride system and of F- ion in fluoride system. Electrochemical activity of metals decreases in the series Ti-Nb-Ta in chloride system, being approximately the same for Nb and Ta in fluoride system. Electrochemical activity of metals decreases in the series Ti-Nb-Ta in chloride system, being approximately the same for Nb and Ta in fluoride system. The methods of electrochemical polishing of niobium, tantalum and titanium, developed on the basis of the studies conducted, provide the surface quality meeting the requirements made
Abstract (Russian)
С целью разработки способов электрохимического полирования металлов изучены процессы анодного растворения ниобия, тантала и титана в низкотемпературных расплавах карбамид-NH4Cl и карбамид-NH4F. Установлено, что электрохимическое растворение этих металлов происходит под действием NCl3, образующегося при потенциалах, превышающих 1.0 В, в хлоридной системе, и иона F- во фторидной системе. Электрохимическая активность металлов падает в ряду Ti>Nb>Ta в хлоридной системе и примерно одинакова для Nb и Ta во фторидной системе. Разработанные на основе проведенных исследований способы электрохимической полировки ниобия, тантала и титана обеспечивают качество поверхности, удовлетворяющее предъявляемым требованиямAdditional details
Additional titles
- Original title (Russian)
- Анодное растворение, пассивация и способы электрохимического полирования Nb, Ta, Ti в низкотемпературных карбамид-галогенидных расплавах
Publishing Information
- Journal Title
- Zhurnal Prikladnoj Khimii
- Journal Volume
- 75
- Journal Issue
- 3
- Journal Page Range
- p. 422-427
- ISSN
- 0044-4618
- CODEN
- ZPKHAB
INIS
- Country of Publication
- Russian Federation
- Country of Input or Organization
- Russian Federation
- INIS RN
- 34046571
- Subject category
- S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; S36: MATERIALS SCIENCE;
- Descriptors DEI
- AMMONIUM CHLORIDES; AMMONIUM FLUORIDES; DISSOLUTION; ELECTRIC POTENTIAL; ELECTROLYSIS; ELECTROPOLISHING; MOLTEN SALTS; NIOBIUM; PASSIVATION; REACTION INTERMEDIATES; TANTALUM; UREA
- Descriptors DEC
- AMIDES; AMMONIUM COMPOUNDS; AMMONIUM HALIDES; CARBONIC ACID DERIVATIVES; CHLORIDES; CHLORINE COMPOUNDS; ELECTROLYSIS; ELEMENTS; FLUORIDES; FLUORINE COMPOUNDS; HALIDES; HALOGEN COMPOUNDS; LYSIS; METALS; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; POLISHING; REFRACTORY METALS; SALTS; SURFACE FINISHING; TRANSITION ELEMENTS
Optional Information
- Notes
- 22 refs.; 3 figs.