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scientific edition of Bauman MSTU

SCIENCE & EDUCATION

Bauman Moscow State Technical University.   El № FS 77 - 48211.   ISSN 1994-0408

Microarc Oxidation of Product Surfaces without Using a Bath

# 03, March 2015
DOI: 10.7463/0315.0760651
Article file: SE-BMSTU...o014.pdf (970.35Kb)
authors: V.K. Shatalov, A.O. Shtokal, A.A. Blatov

While using an electrochemical method to cover the large-sized work-pieces, units, and products up to 6 м3 by protective coating, there is a certain difficulty to apply traditional anodizing techniques in a plating vat, and it is necessary to find various processing techniques.
To use the existing micro-arc oxide coating (MOC) methods for work-pieces of various forms and sizes in a plating vat is complicated in case it is required to provide oxide layers in separate places rather than over entire surface of a work-piece. The challenge is to treat flat surfaces in various directions, external and internal surfaces of rotation bodies, profiled surfaces, intersections, closed and through holes, pipes, as well as spline and thread openings for ensuring anti-seize properties in individual or small-scale production to meet technical requirements and operational properties of products.
A design of tools to provide MOC-process of all possible surfaces of various engineering box-type products depends on many factors and can be considerably different even when processing the surfaces of the same forms. An attachment to be used is fixed directly on a large-sized design (a work-piece, a product) or fastened in the special tool. The features of technological process, design shape, and arrangement of the processed surfaces define a fastening method of the attachment. Therefore it is necessary to pay much attention to a choice of the processing pattern and a design of tools.
The Kaluga-branch of Bauman Moscow State Technical University is an original proposer of methods to form MOC-coatings on the separate surfaces of large-sized work-pieces using the moved and stationary electrodes to solve the above listed tasks.
The following results of work will have an impact on development of the offered processing methods and their early implementation in real production:
1. To provide oxide coatings on the surfaces of large-sized products or assemblies in a single or small-scale type of production by the other methods is impossible.
2. There is a developed method to calculate volume electrolyte velocity while processing the large-sized work-pieces by means of moved electrode, taking into consideration the modes of MOC-coating formation and a design of the moved electrode. When processing a surface of 1dm2 depending on the modes of MOC-coating formation and a design of the moved electrode the volume electrolyte velocity will make 4 − 6 l/min.
3. A descriptive design-engineering classification of methods for micro-arc oxide coating of separate surfaces of large-sized work-pieces is created on the basis of coated surface geometry, used electrode design, and formation method of a plating vat.
4. The classified methods can be successfully used in creating technologies of large-sized products from titanic alloys, and the offered table is useful both for experts, and for students when studying electrochemical methods of processing.

References
  1. Gordienko P.S., Gnedenkov S.V. Mikrodugovoe oksidirovanie titana i ego splavov [Microarc oxidation of titanium and its alloys]. Vladivostok, Dal'nauka Publ., 1997. 179 p. (in Russian).
  2. Harbcz H., Lewandowska M. Microstructural changes during oxidation of titanium alloys. Materials Chemistry and Physics , 2003, vol. 61, no. 2-3, pp. 542–547. DOI: 10.1016/S0254-0584(03)00070-1
  3. Tinoco J.C., Estrada M., Romero G. Room temperature plasma oxidation mechanism to obtain ultrathin silicon oxide and titanium. Microelectronics Reliability , 2003, vol. 43, no. 6, pp. 895–903. DOI: 10.1016/S0026-2714(03)00098-2
  4. Krupa D., Baszkiewiez J., Sobesak J.W., Bilinski A., Barcz A. Modifying the properties of titanium surface with the aim of improving its bioactivity and resistance. Journal of Materials Processing Technology , 2003, vol. 143-144, pp. 158–163. DOI: 10.1016/S0924-0136(03)00398-4
  5. Zhukov C.B., Kantaeva O.A., Zheltukhin R.V., Epel'fel'd A.B., Ber L.B. I nvestigation of physical and mechanical properties, structure and phase composition of the coatings obtained by the method of microarc oxidation. Pribory = Devices , 2008, no. 4, pp. 28–32. (in Russian).
  6. Suminov I.V., Epel'fel'd A.B., Krit B.L., Borisov A.M., Dun'kin O.N. Plasma surface modification of aviation items. Aviatsionnaya promyshlennost' = Aviation industry , 2002, no. 2, pp. 54–57. (in Russian).
  7. Gnedenkov S.V., Khrisanfova O.A., Sinebryukhov C.L., Puz' A.V., Gnedenkov A.S. Composite protective coating on the surface of titanium nickelide. Korroziya: materialy, zashchita = Corrosion: Materials, Protection , 2007, no. 2, pp. 20-25. (in Russian).
  8. Shatalov V.K., Lysenko L.V. Forming of oxide coatings upon large-dimension products made of titanium alloys. Sudostroenie = Shipbuilding , 2005, no. 1, pp. 58–60. (in Russian).
  9. Shatalov V.K., Lysenko L.V., Sulina O.V. Microarc oxidation of various surfaces of large size structures. Naukoemkie tekhnologii = Science Intensive Technologies , 2012, vol. 13, no. 2, pp. 35–41. (in Russian).
  10. Epel'fel'd A.B. Technology and equipment for micro-arc oxidation . Kvalifikatsiya i kachestvo = Qualification and quality , 2002, no. 4, pp. 33–37. (in Russian).
  11. Suminov I.V., Epel'fel'd A.V., Liudin V.B., Krit B.L., Borisov A.M. Mikrodugovoe oksidirovanie (teoriia, tekhnologiia, oborudovanie) [The micro-arc oxidation (theory, tech-nology, equipment)]. Moscow, EKOMET Publ., 2005. 368 p. (in Russian).
  12. Ponomarev I.S., Krivonosova E.A., Gorchakov A.I. Features of the influence of electric modes on micro-arc oxidation process. Vestnik Permskogo natsional'nogo issledovatel'skogo politekhnicheskogo universiteta. Mashinostroenie, materialovedenie = Vestnik PSTU , 2013, vol. 15, no. 4, pp. 99–103. (in Russian).
  13. Epel'fel'd A.B. Micro-arc oxidation technology. Part 2. Nauchnye trudy MATI (Vestnik MATI) , 2001, no. 4 (76), pp. 185–192. (in Russian).
  14. Shatalov V.K., Shtokal A.O., Rykov E.V., Dobrosovestnov K.B. Application of micro-arc oxidation methods in making the structure elements of spacecraft. Nauka i obrazovanie MGTU im. N.E. Baumana = Science and Education of the Bauman MSTU, 2014, no. 6, pp. 183-192. DOI :10.7463/0614.0712840 ( in Russian ).
  15. Shatalov V.K., Lysenko L.V. Cposob polucheniya zashchitnykh pokrytiy na poverkhnosti metallov i splavov [The method of obtaining protective coatings on the surface of metals and alloys]. Patent RF, no. 2194804. 2002. ( in Russian ).
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