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scientific edition of Bauman MSTU


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.

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