Shtokal

pp. 1-14

pp.162-178

pp. 169-176

The paper emphasizes that owing to micro-arc oxidation coating the performances of spacecraft units from aluminium can be significantly expanded. The properties of micro-arc oxide coatings, which may be achieved by using the cutting-edge covering technologies, are given. The comparative mass reduction as a result of the replacement of greater density metals for the aluminium alloys after the micro-arc oxidation is calculated by example of a typical unit of the spacecraft. The paper offers optimal methods for the micro-arc oxidation of different configurations parts of aluminium alloys.

Use of titanium alloys in marine environment imposes high requirements on the material quality of contacting parts. Micro-arc oxidation (MAO) is a widely used technique for forming a stable oxide layer with anti-scoring protection. Electrochemical techniques may be difficult to implement for treatment of large size structures, since they require large capacity electrolytic baths as well as high power current sources. Untraditional technical approaches are sought for forming a localized oxide layer on large size structures. This paper describes micro-arc oxidation techniques and equipment which simplify the oxidation bench design, reduce its overall dimensions and electrolyte consumption, as well as electric energy consumption, providing quality anode coating on large nomenclature of titanium alloy parts. The specified problem is tackled due to use of devices that provide local oxidation and are moved along the whole surface of a detail or just along necessary areas. This fact leads to a significant reduction in required power of current sources because MAO occurs in a small area. It also simplifies the cooling process.