Abstract
The development of the modern industry requires to develop high-performance, environmentally friendly methods for the production of light structural material surface coatings. The use of products and structures made of titanium and its alloys with high wear resistance and corrosion resistance prevails in many industries, in particular in the aerospace industry, shipbuilding, and transport engineering. Nowadays, the application of the plasma electrolytic oxidation method, a promising metal surface treatment method, is of increasing interest. Besides this method is called microarc oxidation. The objective of this work is to study the properties of oxide coatings obtained on titanium alloys under the influence of rapid pulsed effects of the plasma electrolytic oxidation process. Oxide composite coatings were obtained in various electrolyte solutions in this work. Oxide coatings are characterized by high wear resistance. It has been established in tribological tests that the wear resistance of the coating is increased by 2–15 times compared with an uncoated sample. The friction coefficient curves obtained for coated samples show that there is no destruction of the coating to the base. The breaking-in area is marked in the curves. The friction surfaces are adjusted to each other and go to a stable friction mode. The latter results in the friction coefficient decrease and wear rate decrease.
Highlights
Nowadays titanium and its alloys are widely used in aerospace and other industries due to their high specific characteristics
The plasma electrolytic oxidation method enables to modify the surface of titanium and its alloys and to obtain coatings with various properties
Studies of the wear resistance of oxide coatings showed a significant increase compared with an uncoated sample
Summary
Nowadays titanium and its alloys are widely used in aerospace and other industries due to their high specific characteristics. There are areas of application where the use of these alloys is limited by their low hardness and wear resistance. The problem of surface modification of titanium alloys is relevant. The method of plasma electrolytic oxidation (PEO), a relatively new method used to treat the valve metals surface, is of interest [1,2,3]. A characteristic feature of PEO is the use of surface microdischarges to form a coating having a very significant and specific effect on the coating formed [4,5,6,7]. The oxide coatings obtained due to microplasma treatment in electrolyte solutions have high ad-
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