The problem of reducing the mass of modern equipment while increasing its working properties is challenging today. The application of aluminium alloys in the oil and gas industry creates an oxide layer on their surfaces, with wear resistance of up to the level (or above) that of the steel materials that are currently applied. The effects of ozone and the use of ultrasound to increase the hardness, wear resistance and corrosion resistance of the anode coating have been determined. Three facilities for the anodizing of aluminium and its alloys have been patented. The injection of ozone into the air mixture increases the thickness of the alumina by 45-53% and an additional application of the ultrasound increases the microhardness of the coating by almost a factor of 1.5. The facts are explained by the increase of the proportion of the alumina crystals in the coating. The structure of the anode film has been studied with an increase of more than 2200 times. First, the possibility of the formation of secondary channels due to the amorphous component of the coating has been established. On the basis of the obtained data, a technology for anodizing the real parts of the oil and gas equipment made from aluminium alloys instead of steel equipment has been developed. The nozzle and the mixing chamber of the jet pump, the sliding bearing collar, safety shirts, guide vanes and intersection pump packings for maintaining the reservoir pressure have been manufactured from the alloy D16. Anodized aluminium parts are successfully operated in an aggressive environment without shock loads. The magnitude of wear decreased by more than a factor of seven in comparison with the serial parts.

Structured alumina is currently used in a wide range of applications. Interest in a surface with a wear-resistant coating motivates creation of methods for high-speed oxidation with an increase in the thickness and hardness of the layer, with obligatory observance of environmental parameters and a decrease in the energy intensity of production. Considering the activity of aluminum towards oxygen, a very important aspect is the search for conditions to increase the natural oxide film to the level of functional significance. The generally accepted scheme of classical anodizing represents a closed system of an electrolytic cell, inside which the elements are activated in the interelectrode gap to the state of ionic excitation under the action of an electric field. The efficiency of interaction depends on the medium’s nature and variability of the volt-ampere parameters. This work proposes a different mechanism for intensifying the process. Oxygen is activated outside the electrolytic cell and in the allotropic state, in the form of ozone, is transmitted into the interelectrode gap. The phase composition, structure, thickness, and microhardness are investigated. The aim of the research is to establish the effect of ozone on the oxidation process.

This article discusses the ways of intensification of the oxidation process with the formation of surface properties necessary to increase the service life of one of the parts of an internal combustion engine - a cylinder made of cast aluminum alloy. A brief overview of existing technologies for hardening the aluminum surface is presented. Environmentally friendly options are proposed for using the potential of processes that have accumulated energy within an electrolytic cell by activating the interelectrode gap and forming an oxide with desired properties. The main difference from the existing model approaches of oxide formation lies in the parallel excitation of the main participant in the process, oxygen, in order to dominate it over other, oxygen-containing donors. Ways of using the energy of cavitation phenomena due to acoustic resonance in an electrolytic solution are proposed. Redistribution of the field potential by replacing a flat cathode with a pointed one changed the conductivity conditions in the interelectrode gap as a result of the electroconvective action. The structure of the oxide layer, phase changes, and physical properties confirming the originality of oxide coatings have been investigated.