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Registration Number

0221U101406, R & D reports

Title

Development of synthesis methods for solid anode wear-resistant layers on structural aluminum alloys

Head

Student Mykhaylo M., Доктор технічних наук

Registration Date

21-01-2021

Organization

Karpenko Physico-Mechanical Institute of NASU

Description

 The equipment was modernized, which made it possible to carry out the process of hard anodizing of aluminum alloys in the temperature range of -4 ... 0 ° C. A switching power supply was manufactured, which allows the process of hard anodizing at room temperature and a significantly lower electrolyte concentration. The influence of the current-voltage characteristics of the hard anodizing process, the chemical composition of the electrolyte on the structure and phase composition of the oxide layer on aluminum alloys of the Al-Cu alloying system has been investigated. Having studied the change in the forming voltage during the anodic treatment of the AD0 (1011) aluminum alloy, we found that at a constant current density of 5 A at the initial moment, the forming voltage strongly increases, obviously, this is associated with an increase in the thickness of the oxide layer, and after 30 min it decreases strongly due to the accumulation of aluminum ions in the pores of the oxide layer. It was found that the oxide layer (Al2O3  H2O) in the process of hard anodizing (Hard Anodic Coatings) on aluminum alloys is formed not only by oxygen ions, which are formed during the decomposition of water, but also by neutral oxygen atoms, which are formed during the decomposition of hydrogen peroxide H2O2 and ozone O3 ... It was found that the addition of a 20% aqueous solution of H2SO4 hydrogen peroxide (H2O2) to the electrolyte for solid anodizing, as well as blowing it with an air-ozone mixture, increases the thickness and microhardness of the anodized layer by 50%, due to a halving of the number of water molecules in aluminum oxide (Al2O3  1.5 H2O).

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