Features for formation of copper-zinc coatings

Abstract

The results of X-ray diffraction and microspectral analysis of a copper-zinc coating applied by gas-dynamic spraying using a mechanical mixture of copper, zinc and corundum particles with subsequent heat treatment in a furnace in the temperature range of 420...430 °C and a holding time of up to 180 minutes are presented. It is shown that during the deposition process, copper diffuses into zinc and a gradient structure based on copper, zinc and an electron-type solid solution based on Cu5Zn8 (γ-phase) is formed, the mass fraction of which is 31, 16 and 47 %, respectively. Based on the analysis of the results of microspectral analysis, the diffusion coefficient in copper to zinc is calculated, which is equal to DCu = 0.72•10–12 m2 /s. It was found that after exposure in the furnace for 180 min, the phase composition of the copper-zinc coating (α-phase and β′-phase) corresponds to brass grade CW508L. Based on the analysis of the change in the grating period of copper, depending on the exposure time, it is shown that the heat treatment field with an exposure time in the furnace of 60 min coating can be considered brass.