Effect of Heat Treatment on the Phase Composition of Copper-Zinc Coating on Steels

• Published in: Metal science and heat treatment 2023-11, Vol.65 (7-8), p.395-399
• Main Authors: Arkhipov, V. E., Murav’eva, T. I., Moskvitin, G. V., Pugachev, M. S., Shcherbakova, O. O.
• Format: Article
• Language: English
• Subjects: Aluminum oxide; Characterization and Evaluation of Materials; Chemical composition; Chemistry and Materials Science; Classical Mechanics; Coatings; Copper; Corundum; Diffraction; Engineering Thermodynamics; Heat and Mass Transfer; Heat treatment; Materials Science; Metallic Materials; Phase composition; Solid solutions; Spectrum analysis; Spraying; Steel; Thermochemical Treatment and Coatings; X-rays; Zinc coatings; Zinc industry
• ISSN: 0026-0673; 1573-8973
• DOI: 10.1007/s11041-023-00945-8

The structure of a copper–zinc coating deposited onto steel 40Kh at 450°C by the method of gas-dynamic spraying of a mechanical mixture of copper, zinc and corundum particles with 2-mm displacement of the sprayer nozzle is studied. The coated specimens are heat treated in a furnace at 420 – 430°C for at most 180 min. The structure and the chemical composition of the coating are studied by the methods of x-ray diffraction phase analysis and microscopic spectrum analysis. It is shown that the spraying is accompanied by diffusion of copper into zinc, which yields an electron-type solid solution based on Cu 5 Zn 8 (a γ-phase). After the heat treatment at 420 – 430°C for 180 min the coating contains a solid solution of zinc in copper (an α-phase) and an electron-type solid solution based on CuZn (a γ ′ -phase). The chemical and phase compositions of the coating correspond to duplex brass L65.