Abstract
Zr75Cu25/S-phase composite films were prepared on 304ss by magnetron sputtering and subsequently oxygen-annealed for improved corrosion and mechanical properties. It was discovered that tetragonal ZrO2 nanoparticles nucleated on the film surface after annealing and Cu atoms segregated at the surfaces as well, when the annealing temperature was increased. The amorphous/crystalline microstructural features of the films were established by transmission electron microscopy and grazing incidence X-ray diffraction. Nanoindentation tests on Zr75Cu25 thin film metallic glasses (TFMGs) were conducted and their corrosion properties in 3.5 wt% NaCl solution examined by potentiostatic polarization and electrochemical impedance spectroscopy. The Zr75Cu25 TFMGs in annealed conditions indicated a superior hardness and Young modulus values. Similarly, the Zr75Cu25 TFMGs, exhibited a better corrosion resistance value as compared with the performance of the 304ss substrate. Potentially, candidate Zr75Cu25 film-based coating materials can be synthesized at the annealing temperature of 350 °C to optimize the performance characteristics of 304ss.
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