Abstract
To improve corrosion and wear resistances of the Zirconium(Zr) based alloys which are widely applied in nuclear reactors and chemical corrosion-resistant equipment, a new surface modification scheme was designed to deposit a Zr75Cu25 coating on Zr substrate by using magnetron sputtering technique. The microstructure and the phase composition were characterized by scanning electron microscope, transmission electron microscope, and X-ray diffraction measurements. The tribological properties and the corrosion resistance were investigated by performing reciprocating tribo-tester and electrochemical tests, respectively. It is found that the Zr75Cu25 coating is made up of a mixture of amorphous and α-(Zr) nanocrystalline phases. The nanocrystalline particles with a size of 5–10 nm are homogenously dispersed in the amorphous matrix. The Zr75Cu25 coating shows excellent tribological properties, due to the dispersion strengthen caused by the homogeneous distribution of α-(Zr) nano-size particles among the amorphous matrix. In addition, it is revealed that the Zr75Cu25 coating makes the Zr substrate exhibit excellent corrosion resistance, due to the robust passive film with a compact structure of the amorphous/nanocrystalline mixture.
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