Abstract
The effect of Cr additions on the microstructure and corrosion resistance of CuAl10 coating deposited by laser cladding was investigated. Laser cladding was performed using a 4000 W Diode laser under the same conditions, and the premixed powders with different weight ratios of CuAl10 to Cr were fed synchronously by TWIN10C powder feeder and D70 coaxial nozzle. The microstructures were observed under a scanning electron microscope equipped with an energy dispersive X-ray spectrometer (EDS) for chemical analysis, and phase analysis was performed with an X-ray diffractometer (XRD). The electrochemical corrosion behaviors of cladding layers were evaluated. The results showed that the CuAl10 coating has a good metallurgical bonding with the 17-4PH substrate. The addition of Cr can improve the corrosion resistance of CuAl10 coatings, and the passivation ability of the coatings increases with increasing Cr contents. The CuAl10 coating without Cr addition include α, γ2, and K phase; however, the addition of Cr leads to an increase of β′ phase and Cr and a decrease of γ2 and K phase in the CuAl10 coating.
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