| The cold gas dynamic spray was used to prepare the Al-Pb alloys coating on 40Cr-steel substrates in this study with the mixture of pure Al powder and pure Pb powder. The coating's phases, microstructure and mechanics performance were investigated by mean with X-ray diffraction, optics microscope, scan electron microscope, micro-hardness. Make preliminary discussion on the bonding mechanism in cold gas spraying Al-Pb alloy coating. The microstructure of a cold gas sprayed Al-Pb alloy coating was shown by optics and scan electron microscope that Pb has a uniformity distribution in Al base .The interface between the coating and the substrate is free of any defects, therefore, the adhesion of this coating should be excellent. Wear experiment shown Al-Pb alloy coating has good antifrictional properties. In the course of friction one intact lead film come into being and lubricate the wear substrates. The coefficient of friction and wear rate was effective reduced.
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