The present work focuses on a new method combining cast-infiltration with thermal spraying technology to improve the surface corrosion resistance of magnesium alloy.A zinc-based alloy layer was fabricated on the surfa...The present work focuses on a new method combining cast-infiltration with thermal spraying technology to improve the surface corrosion resistance of magnesium alloy.A zinc-based alloy layer was fabricated on the surface of AZ91D magnesium alloy. The microstructure of the layer was characterized by scanning electron microscopy equipped with an energy dispersive X-ray spectroscopy(EDS).The phase constituent of these alloys was identified by X-ray diffractometry(XRD).The analysis results reveal that a zinc-based alloy layer with a thickness of 700μm can form on the surface of AZ91 alloy matrix.The layer is composed of Mg7Zn3,MgZn and a small amount of α-Mg solid solution.The results indicate that the corrosion-resistance of the specimen with a zinc-based alloy layer is much better than that of the specimen without the layer after being immersed in 5%NaCl solution for 240 h, and the layer is more protective for the AZ91 alloy.展开更多
The reactive cast-infiltration technique was used to produce an Fe-WC surface composite layer on an iron casting, in which the WC particulates were formed in situ from a reaction of W with C. The structure and phase c...The reactive cast-infiltration technique was used to produce an Fe-WC surface composite layer on an iron casting, in which the WC particulates were formed in situ from a reaction of W with C. The structure and phase construction of the surface composite were evaluated by using X-ray diffraction (XRD), scanning electron microscope (SEM), energy-dispersive X-ray (EDS), etc. An Fe-WC surface composite layer with a volume fraction of WC particles up to 30％ and particle size in the range 10～30 μm was successfully produced. Abrasive resistance test results show that the Fe-WC surface composite layer possesses great abrasive resistance.展开更多
文摘The present work focuses on a new method combining cast-infiltration with thermal spraying technology to improve the surface corrosion resistance of magnesium alloy.A zinc-based alloy layer was fabricated on the surface of AZ91D magnesium alloy. The microstructure of the layer was characterized by scanning electron microscopy equipped with an energy dispersive X-ray spectroscopy(EDS).The phase constituent of these alloys was identified by X-ray diffractometry(XRD).The analysis results reveal that a zinc-based alloy layer with a thickness of 700μm can form on the surface of AZ91 alloy matrix.The layer is composed of Mg7Zn3,MgZn and a small amount of α-Mg solid solution.The results indicate that the corrosion-resistance of the specimen with a zinc-based alloy layer is much better than that of the specimen without the layer after being immersed in 5%NaCl solution for 240 h, and the layer is more protective for the AZ91 alloy.
文摘The reactive cast-infiltration technique was used to produce an Fe-WC surface composite layer on an iron casting, in which the WC particulates were formed in situ from a reaction of W with C. The structure and phase construction of the surface composite were evaluated by using X-ray diffraction (XRD), scanning electron microscope (SEM), energy-dispersive X-ray (EDS), etc. An Fe-WC surface composite layer with a volume fraction of WC particles up to 30％ and particle size in the range 10～30 μm was successfully produced. Abrasive resistance test results show that the Fe-WC surface composite layer possesses great abrasive resistance.
