Trivalen t Cr layers are studied by direct current brush- plating and pulse current brush-plating. Under the SEM,the appearence,the morphology of cross sections and normal sec- tions of the layers are observed a...Trivalen t Cr layers are studied by direct current brush- plating and pulse current brush-plating. Under the SEM,the appearence,the morphology of cross sections and normal sec- tions of the layers are observed and analysed,the hardness, bond intensities and corrosion- resis- tance are measured. Then, the election- probe and X ray diffraction instruments are used to study the bond and harden mechanism of lavers,The result of research shows that: the harden ef- fect of the layers is caused by the extra- fine grains and internal stress in the layers. And the lay- ers and basis are joined by mechanical bond,metal bond and diffuse bond. All these kinds of bonds lie on different places of interface, they make the layers and base metal unit well.展开更多
文摘Trivalen t Cr layers are studied by direct current brush- plating and pulse current brush-plating. Under the SEM,the appearence,the morphology of cross sections and normal sec- tions of the layers are observed and analysed,the hardness, bond intensities and corrosion- resis- tance are measured. Then, the election- probe and X ray diffraction instruments are used to study the bond and harden mechanism of lavers,The result of research shows that: the harden ef- fect of the layers is caused by the extra- fine grains and internal stress in the layers. And the lay- ers and basis are joined by mechanical bond,metal bond and diffuse bond. All these kinds of bonds lie on different places of interface, they make the layers and base metal unit well.
