Micro arc oxidation coatings were prepared on AZ91D magnesium alloy in order to evaluate the role of electrical parameters under different work mode. Taking HV hardness and pit corrosion time as investigation index, the optimum process parameters were obtained through orthogonal experiment method. The morphology of coating was observed by scanning electron microscopy (SEM). The results showed that the coatings with dense and few micro pores can be obtained under constant current and power mode, and this kind coatings are of good corrosion resistance and have HV micro-hardness compared with those under constant voltage mode.

In this paper, the NiCu alloy coatings were electroplated on the 304 stainless steel coupon. The XRD was used to identify the phase structure of the as-prepared products. The SEM and EDS were used to observe the surface morphology of the as-prepared coatings and the atomic composition of the as-prepared coatings, respectively. The influences of the pH value on the as-plated NiCu coatings are systematically researched. It was found that the weak acid environment was beneficial to the deposition of nickel copper alloy. With the increasing of the pH value, the content of the copper decrease and that of nickel increase.

The Cu0.81Ni0.19 has been synthesized directly from elemental powder of nickel and copper by mechanical alloying. The alloyed Cu0.81Ni0.19 alloy powders are prepared by milling of 8h. The grain size calculated by Scherrer equation of the NiCu alloy decreased with the increasing of milling time. The end-product was analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM)

The phases of high titanium slag were studied by using XRD and XRF. XRF results show that high titanium slag mainly contains the elements, Ti, Fe, Si, Mn, Al, Ca, P, Zr, Mg, Ba, S, K and etc. XRD results show that the main phases of original high titanium slag are some complex solid solutions, such as (Fe0.33Ti0.46Mg0.21)(Ti1.9Mg0.1)O5, Fe2TiO5, Fe3Ti3O10 and etc, and it also contains a spot of rutile (TiO2). After heat treatment for 10h at 1073K in atmospheric ambient, the main phases have been mostly changed to rutile, with an obviously weight gain about 2.9%. It may be caused by the reaction of high titanium slag with oxygen during heat treatment, and that may be conducive to better quality of the high titanium slag and titanium dioxide.

In this paper the TiNi/Ti2Ni composite powders has been synthesized by the chemical reaction between titanium and nickel powders in high temperature molten salts. Results of the differential scanning calorimetry (DSC) confirmed the reverse martensitic transformation of the prepared TiNi powder in the TiNi/Ti2Ni composite powders. The backscatter electron images of the scanning microscopy (SEM) of the end-products before washing by distilled water showed that the synthesized TiNi/Ti2Ni composite particles were captured by the molten salts, which revealed the mechanism of the chemical reaction in molten salt.