A Si/SWNT 3D-composite-nanonetwork integrated anode for high-performance lithium storage, through a combined process of electrostatic induced self-assembly and film transfer.
In this paper, the effect of zinc dipping pretreatment on corrosion resistance of electroless nickel plating on magnesium alloy was studied. The results showed that the corrosion resistance of nickel coating was influenced greatly by the complexing agent and main salt in the zinc dipping solution, and the formula and technological conditions of zinc dipping were optimized by the orthogonal test. The optimum formulation and process conditions were as follows: C 4 H 6 O 5 40 g L −1 , ZnSO 4 •7H 2 O 40 g L −1 , NaF 4 g L −1 , pH 9, temperature 90°C, time 10 min. The corrosion resistance, morphology and phase composition of the nickel coating prepared under the optimum conditions were analysed by SEM, XRD and electrochemical workstation. The results showed that the self-corrosion potential of the nickel coating is 0.87 V higher than the magnesium alloy substrate, the self-corrosion current reduces by two orders of magnitude and the magnesium alloy substrate is completely covered. The corrosion resistance of magnesium alloy was effectively enhanced.
The solidified process of the rhenium-containing nickel-based superalloys was investigated in this paper. The solidified experiments of samples were carried out in a silicon carbon tube furnace with following water quenching. Microstructure of samples and subsequent compositional analysis of solidified ones were determined by an optical microscope (OM) and electronic probe micro analysis (EPMA), respectively. The results show the initial temperature, final temperature and the temperature interval of solidification keep constant with increasing content of Re in alloys under the test conditions, demonstrating the similar solidification sequences. With increasing Re element in alloy, the segregation coefficient of Al, Cr, Co, Mo, and Ta slightly varies, but the segregation coefficient of W obviously decreases.
Effects of Ru on the corrosion resistance of Ni‐base superalloys are still controversial. In the paper, the influence of Ru on the hot corrosion behaviour of Ni‐based superalloys containing a higher level of Cr was investigated. Results show that corrosion resistance of the superalloy with high Cr content is enhanced with the increase of Ru. The reason for this is that the addition of Ru increases the segregation degree of Cr and Mo in the interdendritic region and promotes the formation of a continuous Al2O3 and Cr2O3 layer adjacent to the superalloy.
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