A zirconium-and Cr(III)-containing conversion coating on Al alloy 2024-T3 was prepared in solution containing Cr 2 (SO 4 ) 3 and K 2 ZrF 6 . Its composition was analyzed by energy dispersive X-ray spectrometry (EDS), and its corrosion resistance was investigated using polarization curve, electrochemical impedance spectroscopy (EIS), and salt spray exposure. An artificial scratch cell was used to investigate its "self-repairing" effect by EIS and X-ray photoelectron spectroscopy (XPS). In addition to Al, the conversion coating contained Zr, Cr, O, and F. The conversion coating provided obvious corrosion protection for the Al alloy 2024-T3. The EIS measurement and corrosion morphology observation of bare samples (i.e., uncoated samples) in the artificial scratch cell confirmed that the conversion coating possessed "self-repairing" effect. XPS analysis showed that Cr(III) species, but not Zr species were transported from the conversion coating to the nearby bare area as in a scratch.
Fe 2 O 3 /Fe foils were prepared by anodic oxidation of Fe foils in saturated NaF solution kept at 70uC and subsequent calcination at 400uC. The morphology of anodised Fe foils was affected remarkably by anodic voltage and time. When pulse anodisation was applied, clusters that consisted of nanograins were formed on the Fe foils. The X-ray diffraction and Fourier transform infrared data suggested that the cluster products transformed to Fe 2 O 3 after calcining at 400uC for 2 h. According to thermogravimetry-differential scanning calorimetry data, the transformation began at y350uC. The Fe 2 O 3 /Fe anodes for Li ion batteries were analysed by means of cyclic voltammograms, electrochemical impedance spectroscopies and discharge/charge curves.
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