•Amorphous Fe–W coating was prepared by pulsed electrodepositing.•Crystallization intensifies with rising temperature, and fully completed after 600 °C.•The Fe–W coating annealing at 500 °C displayed the highest corrosion resistance.Iron–tungsten with satisfactory corrosion properties is a promising alloy to replace hard chromium. In this work, Fe–W amorphous coatings were prepared by electrodepositing from an aqueous solution and a subsequent heat treatment at 400 °C, 500 °C, 600 °C, 700 °C and 800 °C, respectively. Corrosion behavior of the coatings deposited on copper substrates was studied using potentiodynamic polarization and impedance spectroscopy techniques in 0.1 mol·L− 1 aqueous NaCl solution. As the annealing temperature raises the corrosion resistance of Fe–W coatings increases, and reaches the maximum at 500 °C and then shows a converse variation after 500 °C. This might relate to the surface reconstruction both on the morphology and the chemical oxidation.

Various reductants and surfactants were used to investigate their effects on the structure of Bi2Te3 nanopowders prepared via hydrothermal synthesis at 150°C for 24 h. X-ray diffraction (XRD), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM) were applied to analyze the phase distributions, microstructures, and grain sizes of the as-grown Bi2Te3. The results showed that the grain sizes and morphologies of the synthesized powders were mainly related to the effects of the reductants on the nucleation rate and the surface-adsorbed energy of the diverse surfactants on special crystal planes. Some surfactants could control the growth of the Bi2Te3 crystals and promote one-dimensional growth of nanorods during hydrothermal synthesis.