Phase transformations and electrochemical characterizations of electrodeposited amorphous Fe–W coatings
2015; Elsevier BV; Volume: 286; Linguagem: Inglês
10.1016/j.surfcoat.2015.12.011
ISSN1879-3347
AutoresSong Wang, Cheng Zeng, Yunhan Ling, Jianjun Wang, Guiying Xu,
Tópico(s)Corrosion Behavior and Inhibition
ResumoIron–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.
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