Preparation and Characterization of TiB2 Coating by Molten Salt Electrodeposition
The lifespan of carbon cathode is affected by the corrosion of molten salt and molten aluminum in aluminum reduction cell,and TiB2 coating is an ideal cathode material for aluminum reduction cells.In this study,TiB2 coatings were electrodeposited on graphite in KF-KCl-K2TiF6-KBF4 molten salt at 700-800 ℃ with the current density of 0.4-0.7A·cm-2.The coatings prepared at different current densities and temperatures were analyzed by XRD,SEM-EDS,surface roughness tester and adhesion tester.The results show that the obtained TiB2 coating is uniform and coherent well to the graphite substrate.Increasing the current density and the electrolysis temperature can refine the grain size of the coating and improve the compactness of the coating.A TiB2 coating with 239 μm in thickness preferred orientation of<110>,and surface roughness of 14.85 μm is achieved,and the adhesion under the optimum condition of 0.6 Acm-2 and 750 ℃ between the coating and graphite substrate is 6.39 MPa.
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