Preparation of TiB2 coated cathode of Al electrolysis

TiB2 coating was prepared by electrodeposition from KCl-KF-K2TiF6-KBF4 molt en salts on graphite substrate at 810 degreesC. The coating is affected by protective gas, current density, and electrolyte compositions. From a serie s of tests it can be concluded that when the following conditions are used, TiB2 coating will be compact and homogeneous, and the layer of coating has higher TiB2 content, and also has good coherence to graphite matrix. The e lectrolysis conditions are as follows: KCl 5%, KF 60 similar to 70%, K2TiF6 10%, KBF4 20 similar to 30%, (mole fraction), current density being 0.4 si milar to0.8 A/cm(2) and Ar being used as protective gas.