Study on Electrodeposition of TiB2 Coating on Graphite Substrate

Abstract:

In this paper TiB2 coating was electrodeposited on the graphite by K2TiF6-KBF4-KF-KCl molten salts. The effects of pre-electrolysis conditions and electroactive component contents on the properties of coating were tested. The results showed that: pre-electrolysis conditions had important effect on the compositions of coating; as the mole ratio of K2TiF6 and KBF4is 1:2.5 with higher total content of K2TiF6-KBF4, the coating had better adhension to the substrate and the process had good repetition, but the crystal particle was large and the coating has less impurity; as the mole ratio of K2TiF6 and KBF4is 1:7.5 with lower total content of K2TiF6- KBF4, the coating had fine crystal particle and higher TiB2 content with metallic gloss, but the process had bad repetition. Further electrochemistry experiments need to be done to find the mechanism and stable conditions for electrodepositing of TiB2 coating.

Key words:graphite,electrodeposition,TiB2,coating