High temperature oxidation behavior of TiAl alloy with electrodeposited SiOC coating.

SiOC coating was electrodeposited on TiAl alloy to improve the high temperature oxidation resistance. The mass gain of the compact SiOC coating is 0.06 ± 0.026 mg cm-2, which is one order of magnitude lower than that of TiAl alloy. The SiOC coating exhibits good thermal stability and partial amorphous SiOC transforms into crystal SiO 2 or SiC. After oxidation, no obvious pore can be found in the coating. Moreover, an Al 2 O 3 layer is generated due to the enrichment of Al and the low oxygen partial pressure at the coating/substrate interface, therefore improving the barrier property of the oxide scale. [Display omitted] • SiOC coating is prepared on TiAl alloy by electrodeposition. • The high temperature oxidation resistance of the TiAl alloy with the SiOC coating is dramatically improved. • Thermal exposure results in partial amorphous SiOC transforms into crystal SiO 2 or SiC. • The outward diffused Al can strengthen the network structure of the SiOC coating and establish an Al 2 O 3 intermediate layer. [ABSTRACT FROM AUTHOR]