Abstract
Pack cementation method was used to form high activity aluminide coating on titanium alloy Beta-21S using a cement activated by CrCl3 at 760 °C for a period of 9 h. Thermodynamic computations showed that growth mechanism of TiAl3 occurs in tree steps involving different chemical reactions. The effectiveness of the TiAl3 coating to protect Beta-21S alloy was demonstrated through oxidation tests performed at 750 and 850 °C during 300 h. The elevated resistance against oxidation of the TiAl3 layer is provided by a protective Al2O3 scale having low growth kinetics.
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