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Rabab M. Abou Shahba , Amal S.I. Ahmed , Azza El-Sayed El-Shenawy , Waffa A. Ghannem , Safaa M. Tantawy
International Journal of Chemistry, Mathematics And Physics(IJCMP), Vol-9,Issue-2, April - June 2025, Pages 14-23 , 10.22161/ijcmp.9.2.3
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Article Info: Received: 10 May 2025; Received in revised form: 06 Jun 2025; Accepted: 12 Jun 2025; Available online: 18 Jun 2025
In this paper, the effect of thermal treatment of (Ti-49Al & Ti-51Al) alloys on corrosion behavior in 0.01M of H2SO4, H3PO4, HNO3 and HCl solutions was investigated. Potentiodynamic polarization measurements, were performed for the two alloys in 0.01 M acidic media at room temperature. The polarization curves indicated three regions. The first region, the active dissolution region was observed from – 2000 to ~ - 700 mV(SCE), the second region, signifying the transition from active dissolution to a passive state on the electrode surface and the third region, a trans-passive region, which the oxygen started to evolve and the current density increased sharply with further increase in potential. The results of potentiodynamic polarization curves, clearly indicate that the corrosion resistance for different alloys decreases as follows: a < f < e < d < b < c, this means that alloys (a, f and e), which have one phase structure ( 100 % γ), shows better corrosion resistance than alloys (d, b and c), which have dual phase structure (α + γ). The surface morphology was examined by scanning electron microscope (SEM) and energy dispersive X-ray analysis (EDX) of two alloys used to confirm the corrosion mechanism. The SEM results confirmed the corrosion of Ti-Al alloys due to uniform corrosion in 0.01 M HCl solution.
