Abstract
Dual-phase Ti–30Zr–5Al–3V alloy was subjected to hot deformation to investigate its effect on microstructure, corrosion resistance, and pitting behavior in acid corrosive medium by assessing the electrochemical behavior, immersion corrosion phenomenon, and passive film characteristics of alloys of different states. The hot deformation and water quenching process does not significantly change the concentration of α and β phases but significantly refines the microstructure, which reduces the compositional differences and, consequently, the galvanic corrosion strength between them, which is beneficial to the corrosion resistance. In addition, refinement increases the relative content of high-valent oxide and the thickness of the passive film, which reduce the concentration of oxygen vacancy, thereby decreasing the transfer rate of cation vacancies. Simultaneously, fewer oxygen vacancies also inhibit the formation of cation–anion-vacancy associations at the metal/film interface. Therefore, the pitting resistance is also improved.
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