Formation of $T{i}_2{O}_3$ and $Ti{O}_2$ on the surface of $TI$ provides much of the corrosion protection. With this in mind, what is the predicted stable phase if the pH of a solution is measured to be $2\mathrm{.}0$ and and at a potential of $-1\mathrm{.}5Vvs$ SCE and the pH is increased to $9$ at $25C.$

Pick the best answer by consulting the Pourbaix diagram below.

Fig. $6\mathrm{.}15$ Pourbaix diagram for titanium at $25C.$ Drawn from data in $[1]$

$N{O}_2$ or $H_2{O}_3$ passive

$N^2$

$r^{t^2}$ corrosion

$10$

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