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A study was made of the effect of addition of NO3ions on the corrosion of titanium in HCl solutions. For titanium, NO3ions was necessary to add at least 0.008kmol m-3 (0.05 mass%) to achieve corrosion inhibition in HCl solutions. Above this concentration, titanium passivates, and hydrogen pick up by titanium was also prevented. Ti3+ ions near surface seem to be quickly oxidized by NO2 formed with other products in the reduction of NO3to Ti4+ in the reaction Ti3++NO2-Ti4++NO2-. As a result, titanium passivates and corrosion inhibition of titanium is achieved.

Effect of NO-3 on the corrosion rate of titanium in HCl solutions

Effect of NO^-₃ on the corrosion rate of titanium in HCl solutions