In the oxidizing solution, boiling 65% HNO3, any impurity element has no effect on the corrosion rate.In the non-oxidizing acid solutions where titanium is actively corroded, the corrosion rates are increased by the presence of more than 0.15% Fe in the boiling 1% H2SO4 and 0.03% Fe in the boiling 5%HCl, while the presence of Si, C, and N decrease the corrosion rates slightly and O has no effect.When titanium is subjected to the heat cycle simulated to that of heat affected zone in welding, the presence of more than 0.05% Fe increases the corrosion rate in the boiling 1% H2SO4 solution, whereas Fe exerts no effect in the oxidizing solution.

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