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The region of passive/active state of pure titanium in aerated and deaerated dilute HCl solutions was determined and hydrogen absorption of titanium in the passive region was investigated. The results obtained are as follows. (1) The passive region of titanium was wider in the aerated HCl solutions than in the deaerated solutions. (2) In the aerated HCl solutions, titanium scarcely absorbed hydrogen at the whole temperature range of 70C to 250C. (3) In the deaerated HCl solutions, hydrogen absorption of titanium increased with increasing acidity and temperature of solution but did not increase over 200C.

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