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Recently, steels with extremely high strength have been developed and used where energy-saving, environmental protection, and so on are desired. The strength of the recently developed steel has exceeded 2 000 MPa. However, some of the high-strength steels suffer fracture when employed in humid conditions for a relatively long time, so called delayed fracture.1) Therefore, there is an urgent need to clarify the cause of such failure and find possible solutions. Relevant studies have proven that the delayed fracture is caused by hydrogen embrittlement (HE),2) in which atmospheric corrosion induces the generation of hydrogen atoms on the steel, which are absorbed and spread the steel, resulting in HE,. Steel whose 0.2% yield strength is higher than 1 200 MPa is susceptible to HE,3) whereas a smaller concentration of hydrogen causes HE in steel with higher strength.4) Most of the studies on HE so far was focused on the Effect of Humidity of Air on Hydrogen Absorption into Fe with Rust Layer Containing MgCl2 during Atmospheric Corrosion

Effect of Humidity of Air on Hydrogen Absorption into Fe with Rust Layer Containing MgCl<sub>2</sub> during Atmospheric Corrosion