Abstract
Hydrogen accumulated in eutectoid steels with different heat treatments was measured using electrochemical method. This method pulled out about 30% lesser amount of hydrogen than that determined by thermal desorption method. Hydrogen content in steels accumulated during single corrosion cycle was about 0.01 to 0.1 ppm and they depended on microstructure of steels. Hydrogen content in different microstructure of steels decreased in the order of: Martensite > pearlite > spheroidized cementite-ferrite. The amount of hydrogen accumulated during several continuous corrosion cycles was larger than that observed in single cycle, and the difference of hydrogen content between microstructures became also lager.
