TY - JOUR
T1 - Effects of moisture and dissolved oxygen in methanol and ethanol solutions containing hydrochloric acid on hydrogen absorption and desorption behaviors of Ni-Ti superelastic alloy
AU - Ogawa, Toshio
AU - Yokoyama, Ken'ichi
AU - Asaoka, Kenzo
AU - Sakai, Jun'ichi
PY - 2006/4/25
Y1 - 2006/4/25
N2 - The effects of moisture (H2O concentration) and dissolved oxygen in methanol and ethanol solutions containing 0.1% hydrochloric acid (HCl) on hydrogen absorption and desorption behaviors of the Ni-Ti superelastic alloy have been examined by hydrogen thermal desorption analysis. In the methanol solution, the amount of absorbed hydrogen decreases with increasing H2O concentration. For 5% H2O, the thermal desorption peak of hydrogen gradually shifts from 400 to 250 °C with immersion time. When the H2O concentration is higher than 10%, the hydrogen absorption is not observed. Under a deaerated condition, significant dissolution of the specimen due to corrosion is observed; however, the increment in the amount of desorbed hydrogen is not observed. In the ethanol solution, the critical H2O concentration for hydrogen absorption is approximately 0.8%. For 2% H2O, the hydrogen absorption is not exhibited, although slight corrosion is observed. The amount of absorbed hydrogen under the deaerated condition is ten times more than that under the aerated condition. The dissolved oxygen varies the hydrogen desorption behavior.
AB - The effects of moisture (H2O concentration) and dissolved oxygen in methanol and ethanol solutions containing 0.1% hydrochloric acid (HCl) on hydrogen absorption and desorption behaviors of the Ni-Ti superelastic alloy have been examined by hydrogen thermal desorption analysis. In the methanol solution, the amount of absorbed hydrogen decreases with increasing H2O concentration. For 5% H2O, the thermal desorption peak of hydrogen gradually shifts from 400 to 250 °C with immersion time. When the H2O concentration is higher than 10%, the hydrogen absorption is not observed. Under a deaerated condition, significant dissolution of the specimen due to corrosion is observed; however, the increment in the amount of desorbed hydrogen is not observed. In the ethanol solution, the critical H2O concentration for hydrogen absorption is approximately 0.8%. For 2% H2O, the hydrogen absorption is not exhibited, although slight corrosion is observed. The amount of absorbed hydrogen under the deaerated condition is ten times more than that under the aerated condition. The dissolved oxygen varies the hydrogen desorption behavior.
KW - Corrosion
KW - Ethanol solution
KW - Hydrogen embrittlement
KW - Methanol solution
KW - Ni-Ti
UR - http://www.scopus.com/inward/record.url?scp=33645899303&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33645899303&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2006.02.005
DO - 10.1016/j.msea.2006.02.005
M3 - Article
AN - SCOPUS:33645899303
SN - 0921-5093
VL - 422
SP - 218
EP - 226
JO - Materials Science and Engineering A
JF - Materials Science and Engineering A
IS - 1-2
ER -