The role of hydrogen in stress-corrosion cracking of austenitic stainless steel in hot MgCl2 solution |
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| Authors: | L Qiao X Mao W Chu |
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| Affiliation: | (1) Department of Mechanical Engineering, The University of Calgary, T2N 1N4, Calgary, AB, Canada;(2) Department of Materials Physics, University of Science and Technology Beijing, 100083 Beijing, P.R. China |
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| Abstract: | The role of hydrogen in stress-corrosion cracking (SCC) of austenitic stainless steel was investigated in boiling chloride
solution. The tests in the mixed melted salt verified that hydrogen-induced cracking (HIC) could occur at 160 °C if sufficient
hydrogen could be supplied continuously. It was found that the threshold SCC intensity factors of both 321 and 310 steels
were lower than those of HIC during dynamic charging at high fugacity at 40 °C and 160 °C. In addition, anodic polarization
decreased hydrogen concentration and promoted SCC in hot LiCl solution, while cathodic polarization increased hydrogen concentration
and restrained SCC. Hydrogen could be introduced into the specimen and be concentrated at the crack tip during SCC. It could
promote anodic dissolution and SCC remarkably, although it was not enough to produce cracking. |
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