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| Relations between Hydrogen-induced Cracking and Anode Dissolution of Pipeline Steel X70 in Near-neutral Environment |
| 北京科技大学 |
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Abstract Stress corrosion cracking (SCC) mechanism of pipeline steel X70 has been investigated in a solution of near-neutral pH by means of slow strain rate test and electrochemical test technology. The experiments showed that SCC susceptibility increased as the applied potential shifted in the cathodic direction, but when the potential was lower than the extent of susceptive potential, SCC susceptibility depressed. Besides, the susceptive potential became more negative as the pH value decreased and corrosion rate increased. The analysis showed that hydrogen-induced cracking together with anode dissolution played an important role in the SCC of pipeline steel X70. However, anode dissolution and hydrogen-induced cracking did not work separately. Hydrogen permeation was related to the process of hydrogen deoxidization and the anode dissolution at specimen surface. Relevant potential was able to make the two mechanisms combined to cause much more serious SCC.
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Received: 12 September 2006
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