Effect of Applied Potentials on Stress Corrosin Cracking of X70 Pipeline Steel in Near-Neutral-pH Solutions

J Chin Soc Corr Pro

2004, Vol. 24

Issue (4): 208-212 DOI:

Research Report

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Effect of Applied Potentials on Stress Corrosin Cracking of X70 Pipeline Steel in Near-Neutral-pH Solutions

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Abstract The stress corrosion cracking(SCC) behaviior of X70pipeline steel in near-neutral-pH solutions at different applied potentials and the effect of different levels of CO2 on SCC were studied with slow strain rate testing (SSRT). The results showed that the cracking mode of X70pipeline steel in near-neutral-pH solutions was transgranular, with the features of quasi-cleavage. The susceptibilit to SCC increased as the applied potential moved towards the cathodic direction The value of pH decreased with the increased addition of CO2 in the solution, which increased the susceptibitlity to SCC. Hydroge induced cracking(HIC) dominated the process.

Key words: pipeling steel stress corrosion cracking near-neutral pH potential carbon dioxide

Received: 12 May 2003

ZTFLH:

TG172.8

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. Effect of Applied Potentials on Stress Corrosin Cracking of X70 Pipeline Steel in Near-Neutral-pH Solutions. J Chin Soc Corr Pro, 2004, 24(4): 208-212 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2004/V24/I4/208

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