Abstract
The role of hydrogen and anodic dissolution in stress corrosion cracking (SCC) of API X-60 pipeline steel in soil containing water has been studied. The results show that the relative elongation reduction induced by hydrogen, IHE, increases linearly with increases in the logarithm of hydrogen concentration, CH, i.e., IHE(%) = 27.9 + 11.5 lnCH(wppm). Hydrogen can enter the sample during SCC in soil containing water at open circuit and cathodic polarization. Therefore, the relative elongation reduction during SCC, ISCC, is the sum of ISCC(H), ISCC(AD), and ISCC(HAD), i.e., ISCC = ISCC(H) + ISCC(AD) + ISCC(HAD), where ISCC(H) is the relative elongation reduction induced by the hydrogen that entered the sample during SCC, ISCC(AD) is that induced by the anodic process during SCC, and ISCC(HAD) is that caused by the coupling of hydrogen and the anodic process in a hydrogen-enhanced anodic process. For SCC at open circuit, there is no hydrogen-enhanced anodic dissolution, and ISCC = ISCC(H) + ISCC(AD). Experiments showed that ISCC(H) ≈ ISCC(AD), indicating that hydrogen and anodic dissolution play almost equally important roles during SCC of pipeline steel in soil containing water at open circuit.
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