Influence of Applied Potential on Stress Corrosion Cracking of X80 Steel in Manchurian Soil

doi:10.11885/j.issn.1674-5086.2018.10.12.02

Abstract

Abstract: Stress corrosion cracking (SCC) of X80 pipeline steel (X80 steel) in a simulated Manchurian soil solution was studied, with the aim of providing data to support the design of methods to prevent SCC in X80 steel used for manufacturing buried pipelines. By means of an AC impedance technique, a potentiodynamic polarization technique, and slow strain rate tensile tests, the SCC behavior of X80 steel in simulated Manchurian soil solution was investigated under different applied potentials, and the microscopic morphologies of the fracture surfaces were observed using a scanning electron microscope. The results indicated that the self-corrosion potential led to the initiation of cracks at corrosion pits in X80 steel, with anodic dissolution (AD) being the mechanism underlying SCC. Applied potentials of -850 mV and -930 mV provided inhibitory effects against SCC in X80 steel, and reduced sensitivity to SCC; in particular, -850 mV was determined to be the optimal cathodic protection potential. Under these two potentials, SCC in X80 steel occurred via a combination of AD and hydrogen-induced cracking (HIC), with HIC being the dominant mechanism of SCC under the applied potential of -930 mV. Under applied potentials of -1 000 mV and -1 200 mV, X80 steel exhibited higher sensitivity to SCC, with SCC occurring via HIC through the synergistic effects of hydrogen and stress.

Key words: X80 steel, applied potential, slow strain rate tensile test, stress corrosion cracking, soil environment

CLC Number:

ZHANG Wenjian, ZHU Zongxiang, XIAO Peng, CHEN Yuzhong, DONG Shuai. Influence of Applied Potential on Stress Corrosion Cracking of X80 Steel in Manchurian Soil[J]. 西南石油大学学报(自然科学版), 2019, 41(5): 181-188.

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