Stress Corrosion Cracking of X80 Steel in the Presence of Sulfate-reducing Bacteria

doi:10.1016/j.jmst.2014.08.012

Abstract

Abstract: The systematic laboratory studies on the roles of sulfate-reducing bacteria (SRB) in the stress corrosion cracking (SCC) susceptibility of X80 steel subjected to cathodic potential have been conducted in a near-neutral pH soil solution by slow strain rate tests. The cathodic potential and SRB increase individually the SCC susceptibility of the steel in the soil solution. The positive role of the SRB activities in SCC susceptibility depends on the prolongation of pre-incubation time, and the SCC susceptibility of the steel increases under more negative potentials. What's more, the applied potentials and the presence of SRB work together in promoting the SCC susceptibility of the steel. But, the combined action becomes limited with decreasing cathodic potentials. The relationships between the plasticity loss and the permeable hydrogen concentration were established for the steel in the soil solution, regardless of under open circuit potential or cathodic potentials, in both the sterile and SRB inoculated conditions. The relationships are practically significant for the selection of safe cathodic protection (CP) potentials in the presence of SRB in soil environment.

Key words: Carbon steel, Microbiologically influenced corrosion (MIC), Stress corrosion cracking (SCC)

Tangqing Wu, Maocheng Yan, Dechun Zeng, Jin Xu, Cheng Sun, Changkun Yu, Wei Ke. Stress Corrosion Cracking of X80 Steel in the Presence of Sulfate-reducing Bacteria[J]. J. Mater. Sci. Technol., 2015, 31(4): 413-422.

Figures/Tables 15

Microstructure of X80 pipeline steel.

Schematic diagram of the tensile specimen used in this experiment.

Stress-strain curves of the steel subjected to SSRT in the sterile soil solution and the inoculated soil solutions pre-incubated for different time.

RA and tF of X80 steel samples in the sterile soil solution and the inoculated soil solutions after different pre-incubation time.

SRB number in the inoculated soil solution (with 5% API RP-38 medium) after the different pre-inoculation time.

Surface fracture morphology of X80 steel (a, b) in the sterile soil solution and the inoculated soil solutions after different incubation time: (c, d) 0 d

(e, f) 3 d

(g, h) 5 d

(i, j) 10 d

(k, l) 20 d.

Stress-strain curves of the steel subjected to SSRT in air and the sterile soil solution under different cathodic potential.

RA and tF of X80 steel samples in air and the sterile soil solution under different cathodic potential.

Surface fracture morphology of X80 steel (a, b) in air and the sterile soil solution under different cathodic potential: (c, d) -876 mV

(e, f) -976 mV

(g, h) -1176 mV.

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