Stress corrosion behavior of X80 dual-phase pipeline steel under applied potential in simulated coastal soil environment

doi:10.13251/j.issn.0254-6051.2023.02.005

Abstract

Abstract: Stress corrosion behavior of X80 dual-phase pipeline steel in the simulated coastal soil environment under different applied potentials was studied by AC impedance spectroscopy, polarization test and slow strain rate tensile test. The tensile fracture and polarized specimens were analyzed by SEM and EDS. The results show that the self-corrosion potential of the X80 dual-phase pipeline steel by fast scanning polarization (simulated crack tip) is more negative and the corrosion current is higher than that of polarization at slow scanning rate (simulated non-crack tip area). Applied cathode potential of -750 mV is right about the self-corrosion potential of crack tip, which is not negative enough to play the role of cathodic protection, so that it is still very sensitive to stress corrosion. When the applied potential is -1050 mV, the cathode reaction rate is significantly higher than that of anode reaction, the hydrogen generated by cathode reaction is absorbed and diffuses in the steel, thus the slow strain tensile specimen breaks without necking, with the fracture being quasi cleavage. When the applied cathode potential is -900 mV, the cathode current effectively inhibits the anodic dissolution reaction, and the slow strain tensile strength and the percentage reduction of area of the X80 pipeline steel in coastal soil solution are the highest, the fracture is characterized by ductile fracture, small side cracks, the largest impedance modulus. Therefore the stress corrosion sensitivity of the X80 dual-phase pipeline steel under -900 mV cathodic potential is the smallest.

Key words: X80 pipeline steel, stress corrosion, simulated coastal soil environment, applied potential

CLC Number:

TG172

Ma Jing, Luo Hong, Wang Shenhao, Tong Anqi, Li Jianhui, Wang Jiangang, Feng Zhihao, Chen Yiqing. Stress corrosion behavior of X80 dual-phase pipeline steel under applied potential in simulated coastal soil environment[J]. Heat Treatment of Metals, 2023, 48(2): 30-35.

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