Effect of AC Current Density on the Stress Corrosion Cracking Behavior and Mechanism of E690 High-Strength Steel in Simulated Seawater

Journal Article · Fri Nov 15 04:00:00 EST 2019 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-019-04405-4· OSTI ID:22970352

Pan, Yue; Liu, Zhiyong; Zhang, Yadan; Li, Xiaogang; Du, Cuiwei ^[1]

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1. University of Science and Technology Beijing, Corrosion and Protection Center (China)

In this work, we studied the impact of alternating current (AC) density on the stress corrosion cracking (SCC) behavior and mechanism of E690 high-strength steel in simulated seawater with electrochemical measurements, U-bend immersion tests and slow strain rate tensile tests. Results demonstrate that AC enhances both anodic and cathodic processes, especially localized anodic dissolution and hydrogen evolution, which manifests as the increase in i{sub corr} with AC current density rising. Therefore, AC leads to higher SCC susceptibility. Accordingly, SCC is dominated by anodic dissolution (AD) at low AC current density while in a mixed control of AD and hydrogen embrittlement (HE) at high AC current density as a result of increasing hydrogen concentration. Besides, 50 A/m{sup 2} corresponds to the threshold hydrogen concentration of the “hydrogen-induced plasticity to HE” transformation, which is due to the different interactions of dislocation and hydrogen.

• OSTI ID: 22970352
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 11 Vol. 28; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALTERNATING CURRENT
CRACKING
CURRENT DENSITY
ELECTROCHEMISTRY
HYDROGEN EMBRITTLEMENT
HYDROGEN PRODUCTION
PLASTICITY
SEAWATER
SIMULATION
STEELS
STRAIN RATE
STRESS CORROSION