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Corrosion behavior of mechanical clad pipe welded joints in CO2-saturated seawater under high temperature and high pressure

Authors

  • F. Xue,

    1. Department of Materials Science and Engineering, Tsinghua University, Beijing 100084 (P. R. China)
    2. Suzhou Nuclear Power Research Institute, Suzhou 215004 (P. R. China)
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  • L. Y. Xu,

    1. School of Materials Science and Engineering, Tianjin University, Tianjin 300072 (P. R. China)
    2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300072 (P. R. China)
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  • H. Y. Jing,

    1. School of Materials Science and Engineering, Tianjin University, Tianjin 300072 (P. R. China)
    2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300072 (P. R. China)
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  • Y. D. Han

    Corresponding author
    1. School of Materials Science and Engineering, Tianjin University, Tianjin 300072 (P. R. China)
    2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300072 (P. R. China)
    • School of Materials Science and Engineering, Tianjin University, Tianjin 300072 (P. R. China).
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Abstract

In the present study, a new welding procedure was developed according to the welding difficulties of mechanical clad pipe. The effect of temperature on the corrosion product layer of stainless steel welded joints exposed to a CO2-containing solution was investigated. The measurement techniques, such as scanning electron microscopy with energy dispersive spectrometry, X-ray diffraction, and X-ray photoelectron spectroscopy, were used to systematically characterize the morphology and composition of the corrosion product layer. The corrosion rates were calculated by weight loss method. The corrosion mechanisms are studied and discussed. The results showed that temperature is an important factor in the corrosion rate of mechanical clad pipe welded joints.

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