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<p>Corrosion behavior of two X70 pipeline steels with the same chemical composition but different thermomechanical processing parameters was evaluated in strong acidic (pH = 1.1) and mild acidic media (pH = 2.6). The corrosion test was performed using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques. Microstructural characterization of steels was done by scanning electron microscope (SEM), electron backscattered diffraction (EBSD), and x-ray diffraction (XRD). The results indicate that the corrosion rate is higher in mild acidic media in contrast to strong acidic media because the protective surface layer formation of both X70 steels takes place in the strong acidic media. These protective layers were facilitated by higher grain boundary density and stored energy, which could act as favorable nucleation sites for corrosion products that inhibit further dissolution. Furthermore, the electrochemical corrosion rate was governed by the competition between metal dissolution and the formation of these protective layers. X70-2 steel plate with fine ferrite grain size, higher M/A fraction, high KAM, higher deformed fraction, high GNB density, low ∑3 CSLB density, high RHGB density, and overall higher stored energy in texture fiber leads to higher corrosion rate. X70-1 with a relatively higher γ-fiber fraction and lower ζ-fiber fraction in the steel exhibited superior corrosion resistance in both strong acidic and mild acidic media. Corrosion product analysis demonstrated that FeS is the primary product in the strong acidic medium, while a small amount of FeOOH is present in the mild acidic media. The microstructural characteristics contribution to the corrosion rate was less pronounced in the strong acidic medium than in the mild acidic medium. Steel with a lower cooling rate, lower rolling reduction, and higher coiling temperature has lower corrosion susceptibility in both media.</p>

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Role of Microstructure, Crystallographic Texture, and Different Acidic Environments on the Electrochemical Corrosion of X70 Pipeline Steels

  • 期刊论文

  • 发表日期：

    2025年9月29日

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  • Sandeep Yadav,
  • Jhon Freddy Aceros Cabezas,
  • Alok Kumar Singh,
  • Reza Khatib Zadeh Davani,
  • Jerzy Szpunar

摘要

Corrosion behavior of two X70 pipeline steels with the same chemical composition but different thermomechanical processing parameters was evaluated in strong acidic (pH = 1.1) and mild acidic media (pH = 2.6). The corrosion test was performed using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques. Microstructural characterization of steels was done by scanning electron microscope (SEM), electron backscattered diffraction (EBSD), and x-ray diffraction (XRD). The results indicate that the corrosion rate is higher in mild acidic media in contrast to strong acidic media because the protective surface layer formation of both X70 steels takes place in the strong acidic media. These protective layers were facilitated by higher grain boundary density and stored energy, which could act as favorable nucleation sites for corrosion products that inhibit further dissolution. Furthermore, the electrochemical corrosion rate was governed by the competition between metal dissolution and the formation of these protective layers. X70-2 steel plate with fine ferrite grain size, higher M/A fraction, high KAM, higher deformed fraction, high GNB density, low ∑3 CSLB density, high RHGB density, and overall higher stored energy in texture fiber leads to higher corrosion rate. X70-1 with a relatively higher γ-fiber fraction and lower ζ-fiber fraction in the steel exhibited superior corrosion resistance in both strong acidic and mild acidic media. Corrosion product analysis demonstrated that FeS is the primary product in the strong acidic medium, while a small amount of FeOOH is present in the mild acidic media. The microstructural characteristics contribution to the corrosion rate was less pronounced in the strong acidic medium than in the mild acidic medium. Steel with a lower cooling rate, lower rolling reduction, and higher coiling temperature has lower corrosion susceptibility in both media.