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<p>This study develops Ca- and Cu-alloyed Mg–Al sacrificial materials to address N80 steel corrosion in petroleum extraction, providing theoretical and experimental guidance for protective coating design. Scanning electron microscopy (SEM), X-ray diffraction (XRD), and electrochemical tests reveal that adding 4% Ca forms a networked Mg₂Ca phase, while 4% Cu generates a flocculent MgAlCu phase. Together, they coexist synergistically, greatly enhancing electron release. The mechanism relies on corrosion micro-batteries between the second phases and Mg matrix, which continuously supply electrons. Adsorption of these electrons on N80 steel suppresses anodic dissolution, shifting corrosion potential positively and lowering current. The Mg–Al-4Cu-4Ca alloy shows optimal performance, with a charge transfer resistance (Rct) of 2946 Ω·cm<sup>2</sup>, confirming the synergistic effect. By tailoring Ca and Cu contents, second-phase morphology and distribution can be optimized to build efficient electron supply systems, offering durable, eco-friendly Mg–Al coatings for oilfield pipelines and chemical equipment.</p>

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The Impact of Corrosion Micro-Cells on the Corrosion Behavior of N80 Steel

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Ziyang Zhang,
  • Zhou Fan,
  • Rongtao Zhu,
  • Can Peng,
  • Liang Zhang,
  • Qinghui Zhang,
  • Chengchen Hu,
  • Manni Li,
  • Yong Tao,
  • Qiuxia Chen

摘要

This study develops Ca- and Cu-alloyed Mg–Al sacrificial materials to address N80 steel corrosion in petroleum extraction, providing theoretical and experimental guidance for protective coating design. Scanning electron microscopy (SEM), X-ray diffraction (XRD), and electrochemical tests reveal that adding 4% Ca forms a networked Mg₂Ca phase, while 4% Cu generates a flocculent MgAlCu phase. Together, they coexist synergistically, greatly enhancing electron release. The mechanism relies on corrosion micro-batteries between the second phases and Mg matrix, which continuously supply electrons. Adsorption of these electrons on N80 steel suppresses anodic dissolution, shifting corrosion potential positively and lowering current. The Mg–Al-4Cu-4Ca alloy shows optimal performance, with a charge transfer resistance (Rct) of 2946 Ω·cm2, confirming the synergistic effect. By tailoring Ca and Cu contents, second-phase morphology and distribution can be optimized to build efficient electron supply systems, offering durable, eco-friendly Mg–Al coatings for oilfield pipelines and chemical equipment.