ABSTRACT

The effect of hydrostatic pressure (HP) on the corrosion behaviour of X80 steel is investigated to assist the development of deep-sea oil and gas resources. The results show that the corrosion current increases as HP increases whereas the charge transfer resistance follows the opposite trend. The corrosion products are composed of γ-FeOOH, α-Fe₂O₃ and α-FeOOH at atmospheric pressure, while Fe₃O₄ is only formed at a high HP. Additionally, the inner layer of the corrosion products contains more Fe₃O₄ compared with the surface corrosion layer. HP accelerates the corrosion rate of X80 steel due to its effect on the chemical and physical properties of the corrosion products, including the promoted reduction of γ-FeOOH and the formation of wider and deeper cracks on the corrosion product layer.

摘要

研究静水压力 (HP) 对 X80 钢腐蚀行为的影响，以帮助开发深海油气资源。结果表明，腐蚀电流随着 HP 的增加而增加，而电荷转移电阻则相反。常压下腐蚀产物由γ -FeOOH、α -Fe ₂ O ₃和α -FeOOH组成，而Fe ₃ O ₄仅在高HP条件下形成。此外，腐蚀产物的内层含有较多的 Fe ₃ O ₄与表面腐蚀层相比。HP 会加速 X80 钢的腐蚀速率，因为它对腐蚀产物的化学和物理性质有影响，包括促进γ -FeOOH 的还原以及在腐蚀产物层上形成更宽更深的裂纹。