海洋软管铠装层用钢的海水腐蚀行为

通过浸泡实验研究了铠装层用钢在模拟海水环境下的腐蚀行为.实验结果表明,实验钢的微观组织由回火马氏体组成,同时在基体中观察到含铬的析出粒子;腐蚀速率随着腐蚀时间延长逐渐降低,最终实验腐蚀速率为0.068 9 mm·a~(-1).腐蚀行为分为三个阶段:快速下降阶段、平稳过渡阶段和缓慢下降阶段,试样表面的腐蚀产物主要为α-FeOOH,γ-FeOOH,Fe_3O_4,Fe_2O_3;随着腐蚀时间的增加,腐蚀产物结构更加密实且厚度更大,铬元素倾向于在腐蚀产物中聚集.

Corrosion Behavior of Armor Layer Steel of Flexible Pipes Exposed to Seawater Environment

Immersion experiment was carried out to investigate the corrosion behavior of armor layer steel immersed in a simulated seawater environment. The experimental results demonstrate that the microstructure of the designed steel is made of tempered martensite. Meanwhile， Cr-rich precipitated particles are observed in the substrate of the steel. Corrosion rate decreases with prolonging corrosion time， and the final corrosion rate is 0.0689mm·a^-1. The corrosion behavior can be divided into three stages: the fast decreasing stage， stable transitional stage and slow decreasing stage. The major corrosion products are α-FeOOH， γ-FeOOH， Fe₃O₄， and Fe₂O₃. With increasing corrosion time， the structure of corrosion products becomes more compact and their thickness is wider. Chromium element tends to accumulate in the corrosion products.