Abstract Corrosion product layers formed on mild steel coupons after 6 years of permanent immersion at shallow depth in marine sediments were characterized by X-ray diffraction and μ-Raman spectroscopy. They proved mainly composed of FeS which testifies for an intense sulfate-reducing bacteria activity. Other identified compounds were siderite FeCO3 and four varieties of green rust associated with local variations of composition of the environment. The corrosion rates determined by residual thickness measurements were higher on the lower half of the coupons (average 40 μm/yr, local maximum 140 μm/yr) and smaller on the upper half, suggesting that differential aeration effects took place.

中文翻译：

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海水/沉积物界面的低碳钢腐蚀：机理和动力学

摘要 通过 X 射线衍射和 μ-拉曼光谱对低碳钢试样在浅层海洋沉积物中永久浸泡 6 年后形成的腐蚀产物层进行了表征。他们证明主要由 FeS 组成，这证明了强烈的硫酸盐还原细菌活性。其他确定的化合物是菱铁矿 FeCO3 和四种与环境成分局部变化相关的绿锈。通过残余厚度测量确定的腐蚀速率在试样的下半部分较高（平均 40 微米/年，局部最大值 140 微米/年）而在上半部分较小，表明发生了不同的曝气效应。