通过扫描镜（ＳＥＭ）对ＬＮ２０９井油管的沉积物进行观察，发现主要有三层沉积物方腐蚀行为靠近金属基体的较为致密，另外两层为疏松状的物质，通过双速流动实验装置和电偶腐蚀速度测量仪研究了ＬＮ２０９井油管的沉积物下方的腐蚀规律。
The deposit on LN209 oil tube was observed by scanning electron microscope (SEMI and was found to have three layers. The layer close to the metal matrix was more dence than the other two layers. Underdeposit corrosion of LN209 oi'l tube was studied by a home made dynamic loop test system with dual speeds and corrosion rate measuring probe. The results showed that when the underdeposit specimen connected with the exposed metal, the former acted as an anodic electrode. The underdeposit corrosion increased with the sur- face area of exposed metal. When the area ratio of the exposed to the deposited specimen is above 4,the corrosion rate was stable. The underdeposit corrosion increased with the flow velocity.
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