Corrosion behavior of oil tube steel in simulant solution with hydrogen sulfide and carbon dioxide
Corrosion behavior of oil tube steel in simulant solution with hydrogen sulfide and carbon dioxide
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DOI：
10.1016/j.matchemphys.2005.03.010
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发表时间：
2005-10
影响因子：
4.6
通讯作者：
C. Ren;Daoxin Liu;Z. Bai;Tie-hu Li
中科院分区：
文献类型：
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作者：
C. Ren;Daoxin Liu;Z. Bai;Tie-hu Li
采用电化学测试技术、X射线衍射仪和扫描电子显微镜研究了N80管钢在100℃、含二氧化碳(CO2)和硫化氢(H_2S)的模拟静态溶液中的腐蚀行为。在此条件下，发现了均匀的腐蚀。硫化氢的加入只会加速总的腐蚀速度。当硫化氢分压增加到0.010 Mpa时，腐蚀以酸腐蚀为主。总腐蚀速度迅速下降，但出现了严重的点蚀现象。腐蚀产物膜疏松脆性，主要由马基纳威石(FeS_1-−_x)粗大颗粒组成。在酸性腐蚀中，随着H_2S分压的增加，腐蚀速率下降缓慢，点蚀变小，主要腐蚀产物是细小的磁黄铁矿(FeS_1+x)，使氧化膜更加致密和连续。
Electrochemical measurement techniques, X-ray diffraction and scanning electron microscopy were applied to investigate the corrosion behavior of N80 tube steel in simulant static solution with carbon dioxide (CO2) and hydrogen sulfide (H2S) at a temperature of 100°C. Sweet corrosion occurred when a very small partial pressure of H2S was added. At this condition, uniform corrosion was found. The added H2S only accelerated the general corrosion rate. Sour corrosion was primary as the partial pressure of H2S increased to 0.010MPa. The general corrosion rate decreased quickly, but severe pitting was found. The corrosion scale, mainly composed of coarse grains of mackinawite (FeS1−x), was loose and brittle. In sour corrosion, general corrosion rate decreased slowly and pitting became slight with increasing partial pressure of H2S because the primary corrosion product, fine grains of pyrrhotite (FeS1+x), made the scale more compact and continuous.