高含硫天然气埋地管道冲刷腐蚀特性研究

Characterization of Scour Corrosion of Buried Natural Gas Pipeline With High Sulfur Content

合成了2种苯二氮卓衍生物的有机缓蚀剂,分别为BS和BT。通过标准电化学和重量法深入研究了这2种有机缓蚀剂在硫化氢模拟酸中对含硫天然气低碳钢(MS)管道的防腐蚀性能。同时,采用紫外可见光谱对钢材表面和腐蚀溶液进行了分析。结果表明:2种有机化合物在酸性介质中都表现出良好的低碳钢腐蚀缓蚀效果,并且属于混合型缓蚀剂。热力学参数揭示,2种化合物以Langmuir吸附等温线的方式吸附在金属表面。紫外可见光谱结果显示,添加这2种化合物降低了腐蚀溶液中铁离子的溶解,并在钢表面形成了一层保护性膜。

Two organic corrosion inhibitors of benzodiazepine derivatives,BS and BT,were synthesized.The corrosion protection properties of these two organic compounds against sulfur-containing natural gas mild steel(MS)pipelines in hydrogen sulfide simulated acid were thoroughly investigated by standard electrochemical and gravimetric methods.Meanwhile,the steel surface and corrosion solution were analyzed by UV-visible spectroscopy.The experimental results showed that both organic compounds exhibited good mild steel corrosion inhibition in acidic media and were hybrid inhibitors.Thermodynamic parameters revealed that both compounds adsorbed on the metal surface in a Langmuir adsorption isotherm.UV-visible spectroscopy results showed that the addition of these two compounds reduced the dissolution of iron ions in the corrosion solution and formed a protective film on the steel surface.