湿硫磺颗粒的腐蚀行为及材质选择

实验通过试片悬挂转动的方法来模拟现场水造粒硫磺成型过程,采用失重腐蚀速率、扫描电镜观察,能谱进行表征,研究了温度、位置因素对316L和20#钢在水造粒硫磺颗粒成型过程中的腐蚀规律特征。实验分析结果表明:316L在水造粒硫磺颗粒成型过程中抗腐蚀性能良好,失重腐蚀速率介于0.000 8 mm/a和0.007 0 mm/a之间。材质表面腐蚀产物较少,主要为氧化铁。20#钢在整个过程中腐蚀严重,失重腐蚀速率远远超出了含硫气田腐蚀控制标准0.075 mm/a,试片表面至少形成两层腐蚀产物膜,主要为氧化铁和硫化亚铁,高温和冲刷会加快腐蚀速率。通过模拟实验结果建议在现场硫磺颗粒成型过程中316L材质可长期使用,对使用20#钢的设备管线应尽早更换,并定期进行监测,确保生产装置的安全。

The Wet Sulfur Particles Corrosion Behavior and Material Selection

In this paper, the method rotating the suspended metal samples were used to simulate water granulation sulfur solidification process. In the experiment, the corrosion rules of 316L and 20# Steel due to the change of temperature and position were researched. Corrosion weight loss, Scanning electron microscopy,Energy dispersive spectrometer were used to find the corrosion rules. The experiment results show that: 316L was slightly corroded and the corrosion rate was between 0.0008mm/a and 0.0070mm/a. The corrosion products on the surface of the material were little, and the main component is Fe2O3. 20# Steel was severely corroded in the process and the weight loss corrosion rate far beyond the sour gas field corrosion control standard 0.075mm/a. At least two membranes of corrosion products were formed at the surface of metal samples, and the main components are Fe2O3 and FeS. High temperature and erosion will accelerate the corrosion rate. The simulation results show that when it comes to the granulation of sulfur particles in the industrial field, 316L can be applied for long period while the equipment and pipelines manufactured with 20 # steel should be replaced as soon as possible and monitored regularly to ensure the safety of the production apparatus.