建立一套温度、压力、流速可控的流动加速腐蚀试验装置,模拟某蒸汽冷凝水管线工况,对20钢、Q345R钢、304不锈钢三种材料进行了流动加速腐蚀试验,采用电化学测量方法得到三种钢的Tafel曲线.应用扫描电镜(SEM)和能谱仪(EDS)对腐蚀产物膜的厚度、形貌与组分进行了分析.结果表明,相同工况条件下,腐蚀速度从大到小依次为20钢、Q345R钢、304不锈钢;20钢的腐蚀产物膜结构为球状;Q345R钢存在两种腐蚀产物膜结构,即网状结构和片状结构;304不锈钢腐蚀产物膜的结构为片状,有效的保护了基体材料.
The flow-accelerated-corrosion performance of 20 steel, Q345R steel and 304 stainless steel was investigated in condensed water by using a flow accelerated corrosion test apparatus with three electrodes measurement. Scanning electron microscope (SEM) and energy disperse spectroscopy (EDS) were employed to investigate the thickness, microstructure of corrosion scale. The results showed that the corrosion rates of the test steels were different with a decrease ranking as 20 steel〉Q345R steel〉304 stainless steel. Their microstructure of corrosion scale had different morphologies. The corrosion scale of Q345R steel was thicker than that of 20steel, but much better of compactness of the former ones.
参考文献
[1] | Kain V, Roychowdhary S, Mathew T, et al. Flow accelerated corrosion and its control measures for the secondary circuit pipelines in Indian nuclear power plants[J]. J. Nuclear Mater., 2008, 383: 86. |
[2] | Nasrazadani S, Nakka R K, Hopkins D, et al. Characterization of oxides on FAC susceptible small-bore carbon steel piping of a power plant[J]. Inter. J. Pressure Vessels Piping, 2009, 1. |
[3] | 刘飞华,晏卫国.大亚湾可电站核岛重要厂用水系统(SEC)典型腐蚀试件及评价[J].腐蚀与防护,2007,12(8):633. |
[4] | 宋守春,毕法森.伊敏电厂高压加热器泄露原因与对策[J].东北电力技术,2007,3:45. |
[5] | 史建强,王印培.管道弯头穿孔失效分析[J].理化检测-物理分册,2007,43:633. |
[6] | 何秋良,王乐勤,杨健.石化工业管道典型部件冲刷破坏预测的CFD模拟研究[D].杭州,浙江大学,2004. |
[7] | Zhang G A, Cheng Y F. Electrochemical characterization and computational fluid dynamics simulation of flow- accelerated-corrosion of X65 steel in a COs-saturated oil- field formation water [J]. Corros. Sci., 2010, 52(8): 2716. |
[8] | Efird K D, Wright E J, Boros J A, et al. Correlation of steel corrosion in pipe flow with jet impingement and rotation cylinder tests [J]. Corros. Eng., 1993, 49(2): 992. |
[9] | 偶国富,曹海彬,朱祖超等.加氢含硫污水管道冲蚀临界特性的电化学测试[J].化工学报,2009,60(3):691. |
[10] | 郁玉贵,姚治铭,柯伟.流体力学因素对冲刷腐蚀的影响机制[J].腐蚀科学与防护技术,2000,12(1):36. |
[11] | Chexal V K, Horowitz J, Dooley K B, et al. Flow- accelerated-corrosion in power plants[R]. Electric Power Research Institute, EPRI, TR-10061R1, 1998. |
- 下载量()
- 访问量()
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%