文章分析了X70钢板的点蚀成因并提出了控制措施,试验表明,X70钢的氧化皮均呈现分层情况,氧化皮内有较多裂纹,结构疏松、不致密,导致层流冷却水中的盐分在X70钢氧化皮中残留,使得X70钢氧化皮内的盐分较高,是导致其在存储过程中发生点蚀的主要原因.磷酸根作为一种缓蚀性阴离子,能够提高材料的自腐蚀电位,并与其他离子相互作用,改善氧化皮的保护性能,但含氧酸根本身就能引起点蚀,所以往层流冷却水中添加 PO43-的方法需谨慎.
参考文献
| [1] | 李晓刚;杜翠薇;董超芳.X70钢的腐蚀性为与实验研究[M].北京:科学出版社,2006 |
| [2] | National Energy Board .Report of Public Inquiry Concerning Stress Corrosion Cracking on Canadian Oil and Gas Pipelines[R].Calgary AB,Canada.[s.n.],1996. |
| [3] | 梁平,李晓刚,杜翠薇,陈旭,刘智勇.X80和X70管线钢在NaHCO3溶液中钝化膜的电化学性能[J].石油化工高等学校学报,2008(02):1-5. |
| [4] | Baker M .Stress Corrosion Cracking Studies-Final Report[Technical Report no.TTO-8][R].DOT-Research and Special Programs Administration.[s.l.]:Office of Pipeline Safety,2005. |
| [5] | Niu L;Cheng YF .Development of Innovative Coating Technology for Pipeline Operation Crossing Permafrost Terrain[J].Construction and Building Materials,2008,22:417. |
| [6] | Manfredi C;Otegui J L .Failures by SCC in Buried Pipelines[J].Engineering Failure Analysis,2002,9:495. |
| [7] | 李党国,冯耀荣,白真权,郑茂盛.X80管线钢钝化膜内点缺陷扩散系数的计算[J].应用化学,2008(09):1007-1010. |
| [8] | Meng G Z;Zhang C;Cheng Y F .Effects of Corrosion Product Deposit on the Subsequent Cathodic and Anodic Reactions of X-70 Steel in Near-Neutral pH Solution[J].Corrosion Science,2008,50:3116. |
| [9] | Z. Szklarska-Smialowska .Pitting corrosion of aluminum[J].Corrosion Science,1999(9):1743-1767. |
| [10] | Frankel GS. .Pitting corrosion of metals. A review of the critical factors (vol 145, pg 2186, 1998)[J].Journal of the Electrochemical Society,1998(8):2970-0. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%