应用线性极化电阻,极化曲线和电化学阻抗测量技术,研究了API Spec X60两种管线钢,即ERW(电阻焊管)和SML(无缝钢管)在中国东海长江口地区不同类型海泥中的电化学腐蚀行为.结果表明,SML管线钢的耐蚀性明显优于ERW管线钢,管线钢在海泥中的腐蚀行为主要受阴极去极化剂-氧的扩散控制.
The corrosion behavior of API Spec X60 pipeline steels, including electric resistance welding(ERW) and Seamless (SML) types,in sea mud gathered fromYangtse River estuaryof the East China Sea was investigatedthrough linear polarization resistance, potentio-dynamic polarizationand electrochemical impedance measurements.The result indicate the improved corrosion resistance of SML in sea mud. The oxygen diffusion in the cathode zone determines the corrosion behavior of pipeline steel in sea mud.
[1]Huang Yan liang(黄彦良),Hou Baorong(侯保荣).E lectrochem ical corrosion m easurem ents of steels in seased im ents[J].Oceanologia et limnologia sin ica,1999,30(1):25~27.
[2]Scu lly J R,Bundy K J.E lectrochem ical m ethods form easurem ent of steel p ipe corrosion rates in soil[J].M aterials Perform ance,1985,24(4):18~25.
[3]Tang Hongyan(唐红雁),Song Guangling(宋光铃).Function of feeb le polarization im itation technology insoil corrosion research[J].Corrosion Sc ience and Pro-tection Technology,1996,8(3):179~184
[4]Song Guangling(宋光铃),Cao Chunan(曹楚南).Re-view on electrochem ical m easurem ents of corrosion insoils[J].O il-Gasfield Surface Engineering,1993,12(3):6~8,18.
[5]W e i Baom ing(魏宝明).M etals Corrosion Theory andApp lication[M].Be ijing:Chem isty Industry Press,1984.196~199.
[6]Cao Chunan(曹楚南).Princ ip les of Corrosion E lectro-chem istry[M].Be ijing:Chem isty Industry Press,2004.45~231.
