X80管线钢焊接接头的组织对其超临界CO2腐蚀行为的影响
Effect of Microstructure of Welded Joint of X80 pipeline Steel on Its Corrosion Behaviors in Supercritical CO2
摘 要
研究了X80管线钢焊接接头组织对其超临界CO2腐蚀行为的影响。采用金相显微镜观察高温回火后X80管线钢焊接接头的不同区域(基材区、细晶热影响区、粗晶热影响区和焊缝区)的组织特征。采用扫描电镜(SEM)观察该焊接接头不同区域在含饱和水的超临界CO2(40℃,10 MPa)气相环境中腐蚀后的形貌,并采用X射线衍射仪(XRD)分析腐蚀产物物相。结果表明:基材区和焊缝区主要由多种形式铁素体构成;细晶热影响区和粗晶热影响区组织为多种形式铁素体和珠光体;在含饱和水的超临界CO2环境中焊接接头各区域都发生明显的CO2腐蚀,花型碳酸亚铁腐蚀产物岛分散在致密腐蚀产物表面,且腐蚀产物膜下出现腐蚀坑;基材区、焊缝区、粗晶热影响区的M-A岛主要在晶界析出,故膜下局部腐蚀严重,而细晶热影响区的M-A岛在晶体内弥散析出且晶粒细小,故膜下局部腐蚀轻微。
焊接
腐蚀
超临界
二氧化碳
pipeline
welding
corrosion
supercritcal
carbon dioxide
Abstract
The effect of microstructure of X80 pipeline steel welded joint on its corrosion behavior in supercritical carbon dioxide (SC-CO2) environment was studied. The microstructure of base metal (BM), fine grain heat affected zone (FGHAZ), coarse grain heat affected zone (CGHAZ), and welding metal (WM) of X80 pipeline steel welded joint after high temperature tempering were observed by metallurgical microscopy. The corrosion morphology of different zones in the welded joint corroded in gas phase environment of SC-CO2 containing saturated water under condition of 40 ℃ and 10 MPa were observed by scanning electron microscopy (SEM), and the phase composition of the corrosion scale was analyzed by X-ray diffraction (XRD). The results show that the BM and WM consisted of different forms of ferrites. The microstructure of FGHAZ and CGHAZ were different forms of ferrites and pearlites. CO2 corrosion could be found in all zones of the welded joint obviously in SC-CO2 environment containing saturated water, and flowerlike iron carbonate corrosion scale islands dispersed on the surface of dense corrosion scale. Corrosion pits under the corrosion scale appeared at all zones. Localized corrosion under scale was heavy at BM, WM, CGHAZ due to Martensite-austenite (M-A) islands precipitating at grain boundaries, while it was slight at FGHAZ due to the dispersive precipitation of M-A islands in grain and grain refinement.
中图分类号 TG172 DOI 10.11973/fsyfh-202208007
所属栏目 试验研究
基金项目 中石化重点科研项目(319016-5);重庆科技学院校内科研基金资助项目(CK2016Z09);重庆市自然科学基金项目(cstc2019jcyj-msxmX0181)
收稿日期 2020/8/2
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联系人作者邓洪达(dhd7730@163.com)
引用该论文: YAO Bin,GAO Qiuying,ZHANG Chao,YAN Yongbo,DENG Hongda,LAN Wei. Effect of Microstructure of Welded Joint of X80 pipeline Steel on Its Corrosion Behaviors in Supercritical CO2[J]. Corrosion & Protection, 2022, 43(8): 36
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【3】喻西崇,李志军,潘鑫鑫,等. CO2超临界态输送技术研究 . 天然气工业,2009,29(12):83-86,148.
【4】李廷取,吴化,李雪松. 天然气输气管线钢的CO2腐蚀行为 . 腐蚀与防护,2008,29(5):260-263.
【5】张玉成,屈少鹏,庞晓露,等. 超临界CO2条件下钢的腐蚀行为研究进展 . 腐蚀与防护,2011,32(11):854-858.
【6】LEE J Y,KEENER T C,YANG Y J. Potential flue gas impurities in carbon dioxide streams separated from coal-fired power plants . Journal of the Air & Waste Management Association,2009,59(6):725-732.
【7】THODLA R,AYELLO F,SRIDHAR N. Materials performance in supercritical CO2 environments //Corrosion 2009,Houston,TX:NACE International,2009:09255.
【8】HOWE R. Carbonic acid and its derivatives //Supplements to the 2nd Edition of Rodd's Chemistry of Carbon Compounds. Amsterdam:Elsevier,1975:153-269.
【9】CHACZYKOWSKI M,OSIADACZ A J. Dynamic simulation of pipelines containing dense phase/supercritical CO2-rich mixtures for carbon capture and storage . International Journal of Greenhouse Gas Control,2012,9:446-456.
【10】STILL J R. Welding of AISI 4130 and 4140 steel for drilling systems . Welding Journal,1997,76(6):37-42.
【11】CHAVES I A,MELCHERS R E. Pitting corrosion in pipeline steel weld zones . Corrosion Science,2011,53(12):4026-4032.
【12】ELIYAN F F,ALFANTAZI A. On the theory of CO2 corrosion reactions-Investigating their interrelation with the corrosion products and API-X100 steel microstructure . Corrosion Science,2014,85:380-393.
【13】LI C W,WANG Y,CHEN Y H. Influence of peak temperature during in-service welding of API X70 pipeline steels on microstructure and fracture energy of the reheated coarse grain heat-affected zones . Journal of Materials Science,2011,46(19):6424-6431.
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【16】ELIYAN F F,ALFANTAZI A. Corrosion cyclic voltammetry of two types of heat-affected zones (HAZs) of API-X100 steel in bicarbonate solutions . Metallurgical and Materials Transactions B,2014,45(6):2464-2474.
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【22】TUTTLE R N. Corrosion in oil and gas production . Journal of Petroleum Technology,1987,39(7):756-762.
【23】CUI G,YANG Z Q,LIU J G,et al. A comprehensive review of metal corrosion in a supercritical CO2 environment . International Journal of Greenhouse Gas Control,2019,90:102814.
【24】DENG H D,CAO X L,YAN Y B,et al. Effect of microstructure on corrosion of welded joints of X80 steel in water saturated supercritical CO2 . Anti-Corrosion Methods and Materials,2019,66(4):425-431.
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【26】王力伟,杜翠薇,刘智勇,等. Fe3C和珠光体对低碳铁素体钢腐蚀电化学行为的影响 . 金属学报,2011,47(10):1227-1232.
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【28】RALSTON K D,BIRBILIS N,DAVIES C H J. Revealing the relationship between grain size and corrosion rate of metals . Scripta Materialia,2010,63(12):1201-1204.
【29】LI Y,LIU Z Y,FAN E D,et al. Effect of cathodic potential on stress corrosion cracking behavior of different heat-affected zone microstructures of E690 steel in artificial seawater . Journal of Materials Science & Technology,2021,64:141-152.
【30】CHOI Y S,NEŠI Ć S. Determining the corrosive potential of CO2 transport pipeline in high pCO2-water environments . International Journal of Greenhouse Gas Control,2011,5(4):788-797.
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