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中南大学学报(自然科学版)

Journal of Central South University

第47卷    第2期    总第258期    2016年2月

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文章编号:1672-7207(2016)02-0690-07
氢对X80钢在库尔勒土壤模拟溶液中应力腐蚀开裂行为的影响
谢飞1,王丹1,吴明1,宋嘉良2,张康南1,杨旭1

(1. 辽宁石油化工大学石油天然气工程学院,辽宁抚顺,113001;
2. 中国石油天然气运输公司浙江分公司,浙江杭州,310005
)

摘 要: 采用电化学充氢技术、动电位扫描技术、交流阻抗技术(EIS)和慢应变速率拉伸试验(SSRT)研究库尔勒土壤模拟溶液中氢对X80管线钢应力腐蚀开裂(SCC)行为的影响,并利用扫描电镜(SEM)观察试样断口形貌。研究结果表明:充氢电流密度和充氢时间的增加均能加速金属腐蚀反应;随着充氢量的增大,试样自腐蚀电位呈下降趋势,腐蚀速率逐渐增大,氢促进了X80钢在库尔勒模拟溶液中腐蚀的发展;电化学充氢后,X80钢的应力腐蚀开裂行为主要由氢致开裂(HIC)作用决定,阳极溶解过程只起到辅助裂纹形核的作用,因为氢能引起材料局部塑性变形,促进裂纹尖端形核和扩展。

 

关键词: X80钢;氢;电化学;土壤模拟溶液;应力腐蚀开裂

Effects of hydrogen on stress corrosion cracking behavior ofX80 steel in Ku’erle soil simulated solution
XIE Fei1, WANG Dan1, WU Ming1, SONG Jialiang2, ZHANG Kangnan1, YANG Xu1

1. School of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China;
2. Zhejiang Branch, CNPC PetroChina , Hangzhou 310005, China

Abstract:The effects of hydrogen on stress corrosion cracking (SCC) behavior of X80 pipeline steel in simulated Ku''''erle soil solution were investigated by electrochemical hydrogen charging, dynamic potential scanning technology, electrochemical impedance spectroscopy (EIS) and slow strain rate test (SSRT). And the fracture surfaces were observed by scanning electron microscope (SEM). The results show that the metal corrosion reaction can be accelerated with the increase of hydrogen current density and time. The corrosion potential of the metal descends and the corrosion rate decreases with the increase of hydrogen concentration. Hydrogen promotes the corrosion development of X80 steel in Ku’erle simulated solution. Hydrogen induced cracking (HIC) plays a decisive role in the SCC behavior of the sample after hydrogen charging. Anodic dissolution process merely plays an auxiliary role in the crack nucleation, because to hydrogen can cause material local deformation, and promote the crack tip nucleation and extension.

 

Key words: X80 steel; hydrogen; electrochemistry; simulated soil solution; stress corrosion cracking

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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