应变速率对Ti425钛合金油气管应力腐蚀的影响
Effect of Strain Rate on Stress Corrosion Cracking of Titanium Alloy Ti425 for Oil and Gas Pipes
摘 要
通过电化学测试、浸泡试验和慢应变速率试验，研究了Ti425钛合金在模拟油气井环境中的腐蚀行为及应变速率对Ti425钛合金应力腐蚀开裂的影响。结果表明：Ti425钛合金具备再钝化性能，腐蚀电流密度较小（数量级为10-7 A/cm2），阻抗较大（数量级为105 Ω·cm2），表面只发生轻微点蚀，且浸泡时间越长，点蚀越严重；当应变速率从10-6 s-1升高到10-3 s-1，钛合金的屈服强度、抗拉强度、断后伸长率和断面收缩率均增大，断口韧窝特征更加明显，二次裂纹减少，应力腐蚀敏感指数降低。
油气管道
应力腐蚀
应变速率
电化学测试
再钝化
titanium alloy
oil and gas pipe
stress corrosion
strain rate
electrochemical measurement
repassivation
Abstract
The corrosion behavior and the effect of strain rate on stress corrosion cracking of titanium alloy Ti425 in simulated environment of oil and gas well were studied by electrochemical measurement, immersion test and slow strain rate test. The results show that Ti425 titanium alloy had repassivation property, low corrosion current density (in magnitude of 10-7 A/cm2) and high impedance (in magnitude of 105 Ω·cm2). Meanwhile, slight pitting corrosion was found on the surface of Ti425 titanium alloy, and the longer the immersion time held, the more serious the pitting corrosion was. When the strain rate was changed from 10-6 s-1 to 10-3 s-1, the yield strength and tensile strength, percentage elongation after fracture and percentage reduction of area increased, the dimple feature of fracture was more evident, meanwhile the secondary crack and the stress corrosion sensitivity index were all reduced.
中图分类号 TG172 DOI 10.11973/fsyfh-202012001
所属栏目 试验研究
基金项目
收稿日期 2019/3/21
修改稿日期
网络出版日期
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引用该论文: WEN Qunfeng,CHENG Xiaoying,ZHANG Xiaoyan,WU Yuhao,ZHANG Chunxia. Effect of Strain Rate on Stress Corrosion Cracking of Titanium Alloy Ti425 for Oil and Gas Pipes[J]. Corrosion & Protection, 2020, 41(12): 1
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参考文献
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【4】GUO Y B,MENG T,WANG D G,et al. Experimental research on the corrosion of X series pipeline steels under alternating current interference[J]. Engineering Failure Analysis,2017,78:87-98.
【5】LIU X,MAO X. Electrochemical polarization and stress corrosion cracking behaviours of a pipeline steel in dilute bicarbonate solution with chloride ion[J]. Scripta Metallurgica et Materialia,1995,33(1):145-150.
【6】查永进,胡世杰,卓鲁斌,等. 钛合金石油管材应用前景研究[J]. 钻采工艺,2017,40(4):1-3.
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【8】DE ASSIS S L,WOLYNEC S,COSTA I. Corrosion characterization of titanium alloys by electrochemical techniques[J]. Electrochimica Acta,2006,51(8/9):1815-1819.
【9】DAI N W,ZHANG L C,ZHANG J X,et al. Distinction in corrosion resistance of selective laser melted Ti-6Al-4V alloy on different planes[J]. Corrosion Science,2016,111:703-710.
【10】POHRELYUK I M,TKACHUK O V,PROSKURNYAK R V. Corrosion resistance of the Ti-6Al-4V titanium alloy with nitride coatings in 0.9% NaCl[J]. JOM,2011,63(6):35-40.
【11】PEACOCK D K,GRAUMAN J S. Crevice and under deposit corrosion resistance of titanium alloys in highly aggressive environments[J]. Materials and Corrosion,1998,49(2):61-68.
【12】DAI N W,ZHANG L C,ZHANG J X,et al. Corrosion behavior of selective laser melted Ti-6Al-4V alloy in NaCl solution[J]. Corrosion Science,2016,102:484-489.
【13】TANG J,LUO H Y,ZHANG Y B. Enhancing the surface integrity and corrosion resistance of Ti-6Al-4V titanium alloy through cryogenic burnishing[J]. The International Journal of Advanced Manufacturing Technology,2017,88(9/10/11/12):2785-2793.
【14】黄显亚,朱祖芳,王得明,等. 钛合金应力腐蚀开裂机理的研究[J]. 中国腐蚀与防护学报,1982,2(4):37-44.
【15】王海杰,王佳,彭欣,等. 钛合金在3.5% NaCl溶液中的腐蚀行为[J]. 中国腐蚀与防护学报,2015,35(1):75-80.
【16】RIHAN R H,ZAFAR M N,AL-HADHRAMI L. A novel emulsion flow loop for investigating the corrosion of X65 steel in emulsions with H2S/CO2[J]. Journal of Materials Engineering and Performance,2016,25(7):3065-3073.
【17】ORTEGA-TOLEDO D M,GONZALEZ-RODRIGUEZ J G,CASALES M,et al. The CO2 corrosion inhibition of a high strength pipeline steel by hydroxyethyl imidazoline[J]. Materials Chemistry and Physics,2010,122(2/3):485-490.
【18】HANAWA T,ASAMI K,ASAOKA K. Repassivation of titanium and surface oxide film regenerated in simulated bioliquid[J]. Journal of Biomedical Materials Research,1998,40(4):530-538.
【19】褚洪. 钛合金的应力腐蚀[J]. 北京科技大学学报,2002,24(1):47-48.
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