防喷器用718合金在CO_2、H_2S/CO_2环境中的腐蚀行为研究
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摘要
通过腐蚀失重、应力腐蚀开裂(SCC)性能评价实验以及电化学测试研究了镍基合金718在模拟苛刻H2S/CO2环境和CO2环境中的腐蚀行为。结果表明:在模拟高温高压H2S/CO2腐蚀环境中,镍基合金718具有极其优越的抗均匀腐蚀、局部腐蚀和SCC性能;在饱和CO2腐蚀体系中,718合金的阳极极化曲线存在明显的钝化区,加入H2S后,极化电阻减小,钝化膜的保护作用减弱;镍基合金718在饱和CO2溶液体系中均具有较好的钝化和再钝化能力,且在50℃时,其点蚀电位最高,滞后环最小,耐缝隙腐蚀性能良好。
The corrosion behavior of nickel-base alloy 718 in simulated severe H_2S/CO_2 environment and CO_2 environment were studied by corrosion mass loss test, stress corrosion cracking(SCC) test and electrochemistry analysis. The results show that the nickel-base alloy 718 possesses the excellent resistance to uniform corrosion, local corrosion and SCC in the simulated high temperature and high pressure H_2S/CO_2 corrosion environment. In saturated CO_2 corrosion system, the anodic polarization curve of 718 alloy has obvious passivation zone, with the addition of H_2S, the polarization resistance decreases and the protective effect of the passivation film is weakened. The nickel-base alloy 718 has good passivation and re-passivation ability in saturated CO_2 solution system, and its pitting potential is highest and the hysteresis loop is smallest at 50 ℃, showing good crevice corrosion resistance.
The corrosion behavior of nickel-base alloy 718 in simulated severe H_2S/CO_2 environment and CO_2 environment were studied by corrosion mass loss test, stress corrosion cracking(SCC) test and electrochemistry analysis. The results show that the nickel-base alloy 718 possesses the excellent resistance to uniform corrosion, local corrosion and SCC in the simulated high temperature and high pressure H_2S/CO_2 corrosion environment. In saturated CO_2 corrosion system, the anodic polarization curve of 718 alloy has obvious passivation zone, with the addition of H_2S, the polarization resistance decreases and the protective effect of the passivation film is weakened. The nickel-base alloy 718 has good passivation and re-passivation ability in saturated CO_2 solution system, and its pitting potential is highest and the hysteresis loop is smallest at 50 ℃, showing good crevice corrosion resistance.
引文
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[2]张洁.井口防喷器故障的常见原因及其规避措施略论[J].中国石油化工标准与质量,2014(10):77-77.
[3]赵学会,白真权,尹成先,等.镍基合金在含H2S/CO2环境下的电化学腐蚀行为研究[J].腐蚀科学与防护技术,2009,21(6):526-529.
[4]阮臣良,岳小琪,张瑞,等.温度对718镍基合金在高酸性环境下耐腐蚀性能的影响[J].材料保护,2017,50(3):88-90.
[5] Rashmi B, Collins A, Silverman S.Use of alloy 718 and 725in oil and gas industry[C]//proceedings of the fifth internationalconference on superalloys 718, 625, 706 and various deriva-tives.Houston:TMS,2001:47-55.
[6]王春光,王东哲,万红,等.Inconel718合金在高含H2S/CO2环境下的应力腐蚀试验[J].热加工工艺,2015,44(10):107-109.
[7]宋宜四,高万夫,王超.热处理工艺对Inconel718合金组织、力学性能及耐蚀性能的影响[J].材料工程,2012(6):37-42.
[8] Mo Yan, Wang Dong-zhe, Jiang Bin, et al.Influences of grainsize on electrochemical corrosion behaviors of nickel-basedalloy 718[J].Materials Sciences Forum,2016,852:105-112.
[9]蒲洪江.新851井井口装置受损情况分析研究[J].天然气工业,2005,25(3):85-88.
[10]张钧,王星,谢俊峰,等.模拟缝隙腐蚀环境中闭塞区内的临界pH值研究[J].热加工工艺,2017,46(24):79-83.
[11] Schutz R W, Thodla R, Baxter C F et al.66th NACE AnnualConference[C].Houston:Omnipress,2011:119.
[12]高文平,吕祥鸿,谢俊峰,等.苛刻环境中钛合金石油管材的抗腐蚀性能研究[J].稀有金属材料与工程,2018,47(1):151-156.
[13]谢丽华,陈长风,李鹤林,等.镍基合金和铬在高温下的腐蚀电化学特征[J].西安石油大学学报(自然科学版),2012,27(2):76-79.
[14] Jing W, Xu L N, Zhang L, et al.Effect of temperature tocrevice corrosion of autenitic and duplex stainless steel indeepwater[J].Regional,2012,4:2881-2891.
[15] Cai B P, Liu Y H, Tian X J, et al, An experimental study ofcorrosion behavior of 316L stainless steek in artifical seawater[J]. Corros.Sci.,2010,52:3235-3242.
[16]王荣,杨爱民,雒设计,等.管道的腐蚀与控制[M].西安:西北工业大学出版社,2013.
[17]王健.2205双相不锈钢的点蚀及再钝化行为[D].大连:大连理工大学,2015.
[18]贾志军,张新,杜翠薇,等.CO2饱和的0.5 mol/L Na Cl溶液中温度对3Cr低合金钢腐蚀行为的影响[J].材料保护,2012,45(3):23-26.
[19] Valen S, Gartland P O.Crevice corrosion repassivation tem-peratures of highly alloyed stanless steels[J].Corrosion,1995,51(10):750-756.
[20] Ahmad S, Malik A.Corrosion behaviour of some stainlesssteels in chlorinated Gulf seawater[J].Journal of AppliedElectrochemistry,2001,31(9):1009-1016.
[21]魏爱玲.镍基合金028材料在高含氯离子环境中的抗腐蚀性能[D].西安:西安石油大学,2011.