NaCl和Na2S混合溶液pH对SA516Gr70N钢应力腐蚀开裂的影响
Effect of pH on SCC Behavior of SA516Gr70N Steel in NaCl/Na2S Solution
摘 要
通过电化学测试、U型弯曲试验、慢应变速率试验，结合断口形貌的扫描电子显微镜观察，研究了SA516Gr70N钢在不同pH碱性硫化物溶液中的电化学行为，应力腐蚀开裂（SCC）及其机理。结果表明：SA516Gr70N钢在碱性硫化物溶液中具有一定的SCC敏感性，其SCC由阳极溶解和氢致开裂混合控制，其中氢致开裂占主导作用；随着pH升高，SA516Gr70N钢的SCC敏感性降低，腐蚀速率减小；pH升高能够促进阳极钝化并减缓阴极还原过程，从而抑制局部阳极溶解和氢致开裂作用，降低了SA516Gr70N钢的SCC敏感性。
碱性硫化物
pH
应力腐蚀开裂(SCC)
SA516Gr70N steel
alkaline sulfide
pH
stress corrosion cracking (SCC)
Abstract
Electrochemical behavior, stress corrosion cracking (SCC) and SCC mechanism of SA516Gr70N steel in alkaline sulfide solution with different pH values were studied by electrochemical measurements, U-bend tests, slow strain rate tests (SSRT) in combination with fracture morphology observation with scanning electronic microscopy (SEM). The results show that SA516Gr70N steel exhibited a certain SCC susceptibility in alkaline sulfide solution, and the SCC was controlled by a mixture of anodic dissolution and hydrogen-induced cracking, in which hydrogen-induced cracking played a leading role. With the increase of pH, both the SCC susceptibility and the corrosion rate of SA516Gr70N steel decreased. The increase of pH could accelerate the anodic passivation, and slow down the cathodic hydrogen evolution reaction, thereby inhibiting local anodic dissolution and hydrogen-induced cracking, and reducing the SCC sensitivity of SA516Gr70N steel.
中图分类号 TG174 DOI 10.11973/fsyfh-202111004
所属栏目 试验研究
基金项目 国家重点研发计划重点专项（2017YFF0210404）
收稿日期 2020/4/23
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网络出版日期
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引用该论文: FAN Yi,CHENG Huanlin,LI Hao,LI Xiaorong,WANG Shiqi,ZHAO Baijie. Effect of pH on SCC Behavior of SA516Gr70N Steel in NaCl/Na2S Solution[J]. Corrosion & Protection, 2021, 42(11): 28
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【2】HUANG F, LI X G, LIU J, et al. Hydrogen-induced cracking susceptibility and hydrogen trapping efficiency of different microstructure X80 pipeline steel[J]. Journal of Materials Science, 2011, 46(3):715-722.
【3】LIU Z Y, DONG C F, LI X G, et al. Stress corrosion cracking of 2205 duplex stainless steel in H2S-CO2 environment[J]. Journal of Materials Science, 2009, 44(16):4228-4234.
【4】FLIS J, ZIOMEK-MOROZ M. Effect of carbon on stress corrosion cracking and anodic oxidation of iron in NaOH solutions[J]. Corrosion Science, 2008, 50(6):1726-1733.
【5】FLIS J, ZIOMEK-MOROZ M, FLIS-KABULSKA I. Effect of carbon on corrosion and passivation of iron in hot concentrated NaOH solution in relation to caustic stress corrosion cracking[J]. Corrosion Science, 2009, 51(8):1696-1701.
【6】LI X, ZHANG D, LIU Z, et al. Materials science:Share corrosion data[J]. Nature, 2015, 527(7579):441-442.
【7】LUO H, DONG C F, XIAO K, et al. Characterization of passive film on 2205 duplex stainless steel in sodium thiosulphate solution[J]. Applied Surface Science, 2011, 258(1):631-639.
【8】LIU S, SUN H Y, SUN L J, et al. Effects of pH and Cl- concentration on corrosion behavior of the galvanized steel in simulated rust layer solution[J]. Corrosion Science, 2012, 65:520-527.
【9】LUO H, DONG C F, LI X G, et al. The electrochemical behaviour of 2205 duplex stainless steel in alkaline solutions with different pH in the presence of chloride[J]. Electrochimica Acta, 2012, 64:211-220.
【10】CUI Z Y, LIU Z Y, WANG L W, et al. Effect of pH value on the electrochemical and stress corrosion cracking behavior of X70 pipeline steel in the dilute bicarbonate solutions[J]. Journal of Materials Engineering and Performance, 2015, 24(11):4400-4408.
【11】LIU Z Y, DU C W, ZHANG X, et al. Effect of pH value on stress corrosion cracking of X70 pipeline steel in acidic soil environment[J]. Acta Metallurgica Sinica (English Letters), 2013, 26(4):489-496.
【12】ZAINAL ABIDIN N I, MARTIN D, ATRENS A. Corrosion of high purity Mg, AZ91, ZE41 and Mg2Zn0.2Mn in Hank's solution at room temperature[J]. Corrosion Science, 2011, 53(3):862-872.
【13】MA H Y, CHENG X L, LI G Q, et al. The influence of hydrogen sulfide on corrosion of iron under different conditions[J]. Corrosion Science, 2000, 42(10):1669-1683.
【14】LIU Z Y, ZHAI G L, LI XIAOGANG, et al. SCC of XT0 and Its deteriorated microstructure in simulated acid soil environment[J]. Journal of Materials Science & Technology, 2009, 25(2):169-174.
【15】CHEN W, KING F, JACK T R, et al. Environmental aspects of near-neutral pH stress corrosion cracking of pipeline steel[J]. Metallurgical and Materials Transactions A, 2002, 33(5):1429-1436.
【16】LIU Z Y, LI X G, DU C W, et al. Local additional potential model for effect of strain rate on SCC of pipeline steel in an acidic soil solution[J]. Corrosion Science, 2009, 51(12):2863-2871.
【17】刘智勇, 董超芳, 李晓刚. 3Cr17Ni7Mo2SiN不锈钢硫化氢环境下的应力腐蚀开裂[J]. 机械工程学报, 2011, 47(6):62-68.
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【24】LIANG P, LI X G, DU C W, et al. Stress corrosion cracking of X80 pipeline steel in simulated alkaline soil solution[J]. Materials & Design, 2009, 30(5):1712-1717.
【25】CHEN X, LI X G, DU C W, et al. Effect of cathodic protection on corrosion of pipeline steel under disbonded coating[J]. Corrosion Science, 2009, 51(9):2242-2245.
【26】SRIRAM R, TROMANS D. Stress corrosion cracking of carbon steel in caustic aluminate solutions-crack propagation studies[J]. Metallurgical Transactions A, 1985, 16(5):979-986.
【27】FENG R, BECK J, ZIOMEK-MOROZ M, et al. Effects of H2S and pH on tafel slopes in electrochemical corrosion of high strength carbon steel S-135 in alkaline brines[J]. ECS Transactions, 2016, 72(17):59-71.
【28】ZUO Y, PANG R, LI W, et al. The evaluation of coating performance by the variations of phase angles in middle and high frequency domains of EIS[J]. Corrosion Science, 2008, 50(12):3322-3328.
【29】褚武扬, 吕荣邦, 乔利杰, 等. 油井管钢氢致开裂门槛值研究[J]. 金属学报, 1998, 34(10):1077-1083.
【30】HUANG H H, TSAI W T, LEE J T. Electrochemical behavior of A516 carbon steel in solutions containing hydrogen sulfide[J]. Corrosion, 1996, 52(9):708-713.
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