为了研究稀土元素Ce对X100管线钢显微组织和耐腐蚀性能的影响,利用蔡司显微镜、场发射电子显微镜及其配套的能谱仪和电化学工作站对不同Ce含量的4种试验钢0,1,2,3号(Ce质量分数分别为0,0.001 7%,0.002 8%,0.004 9%)进行测试。结果表明:随着Ce含量的增多,试验钢表面的晶粒尺寸减小,Al2O3夹杂被改性为CeAlO3夹杂和Ce2O3夹杂。浸泡7 d后,4种试验钢的腐蚀电位均比较接近;浸泡30 d后3号试验钢的腐蚀电位较之前提高了8.94%,2号和1号试验钢的腐蚀电位分别较之前提高了6.34%和6.06%;浸泡45 d后,1号试验钢的腐蚀电位较7 d时降低了10.38%,其他3种试验钢的腐蚀电位变化不大。0号试验钢的容抗弧半径随浸泡时间的延长而逐渐减小,3号试验钢的容抗弧半径增大得最为明显。测试结果均表明,Ce含量的增加会提高试验钢的耐腐蚀性能。
For studying the effect of rare earth element Ce on the microstructure and corrosion resistance of X100 pipeline steel, the four kinds of experimental steels with different Ce contents (mass fractions of Ce were 0,0.001 7%,0.002 8%, and 0.004 9%, respectively) was tested by using a Zeiss microscope, field emission electron microscope with accompanying energy spectrometer and electrochemical workstation. Results showed that as the Ce content increased, the grain size on the surface of the test steel decreased, and Al2O3 inclusions were modified to CeAlO3 and Ce2O3 inclusions. After 7 d of immersion, the corrosion potential of the four test steels was relatively close. After 30 d of immersion, the corrosion potential of the No.3 test steel increased by 8.94% compared to before, while the No.2 and No.1 test steels increased by 6.34% and 6.06%, respectively. After immersing for 45 d, the corrosion potential of No.1 test steel decreased by 10.38% compared to the situation at 7 d, while the corrosion potential of the other three test steels exhibited little change. In addition, the capacitance arc radius of No.0 test steel gradually decreased with the prolongation of immersion time, and the increase in the capacitance arc radius of No.3 test steel was the most significant. The above results all indicated that the increase of the Ce content would improve the corrosion resistance of the test steel.
[1] 张 斌,钱成文,王玉梅,等.国内外高钢级管线钢的发展及应用[J].石油工程建设,2012,38(1):1-4.
ZHANG B, QIAN C W, WANG Y M,et al. Development and application of high grade pipeline steel at home and abroad[J]. Petroleum Engineering Construction,2012,38(1):1-4.
[2] 熊 丹, 赵 杰, 顾红艳, 等. 长输油气高强管线钢的腐蚀研究进展[J]. 腐蚀科学与防护技术,2017,29(4): 443-450.
XIONG D, ZHAO J, GU H Y, et al. Corrosion Research progress of long-haul oil and gas high-strength pipeline steel [J]. Corrosion Science and Protection Technology,2017,29(4): 443-450.
[3] 杨 旭,孙福洋. SRB+IOB对X100管线钢在常熟土壤模拟溶液中应力腐蚀开裂行为的影响[J].材料保护,2021,54(2):21-26.
YANG X, SUN F Y. Effect of SRB+IOB on Stress Corrosion Cracking Behavior of X100 Pipeline Steel in simulated solution of Changshu soil [J]. Materials Protection, 201,54(2):21-26.
[4] 王路兵,武会宾,任 毅, 等.终冷温度对X100管线钢组织与性能的影响[J].热加工工艺,2007(14):21-23.
WANG L B, WU H B, REN Y, et al. Effect of Final Cooling Temperature on Microstructure and Properties of X100 Pipeline Steel [J]. Hot Working Technology,2007(14):21-23.
[5] 胥聪敏,罗金恒,周 勇,等.SRB对X100管线钢在西北盐渍土壤中应力腐蚀开裂行为的影响[J].材料热处理学报,2016,37(5):82-88.
XU CONG M, LUO J H, ZHOU Y, et al. Effect of SRB on Stress Corrosion Cracking behavior of X100 pipeline Steel in saline soil in Northwest China [J]. Journal of Materials and Heat Treatment,2016,37(5):82-88.
[6] BAGHERI M, ZHU S P, AMINE BEN SEGHIER M E, et al. Hybrid intelligent method for fuzzy reliability analysis of corroded X100 steel pipelines [J]. Engineering with Computers, 2021, 37(4): 2 559-2 573.
[7] 李春龙.稀土在钢中应用与研究新进展[J].稀土,2013,34(3):78-85.
Li C L. Application and Research progress of rare Earth in Steel [J]. Rare Earth,2013,34(3):78-85.
[8] 杨志荣,闫德胜,杨怀君.夹杂物对15MnB钢冲击性能的影响[J].金属热处理,2020,45(11):32-37.
YANG Z R, YAN D S, YANG H J. Effect of inclusions on Impact Properties of 15MnB Steel [J]. Heat Treatment of Metals,20,45(11):32-37.
[9] 李佳梅,葛 文,张飞霞,等.Ce含量对双脉冲电沉积Ni-Co合金层结构及耐蚀性的影响[J].材料保护,2015,48(11):8-10.
LI J M, GE W, ZHANG F X, et al. Effect of Ce Content on Structure and Corrosion Resistance of Ni-Co Alloy layer by double pulse Electrodeposition [J]. Materials Protection,2015,48(11):8-10.
[10] 郭铁波.稀土对 9Cr2Mo 钢抗热冲击能力的影响[J].哈尔滨理工大学学报,2000,5(1):107-110.
GUO T B. Effect of Rare Earth on Thermal Shock Resistance of 9Cr2Mo Steel [J]. Journal of Harbin University of Science and Technology, 2000,5 (1) : 107-110.
[11] 元鹏鹏,李能和,樊自田.Ce对管线钢在混凝土环境中腐蚀行为的影响[J].铸造技术,2016,37(7):1 342-1 345.
YUAN P P, LI N H, FAN Z T. Effect of Ce on Corrosion Behavior of Pipeline Steel in Concrete Environment [J]. Casting Technology,2016,37(7):1 342-1 345.
