Cr对管线钢组织演变及耐蚀性能的影响

doi:10.13251/j.issn.0254-6051.2023.12.043

金属热处理 ›› 2023, Vol. 48 ›› Issue (12): 260-268.DOI: 10.13251/j.issn.0254-6051.2023.12.043

Cr对管线钢组织演变及耐蚀性能的影响

彭浩平^1,2,3, 苏威¹, 赵永刚¹, 李智伟¹, 苏旭平^2,3, 吴长军^2,3

1.常州大学江苏省油气储运技术重点实验室, 江苏常州 213164;
2.常州大学江苏省材料表面科学与技术重点实验室, 江苏常州 213164;
3.常州大学江苏省光伏科学与工程协同创新中心, 江苏常州 213164

收稿日期:2023-08-04 修回日期:2023-10-08 出版日期:2023-12-25 发布日期:2024-01-29
作者简介:彭浩平(1982—),男,教授,博士,主要研究方向为油气生产储运设施腐蚀防护及安全保障,E-mail: php@cczu.edu.cn
基金资助:
国家自然科学基金(Nos.51971039)

Effect of Cr on microstructure evolution and corrosion resistance of pipeline steel

Peng Haoping^1,2,3, Su Wei¹, Zhao Yonggang¹, Li Zhiwei¹, Su Xuping^2,3, Wu Changjun^2,3

1. Jiangsu Key Laboratory of Oil & Gas Storage and Transportation Technology, Changzhou University, Changzhou Jiangsu 213164, China;
2. Jiangsu Key Laboratory of Material Surface Science and Technology, Changzhou University, Changzhou Jiangsu 213164, China;
3. Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou Jiangsu 213164, China

Received:2023-08-04 Revised:2023-10-08 Online:2023-12-25 Published:2024-01-29

摘要/Abstract

摘要： 采用磁控电弧炉的方法制备了Cr含量(质量分数)分别为1%、2%、3%的X80钢样品,通过SEM、DSC、电化学试验、EDS、拉曼表征等手段测试Cr元素对微观组织以及耐蚀性能的影响。结果表明,微观组织中铁素体晶粒大小随着Cr含量的升高而降低,珠光体数量增多,从X80钢到2Cr钢的变化明显。低频0.01 Hz处的阻抗模量的值|Z|_0.01Hz随着Cr含量的增大而增大,随浸泡时间的延长而变小。当在3.5%NaCl溶液中浸泡进行1天时,3Cr试验钢的|Z|_0.01Hz值约为1315 Ω·cm²,X80试验钢的|Z|_0.01Hz值约为910 Ω·cm²;当浸泡到14天时,3Cr试验钢的|Z|_0.01Hz值约为800 Ω·cm²,X80试验钢的|Z|_0.01Hz值约为470 Ω·cm²。腐蚀介质以及腐蚀反应对钢表面的破坏,可以看到明显的点蚀坑。腐蚀产物主要有β-FeOOH、γ-FeOOH、α-FeOOH、Fe₃O₄和Fe₂O₃等组成,Cr含量的升高,钢表面出现更多的Fe₃O₄和α-FeOOH较稳定的物相,有助于增强腐蚀产物膜的稳定性。

关键词: 管线钢, 合金元素Cr, 微观组织, 腐蚀产物膜

Abstract: Three specimens of X80 steel with different Cr contents (mass fraction) of 1%, 2% and 3% were prepared by means of magnetron arc furnace, and the effects of Cr on microstructure and corrosion resistance were tested by means of SEM, DSC, electrochemical test, EDS and Raman characterization. The results show that the ferrite grain size decreases with the increase of Cr content, and the number of pearlite increases, and the change from the X80 steel to 2Cr steel is obvious. The value of impedance modulus |Z|_0.01Hz at low frequency 0.01 Hz increases with the increase of Cr content and decreases with the prolorgate of soaking time. When soaked in 3.5%NaCl solution for 1 day, the |Z|_0.01Hzvalue of the tested 3Cr steel is about 1315 Ω·cm², and that of the X80 steel is about 910 Ω·cm². When soaked for 14 days, the |Z|_0.01Hzvalue of the tested 3Cr steel is about 800 Ω·cm², and that of the X80 steel is about 470 Ω·cm². The corrosive medium and the corrosive reaction breaks down the steel surface and pitting pits can be seen clearly. Corrosion products are mainly composed of β-FeOOH, γ-FeOOH, α-FeOOH, Fe₃O₄ and Fe₂O₃, etc. Elevated Cr content, more and more stable phases of Fe₃O₄ and α-FeOOH appear on the steel surface, helping to enhance the stability of the corrosion product film.

Key words: pipeline steel, alloying element Cr, microstructure, corrosion product film

中图分类号:

彭浩平, 苏威, 赵永刚, 李智伟, 苏旭平, 吴长军. Cr对管线钢组织演变及耐蚀性能的影响[J]. 金属热处理, 2023, 48(12): 260-268.

Peng Haoping, Su Wei, Zhao Yonggang, Li Zhiwei, Su Xuping, Wu Changjun. Effect of Cr on microstructure evolution and corrosion resistance of pipeline steel[J]. Heat Treatment of Metals, 2023, 48(12): 260-268.

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Cr对管线钢组织演变及耐蚀性能的影响

Effect of Cr on microstructure evolution and corrosion resistance of pipeline steel

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