外加电位对X80管线钢在轮南土壤模拟溶液中应力腐蚀行为的影响

doi:10.11902/1005.4537.2019.118

中国腐蚀与防护学报

2020, Vol. 40

Issue (4): 325-331 DOI: 10.11902/1005.4537.2019.118

研究报告

本期目录 | 过刊浏览

外加电位对X80管线钢在轮南土壤模拟溶液中应力腐蚀行为的影响

朱丽霞¹^,²(

), 贾海东³, 罗金恒¹, 李丽锋¹, 金剑³, 武刚¹, 胥聪敏⁴

1.中国石油集团石油管工程技术研究院石油管材及装备材料服役行为与结构安全国家重点实验室西安 710077
2.西安理工大学材料学院西安 710048
3.中石油管道有限责任公司西部分公司乌鲁木齐 830013
4.西安石油大学材料科学与工程学院西安 710065

Effect of Applied Potential on Stress Corrosion Behavior of X80 Pipeline Steel and Its Weld Joint in a Simulated Liquor of Soil at Lunnan Area of Xinjiang

ZHU Lixia¹^,²(

), JIA Haidong³, LUO Jinheng¹, LI Lifeng¹, JIN Jian³, WU Gang¹, XU Congmin⁴

1. State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi'an 710077, China
2. School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China
3. PetroChina West Pipeline Company, Urumchi 830013, China
4. School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China

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摘要:

采用慢应变速率拉伸 (SSRT) 实验、SEM观察和动电位极化曲线测量等方法，研究了外加电位对X80管线钢母材及焊缝在轮南土壤模拟溶液中的应力腐蚀开裂 (SCC) 行为。结果表明，X80钢母材及焊缝在轮南土壤模拟溶液中均具有一定的应力腐蚀敏感性。在同一外加电位下，X80钢焊缝的SCC敏感性高于母材的；X80钢SCC敏感性及开裂机理受外加电位影响显著，在-500 mV外加阳极电位下，X80钢的SCC机理为裂尖阳极溶解-膜破裂机制，在-800 mV阴极电位以下 (-850，-1000和-1500 mV)，氢脆作用在SCC过程中的影响明显增强，阴极析氢反应促进了钢的氢致开裂，导致X80钢SCC敏感性显著增加。

关键词 ： X80管线钢, 应力腐蚀开裂, 外加电位, 土壤环境, 腐蚀机理

Abstract：

The stress corrosion cracking (SCC) behavior of X80 pipeline steel and its weld joint in a simulated liquor of soil at Lunnan area of Xinjiang was studied by means of slow strain rate tensile tests (SSRT), SEM observation and potentiodynamic polarization tests. The results showed that both the X80 pipeline steel and its weld joint have obvious SCC susceptibilities, and the mode of fracture cracking propagation is transgranular cracking (TGSCC) under different applied potentials, and the SCC susceptibility of the weld seam is higher than that of the base metal under the same applied potential. SCC susceptibility and mechanism would vary with the applied potential. At -500 mV, the SCC of both X80 steel and its weld joint may be ascribed to the synergistic action of the anodic dissolution (AD) at crack tip and the rupture of passivation film. The SCC susceptibility of X80 pipeline steel increased markedly for potentials below -800 mV (-850, -1000 and -1500 mV) due to a strong hydrogen embrittlement (HE) effect on SCC process and hydrogen induced cracking promoted by cathodic hydrogen evolution reaction.

Key words： X80 pipeline steel stress corrosion cracking applied potential soil environment corrosion mechanism

收稿日期: 2019-08-03

ZTFLH:

TG172.4

基金资助:国家重点研发计划(2016YFC0801204);陕西省自然科学基金(2019JQ-937)

通讯作者: 朱丽霞 E-mail: zhulx@cnpc.com.cn

Corresponding author: ZHU Lixia E-mail: zhulx@cnpc.com.cn

作者简介: 朱丽霞，女，1980年生，博士生，高级工程师

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引用本文:

朱丽霞, 贾海东, 罗金恒, 李丽锋, 金剑, 武刚, 胥聪敏. 外加电位对X80管线钢在轮南土壤模拟溶液中应力腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2020, 40(4): 325-331.
Lixia ZHU, Haidong JIA, Jinheng LUO, Lifeng LI, Jian JIN, Gang WU, Congmin XU. Effect of Applied Potential on Stress Corrosion Behavior of X80 Pipeline Steel and Its Weld Joint in a Simulated Liquor of Soil at Lunnan Area of Xinjiang. Journal of Chinese Society for Corrosion and protection, 2020, 40(4): 325-331.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.118 或 https://www.jcscp.org/CN/Y2020/V40/I4/325

图1 慢应变速率拉伸试样尺寸图

图2 X80管线钢母材及焊缝在轮南土壤模拟溶液中不同外加电位下的SSRT曲线

图3 X80管线钢母材及焊缝的断面收缩率损失系数Iψ

图4 X80管线钢母材及焊缝在空气中和不同外加电位下的断口SEM形貌

图5 X80管线钢母材及焊缝在空气中和不同外加电位下的断口侧面SEM形貌

图6 X80管线钢母材及焊缝在轮南土壤模拟溶液中的快慢扫极化曲线

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