钛与316L不锈钢在模拟油气环境中电偶腐蚀行为研究
Study on the galvanic corrosion behavior of different titanium alloys and 316L stainless steel in simulated oil and gas conditions
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- 引用格式:
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王非,王雅熙,高小娟,姜放,施岱艳,李天雷,欧阳星宇,于洋.钛与316L不锈钢在模拟油气环境中电偶腐蚀行为研究[J].天然气与石油,2026,44(1):88-93.doi:10.3969/j.issn.1006-5539.2026.01.011
Wang Fei, Wang Yaxi, Gao Xiaojuan, Jiang Fang, Shi Daiyan, Li Tianlei, Ouyang Xingyu, Yu Yang.Study on the galvanic corrosion behavior of different titanium alloys and 316L stainless steel in simulated oil and gas conditions[J].Natural Gas and Oil,2026,44(1):88-93.doi:10.3969/j.issn.1006-5539.2026.01.011
- DOI:
- 10.3969/j.issn.1006-5539.2026.01.011
- 作者:
- 王非1 王雅熙1 高小娟2 姜放1 施岱艳1 李天雷1 欧阳星宇3 于洋3
Wang Fei1, Wang Yaxi1, Gao Xiaojuan2, Jiang Fang1, Shi Daiyan1, Li Tianlei1, Ouyang Xingyu3, Yu Yang3
- 作者单位:
- 1. 中国石油工程建设有限公司西南分公司, 四川 成都 610041; 2. 中国石油天然气股份有限公司浙江油田分公司物资设备与工程管理中心, 浙江 杭州 311100; 3. 有研工程技术研究院有限公司, 北京 101407
1. CPECC Southwest Company, Chengdu, Sichuan, 610041, China; 2. PetroChina Zhejiang Oilfield Company Material Equipment and Engineering Management Center, Hangzhou, Zhejiang, 311100, China; 3. General Research Institute for Nonferrous Metals, Beijing, 101407, China
- 关键词:
- 模拟工况;电偶腐蚀;电化学;耐蚀性能
Simulated working conditions; Galvanic corrosion; Electrochemistry; Corrosion resistance
- 摘要:
在油气输送管道中,异种金属连接导致的电偶腐蚀会大大降低管道寿命和安全性,电偶腐蚀效应的强弱与电偶对材料有很大影响。开展了模拟工况腐蚀失重实验和模拟工况电化学实验,研究了TA2、TA3和TA10这3种钛合金材料在模拟油气环境中与316L不锈钢的电偶腐蚀效应差异以及动电位极化曲线差异。研究结果表明:3种钛材料在120 ℃含H2S和CO2环境下的耐蚀性强弱顺序为TA3>TA2>TA10,但3种钛材料的腐蚀速率均小于0.025 mm/a,属于轻度腐蚀。当3种钛材料与316L不锈钢形成电偶对时,3种钛材料腐蚀速率均下降,其中TA10的腐蚀速率最低(0.000 7 mm/a),而316L不锈钢的腐蚀速率提高,TA10与316L不锈钢的电偶腐蚀效应最为严重。3种钛材料的动电位极化曲线均存在明显的钝化区间,说明材料在模拟工况中存在良好的钝化性能。通过Tafel拟合可知3种钛材料的自腐蚀电流密度与腐蚀速率存在一致的变化规律,但具体数值仍存在较大差异,说明电化学方法对评价材料耐蚀性差异有一定指导作用,但不能用于精确的定量分析。研究结果可为油气环境中耐蚀材料的选择及应用提供参考。
In oil and gas pipelines, galvanic corrosion caused by dissimilar metal connections significantly reduces pipeline service life and safety. The severity of galvanic corrosion is closely related to the materials involved in the galvanic couple. Simulated corrosion weight loss tests and electrochemical experiments were conducted to investigate the differences in galvanic corrosion behavior and potentiodynamic polarization curves among three titanium alloy materials(TA2, TA3 and TA10) coupled with 316L stainless steel in simulated oil and gas environments. Results show that the corrosion resistance of the three titanium materials in an H2S-and CO2-containing environment at 120 ℃ follows the order TA3>TA2>TA10. However, the corrosion rates of all three materials are less than 0.025 mm/a, indicating mild corrosion. When the three titanium materials form galvanic couples with 316L stainless steel, their corrosion rates all decrease, while the corrosion rate of 316L stainless steel increases. Among them, TA10 exhibits the lowest corrosion rate of 0.000 7 mm/a, but the galvanic corrosion effect between TA10 and 316L stainless steel is the most severe. The potentiodynamic polarization curves of the three titanium materials exhibit distinct passivation regions, indicating good passivation behavior under simulated conditions. Tafel fitting analysis revealed that the corrosion current density and corrosion rate of the three titanium materials follow consistent trends, but their absolute values differ significantly. This indicates that electrochemical methods provide qualitative guidance for evaluating corrosion resistance differences among materials, but cannot be used for precise quantitative analysis. These findings provide reference for the selection and application of corrosion-resistant materials in oil and gas environments.
