异种金属偶接在高温高酸性环境中的电偶腐蚀行为
Galvanic Corrosion Behavior of Dissimilar Metal Coupling in Highly Acidic Environments
摘 要
模拟150℃，H2S分压1.0 MPa，CO2分压1.5 MPa，Cl-质量浓度200 000 mg/L的高温高酸性腐蚀环境，采用高温高压电化学测试技术和浸泡腐蚀试验，研究了镍基合金718分别与低合金钢35CrMo、20CrMnTi和铝合金2A12偶接后的电偶腐蚀行为，并利用扫描电子显微镜（SEM）与X射线能谱仪（EDS）对腐蚀试样的表面形貌及腐蚀产物成分进行分析。结果表明：在模拟高温高酸性工况下，与镍基合金718偶接后金属的电偶腐蚀速率与两偶接材料的电位差呈正相关，而异种金属偶接对腐蚀产物和腐蚀机理没有明显影响。在高酸性腐蚀环境中使用的井下工具结构在设计时应避免电位差过大的镍基合金718-铝合金2Al2异金属发生偶接。
CO2/H2S
高温高压
电位差
井下工具
galvanic corrosion
CO2/H2S
high temperature and high pressure
potential difference
downhole tool
Abstract
A high temperature and high sour environment of 150℃, 1.0 MPa H2S partial pressure, 1.5 MPa CO2 partial pressure, and 200 000 mg/L Cl- was simulated. Electrochemical tests and immersion corrosion tests were conducted in a high temperature and high pressure autoclave, and the corrosion products formed on the metal surface were analyzed by scanning electron microscopy (SEM) and energy disperse spectroscopy (EDS), which aimed to investigate the galvanic corrosion behavior between nickel-based alloy 718 and 35CrMo/20CrMnTi/2A12, respectively. The results showed that the galvanic corrosion rate after coupling with dissimilar metal was positively correlated with the potential difference between the two different metals,however, there was no significant effects on the mechanism of corrosion and corrosion products. The large potential difference such as 718-2A12 coupling should be avoided during structural design of downhole tools.
中图分类号 TG174.2 DOI 10.11973/fsyfh-201709003
所属栏目 试验研究
基金项目 国家科技重大专项（2016ZX0521005）；中国石化科技部攻关项目（P14113）
收稿日期 2016/2/29
修改稿日期
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引用该论文: ZHANG Rui,RUAN Chenliang,LI Dapeng,MA Lanrong,LU Minxu. Galvanic Corrosion Behavior of Dissimilar Metal Coupling in Highly Acidic Environments[J]. Corrosion & Protection, 2017, 38(9): 671
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【4】刘烈炜,徐东林,张振飞,等. TP110SS/G3钢在H2S/CO2环境中的电偶腐蚀[J]. 石油化工腐蚀与防护,2008,25(1):13-15.
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【8】白真权,任呈强,刘道新. N80钢在CO2/H2S高温高压环境中的腐蚀行为[J]. 石油机械,2004,32(12):14-16.
【9】王庆富,蒲朕,帅茂兵,等. DU-2A12铝合金在3.5% NaCl溶液中的电偶腐蚀行为[J]. 稀有金属材料与工程,2012,43(8):393-396.
【10】史平安,帅茂兵,刘道新,等. 电偶腐蚀的影响因素[J]. 兵器材料科学与工程,2013,36(5):68-73.
【11】陈兴伟,吴建华,王佳,等. 电偶腐蚀影响因素研究进展[J]. 腐蚀科学与防护技术,2010,22(4):363-366.
【12】赵雪会,田伟,白真权,等. 饱和CO2盐溶液中镍基合金和碳钢电偶腐蚀行为[J]. 腐蚀与防护,2009,30(7):484-487.
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