Effect of CO₂ Partial Pressure on the Corrosion Behavior of J55 Carbon Steel in 30% Crude Oil/Brine Mixture.
Effect of CO₂ Partial Pressure on the Corrosion Behavior of J55 Carbon Steel in 30% Crude Oil/Brine Mixture.
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效果%20of%20CO2%20部分%20压力%20on%20the%20腐蚀%20行为%20of%20J55%20碳%20钢%20in%2030%%20原油%20油/盐水%20混合物
DOI：
10.3390/ma11091765
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发表时间：
2018-09-18
期刊：
影响因子：
--
通讯作者：
Zhang N
中科院分区：
文献类型：
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作者：
Bai H;Wang Y;Ma Y;Zhang Q;Zhang N
研究了CO2分压对J55碳钢在65 °C、30%原油/盐水中的腐蚀速率、腐蚀形貌、化学成分和腐蚀深度的影响。基于对局部腐蚀形成的认识，提出了腐蚀机理。结果表明，在含CO2的30%原油/盐水中发生局部腐蚀。腐蚀速率随CO2分压（P）从0增加到1.5 MPa而急剧增加，从P = 1.5 MPa减小到P = 5.0 MPa，在P = 5.0 MPa时再次增加，在P = 9.0 MPa后达到一个恒定值。系统pH值最初下降，迅速增加，然后稳定的CO2分压增加。在初始阶段，J55碳钢在CO2/30%原油/盐水混合物中的表面表现出强烈的腐蚀。总之，CO2分压通过改变腐蚀产物膜的形成进而影响腐蚀速率来影响FeCO 3的防护性能。
The influence of CO2 partial pressure on the corrosion properties, including corrosion rate, morphology, chemical composition, and corrosion depth, of J55 carbon steel in 30% crude oil/brine at 65 °C was investigated. A corrosion mechanism was then proposed based on the understanding of the formation of localized corrosion. Results showed that localized corrosion occurred in 30% crude oil/brine with CO2. The corrosion rate sharply increased as the CO2 partial pressure (P) was increased from 0 to 1.5 MPa, decreased from P = 1.5 MPa to P = 5.0 MPa, increased again at P = 5.0 MPa, and then reached a constant value after P = 9.0 MPa. The system pH initially decreased, rapidly increased, and then stabilized as CO2 partial pressure was increased. In the initial period, the surface of J55 carbon steel in the CO2/30% crude oil/brine mixtures showed intense corrosion. In conclusion, CO2 partial pressure affects the protection performance of FeCO3 by changing the formation of corrosion scale and further affecting the corrosion rate.