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- Title
地面管网含硫酸性腐蚀环境用缓蚀剂的性能与作用机制.
- Authors
李薛; 孙振华; 周海刚; 魏旭; 周兆院; 刘晶姝
- Abstract
An N-doped carbon dots corrosion inhibitor was synthesized by microwave method to improve the corrosion problem of ground pipe network under sulfur-containing acidic high-temperature environment. Its corrosion inhibition effect on N80 carbon steel in simulated solution at 25 ℃,60 ℃ and 90 ℃ was tested by electrochemical and weight loss methods. The results showed that the efficiency of corrosion inhibitor(ECI)increased with the increase of the temperature. The ECI reached the maximum of 94.16% at the temperature of 25 ℃ at the NCDs dosage of 150 mg/L. The maximum was 82.92% at the temperature of 60 ℃ at the NCDs dosage of 200 mg/L. At the temperature of 90 ℃ and at the NCDs dosage of 150 mg/L,it reached up to 69.59%. The analysis of corrosion morphology showed that the depth and number of corrosion pits on the steel were the largest at the temperature of 90 ℃. The adsorption isotherm curve showed that the adsorption equilibrium constant of NCDs was the largest at 90 ℃,but the local corrosion was more serious at high temperature. In addition,it is found that the adsorption type of N-doped carbon dots was physical and chemical mixed adsorption. The carbon dots corrosion inhibitor could effectively solve the corrosion of ground pipelines at high temperature and prolong the service life.
- Subjects
ADSORPTION isotherms; PIPELINE corrosion; HIGH temperatures; CARBON steel; SERVICE life; DOPING agents (Chemistry); MILD steel; STEEL corrosion; QUANTUM dots
- Publication
Oilfield Chemistry, 2023, Vol 40, Issue 3, p509
- ISSN
1000-4092
- Publication type
Article
- DOI
10.19346/j.cnki.1000-4092.2023.03.020