期刊
TRIBOLOGY INTERNATIONAL
卷 146, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2019.106145
关键词
CO2 corrosion; Flow conditions; Local corrosion pits; Wall shear stress
资金
- National Natural Science Foundation of China [51774314]
- Natural Science Foundation of Shandong Province [ZR2018MEM002]
- Fundamental Research Funds for the Central Universities [19CX05001A]
In this paper, local corrosion pits were stimulated by arc defect pits (ADP) of different sizes. The corrosion of specimens was tested in high-speed flow CO2-saturated NACE solution. Electrochemical corrosion characteristics were monitored online. The characteristics of corrosion scale were then investigated by SEM and Raman spectroscopy. The results showed deepening and expansion of corrosion pits will occur at the same time under flow conditions for shallow pits. The development of corrosion pits at certain depth led to formation of complete corrosion scale, which inhibited further corrosion. As corrosion pits deepened, expansion process decreased and deepening rates accelerated. In-depth analysis suggested that corrosion rates were mainly affected by mass transfer rate and integrity of formed corrosion scale.
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