Insight into the corrosion behaviors and mechanism of the self-healing Si/N-DLC films in oilfield environment

• Published in: Corrosion science Vol. 231; p. 111989
• Main Authors: Wei, Xubing, Feng, Haiyan, Liu, Zhengyu, Chen, Zan, Yin, Pingmei, Lu, Shiqi, Ding, Jiaqing, Du, Naizhou, Li, Xiaowei, Zhang, Guangan
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.05.2024
• Subjects: Corrosion; Corrosion mechanism; Oilfield environment; Self-healing; Si/N-DLC films; Corrosion mechanism; Self-healing; Corrosion; Oilfield environment; Si/N-DLC films
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2024.111989

The Si/N-DLC films with different Si and N contents were deposited and the corrosion behaviors in the simulated CO2-saturated oilfield produced water was mainly investigated. Results reveal that Si/N-DLC films improves dramatically the corrosion resistance of the substrate. This attributes to not only the channel blockage caused by diffusion of corrosion products, being composed of silicon oxide (SiOx) and metal oxide, but also the stronger support of increased roughness induced by N to the aggregated corrosion products, implying that the Si/N-DLC film are a self-healing protective film. These results provide theoretical guidance to develop the DLC films for anti-corrosive applications. •A self-healing Si/N-DLC film for corrosion protection was deposited by PECVD technology.•Corrosion behaviors and its stability of Si/N-DLC films in simulated CO2 saturated oilfield produced water was studied.•Si/N-DLC films improves significantly the corrosion resistance of the substrate in oilfield environment.•Mechanism attributed to diffusion channel blockage and strong support for aggregating corrosion products.•Theoretical guidance to develop the DLC films for anti-corrosive applications was provided.