Corrosion and salt scale resistance of multilayered diamond-like carbon film in CO2 saturated solutions

The corrosion and scaling performance of a multilayered diamond-like carbon (DLC) film deposited on mild steel in simulated CO2-enhanced oil recovery conditions was systematically investigated. An extremely low corrosion rate of the film compared to the uncoated pipeline steel in CO2-saturated solutions was observed. It indicates that the DLC film can be effective in preventing carbon steel from long-term corrosion attack, owing to a minimization of submicro-scale defects by corrosion product deposition. It can also prevent the formation of salt scales in CO2-saturated conditions. The DLC film may be an ideal coating material on pipelines for preventing both corrosion and scale formation.