Corrosion behaviour of X65 carbon steel under the intermittent oil/water wetting: A synergic effect of flow velocity and alternate immersion period

The effect of flow on corrosion behaviour of carbon steel under intermittent oil/water wetting was investigated by a newly-modified “alternate wetting cell”, combining with the use of potentiostatic polarisation, in-situ visualisation, contact angle measurements and scanning electron microscopy (SEM). The oil/water wetting time was determined by the formation of a thin oil/water film on the electrode surface after the transition of immersion state. A short alternate oil/water immersion period and low flow velocity can increase the ratio (oil to water wetting time) and efficiently mitigate the corrosion, proposing a logistic regression tendency between corrosion mitigation efficiency and oil/water wetting time.