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Insights into the Interfacial Process in Electroless Ni-P Coating on Supercritical CO2 Transport Pipeline as Relevant to Carbon Capture and Storage.

08:00 EDT 9th April 2019 | BioPortfolio

Summary of "Insights into the Interfacial Process in Electroless Ni-P Coating on Supercritical CO2 Transport Pipeline as Relevant to Carbon Capture and Storage."

To reduce the amount of greenhouse gas emission and remedy the related environmental damages, the research on carbon capture and storage (CCS) is gaining momentum, so is the search for more effective way for corrosion control of pipeline steel used to transport impure supercritical (SC) CO2. Herein, we prepared an electroless high-phosphorus Ni-P coating and for the first time, systematically explored the underlying mechanism of the interfacial process in applying Ni-P coating to protect pipeline steel that transports impure SC CO2. It is found that, benefiting from the formation of a protective surface film, Ni-P coating significantly mitigates the corrosion effects from SC CO2 and impurities (e.g., O2 and NO2), especially the synergistic effect of impurities. Concurrently, it effectively avoids the localized corrosion resulted from the non-uniform adsorption of aqueous phase. Although O2 and NO2 can degrade the coating through boosting the water precipitation, deteriorating the water chemistry and reducing the surface film protectiveness, the corrosion inhibition efficiency of Ni-P coating is invariably higher than 80%, independent of the varying causticity of SC CO2 streams, demonstrating that the coating has a superior stability towards the corrosion attack. The as-prepared Ni-P coating is of no doubt to hold a great potential as an alternative for corrosion control of CO2 transport pipeline in CCS industry. This work provides a new feasible method to ensure the safe and efficient operation of CCS.

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This article was published in the following journal.

Name: ACS applied materials & interfaces
ISSN: 1944-8252
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