期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 17, 页码 16243-16251出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b03623
关键词
coatings; supercritical CO2; surface film; synergistic effect; water chemistry; corrosion protection
资金
- Natural Sciences and Engineering Research Council of Canada [GRPIN-2016-05494]
To reduce the amount of greenhouse gas emissions and remedy related environmental damage, the research on carbon capture and storage (CCS) is gaining momentum and so is the search for a more effective way to control corrosion 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., O-2 and NO2), especially the synergistic effect of impurities. Concurrently, it effectively avoids the localized corrosion resulting from nonuniform adsorption of the aqueous phase. Although O-2 and NO2 can degrade the coating through boosting 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 toward corrosion attack. The as-prepared Ni-P coating undoubtedly holds great potential as an alternative for corrosion control of CO2 transport pipeline in the CCS industry. This work provides a new, feasible method to ensure the safe corrosion control of CO, transport pipeline in the CCS industry. This work provides a new, feasible method to ensure the safe and efficient operation of CCS.
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