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Indexed by:Journal Papers

Date of Publication:2015-01-01

Journal:CORROSION SCIENCE

Included Journals:SCIE、EI、Scopus

Volume:90

Page Number:296-304

ISSN No.:0010-938X

Key Words:Carbon steel; SEM; EIS; Acid corrosion; Acid inhibition

Abstract:Calcium alginate gel (Alg-Ca2+) capsules loaded with inhibitor and heavy additive were prepared by a piercing-solidifying method. The releasing process of inhibitor together with their inhibitive effect on P110 steel in CO2-saturated 3.5 wt.% NaCl aqueous solution was investigated by ultraviolet-visible spectrophotometer, scanning electron microscopy, electrochemical impedance spectroscopy. Our experiments revealed that the synthesized capsules can gradually release inhibitors during their sinking process, and effectively prevent the tube in oilwell from corrosion. Introducing appropriate amount of heavy additive BaSO4 into the inhibitor-loaded capsules facilitates their sinking processes and corrosion protection performance. (C) 2014 Elsevier Ltd. All rights reserved.