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Rare earth 4-hydroxycinnamate compounds as carbon dioxide corrosion inhibitors for steel in sodium chloride solution

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journal contribution
posted on 01.01.2014, 00:00 authored by Dang Nam Nguyen, Motilal Mathesh, Bruce HintonBruce Hinton, Mike Yongjun TanMike Yongjun Tan, Maria ForsythMaria Forsyth
A series of rare earth 4-hydroxycinnamate compounds including Ce(4OHCin)3, La(4OHCin)3, and Pr(4OHCin)3 has been synthesized and evaluated as novel inhibitors for carbon dioxide corrosion of steel in CO2-saturated sodium chloride solutions. Electrochemical measurements and surface analysis have shown that these REM(4OHCin)3 compounds effectively inhibited CO2 corrosion by forming protective inhibiting deposits that shut down the active electrochemical corrosion sites on the steel surface. Inhibition efficiency was found to increase in the order Ce(4OHCin)3 < La(4OHCin)3 < Pr(4OHCin)3 and with increase in inhibitor concentration up to 0.63 mM. Detailed insights into corrosion inhibition mechanism of these compounds in carbon dioxide environment are also provided.

History

Journal

Journal of the electrochemical society

Volume

161

Issue

12

Pagination

C527 - C534

Publisher

Electrochemical Society

Location

Pennington, NJ

ISSN

0013-4651

Language

English

Publication classification

C Journal article; C1 Refereed article in a scholarly journal

Copyright notice

2014, Electrochemical Society