New, environmentally friendly, rare earth carboxylate corrosion inhibitors for mild steel

Somers, Anthony E., Hinton, Bruce R.W., de Bruin-Dickason, Caspar, Deacon, Glen B., Junk, Peter C., and Forsyth, Maria (2018) New, environmentally friendly, rare earth carboxylate corrosion inhibitors for mild steel. Corrosion Science, 139. pp. 430-437.

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Four recently synthesized rare earth 3-(4-methylbenzoyl)propanoate (mbp) compounds (RE = La, Ce, Nd and Y) were evaluated as corrosion inhibitors for mild steel in 0.01 M NaCl. At a concentration of 0.25 mM all the compounds showed some level of inhibition after 30 min immersion, with the Y(mbp)3 complex giving the largest reduction in corrosion current density, from 1.92 mu A/cm(2) for the control sample to 0.25 mu A/cm(2) for the Y based inhibitor. All the RE(mbp)3 inhibitors acted predominantly as anodic inhibitors, showing little effect on the cathodic reaction after 30 min. Surface analysis after 6 h immersion using FTIR and EDS detected the presence of a thin film containing inhibitor components on all surfaces, thus accounting for the reduced corrosion rate, with the Y(mbp)(3) compound having the most significant effect on corrosion and showing the most uniform surface coverage.

Item ID: 54882
Item Type: Article (Research - C1)
ISSN: 1879-0496
Keywords: mild steel, rare earth carboxylate, corrosion inhibition, IR spectroscopy, potentiostatic polarization
Funders: ARC Centre for Green Chemistry, Deakin University
Date Deposited: 01 Aug 2018 07:51
FoR Codes: 34 CHEMICAL SCIENCES > 3402 Inorganic chemistry > 340203 F-block chemistry @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 100%
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