Dual function of rare earth carboxylate compounds
The date of：
2024-08-13
viewed:
0
Dual function of rare earth carboxylate compounds on the barrier properties and active corrosion inhibition of epoxy coatings on mild steel
In the research, two rare earth carboxylate compounds, lanthanum 4-hydroxycinnamate (La(4-OHcin)3) and yttrium 3-(4-methylbenzoyl)propanoate (Y(mbp)3), were incorporated into bisphenol-based epoxy resin to investigate their effectiveness in coating barrier properties and active corrosion inhibition. EIS results showed that the incorporation of rare earth carboxylate inhibitors significantly improved corrosion resistance compared to the inhibitor free coating, with the global impedance modulus remaining at a level higher than 1 GΩ cm2 after 219 days immersion.Event Tip: Anticorrosive CoatingsWhat principles determine the corrosion of metals and how can protective coatings help to prevent corrosion? In this tutorial, the basics of electrochemical processes will be explained, and typical ingredients and formulation features of corrosion protection coatings will be presented and discussed. We will answer these questions online on 05 Sep 2024 in the EC Short Course “Introduction to Anticorrosive Coatings”.Following EIS experiments, cross-sectional views of the coatings exhibited a pore-plugging behavior by rare earth containing precipitates, which reinforced the coating barrier properties and delayed the electrolyte diffusion process. These effects were also reflected from the electrochemical parameters extracted from breakpoint frequency analysis and equivalent circuit modelling. Filiform corrosion experiments for artificially scratched coatings suggest that the addition of rare earth carboxylates effectively suppressed the initiation and growth of filaments as well as the development of the coating delamination front. The active corrosion inhibition is possibly related to the formation of a surface protective film consisting of bimetallic complexes and rare earth metal rich precipitates. The electrochemical measurements and surface analyses evidence the dual function of rare earth carboxylate species for enhancing coating barrier properties against electrolyte penetration and providing active corrosion inhibition for the underlying AS1020 mild steel.
Hot News
/
Related to recommend
2025
-
09
-
03
Click on the number of times:
0
Concentration-Quenching-Suppressed Eu3+-Activated Ba3Lu2B6O15 Orange-Red-Emitting Phosphors via One-Dimensional Structural Confinement for Thermally Stable White LEDs 来源：ACS PublicationsConventio...
2025
-
09
-
02
Click on the number of times:
0
Modulating Electrochemical Performance of La2FeNiO6/MWCNT Nanocomposites for Hydrogen Storage Inquiries: Schiff-Base Ligand-Assisted Synthesis and Characterization来源：ACS PublicationsSince the role of ...
2025
-
09
-
01
Click on the number of times:
0
来源：ACS PublicationsThe reaction of [LnIII(OArP-κ2O,P)3] (1-Ln, Ln = La, Sm, Y, Yb, and ArPO– = 2,4-tBu2-6-(Ph2P)C6H2O–) with the copper(I) triflate toluene adduct yields the corresponding dinuclear ra...
2025
-
08
-
29
Click on the number of times:
0
来源：ACS PublicationsMalonate ligands demonstrate versatility for intercalating metal complexes into layered rare-earth hydroxides (LREHs), enabling controlled tuning of coordination geometry and compos...