Rare earth carboxylate compounds on the barrier properties
The date of：
2024-08-23
viewed:
1
Rare earth carboxylate compounds on the barrier properties and active corrosion inhibition of epoxy coatings on mild steel
Researchers found that the addition of lanthanum 4-hydroxycinnamic acid (La(4-OHcin)3) and yttrium 3-(4-methylbenzoyl)propionate (Y(mbp)3) to bisphenol-based epoxy resin coatings significantly improves corrosion resistance and delays electrolytic penetration.In a current 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. 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 equiIn a curten 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.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”.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. 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 delayvalent 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
-
10
-
28
Click on the number of times:
1
来源：mining.comMinespider and critical minerals broker Rare Earth Ventures (REV) have entered into a strategic partnership aimed at bringing traceability to rare earth and other mineral supply chains in...
2025
-
10
-
27
Click on the number of times:
2
来源 ：mining.comAustralian Strategic Materials Ltd. aims to choose a location for its planned US rare earths plant by the end of this year, capitalizing on President Donald Trump’s backing for the secto...
2025
-
10
-
27
Click on the number of times:
0
来源：mining.com More than three years after it was announced, Brazil’s Mining Policy Council has officially been installed, with a renewed focus on critical minerals and rare earths.The Brazilian govern...
2025
-
10
-
24
Click on the number of times:
0
来源：mining.comCanadian rare earth and metals recycler Cyclic Materials announced Wednesday an expansion of its partnership with magnetic materials developer VACUUMSCHMELZE (VAC). The companies have si...