A novel composite la-conversion coatings for enhanced anti-corrosion performance under a harsh aqueous environment

Abstract

The ceramic lanthanum nanoparticles with uniformly dispersed spherical nanostructures were successfully synthesized using sonication-assisted synthesis. The morphologies and phase compositions were assessed and investigated. The electrochemical impedance analysis potentio-dynamic polarisation measurements were used to calculate the corrosion protection properties of prepared ceramic lanthanum nanoparticles. The La₂O₃ nanoparticles were added as a surface coating layer to enhance the corrosion resistance of low-carbon steel. The particles' impact on coating development, morphology, and corrosion inhibition efficacy were studied. After particle integration, results show a dramatic reduction in porosity and thickness, affecting corrosion resistance. Incorporating ceramic lanthanum nanoparticles into a coating reduces porosity and increases hardness, improving corrosion resistance; the result implies the suggested technique is viable for creating functionalized coatings on low-carbon-based materials. The results also demonstrated that these methods may increase the development and protectiveness of the coating. There was a crucial nano particulate La₂O₃ level at which the conversion coatings exhibited the best protective qualities. As it increased the corrosion potential and lowered the anodic current, the composite La-conversion coatings may offer substantial corrosion protection for prolonged immersion in a 3.5% NaCl solution.

KEY WORDS: Ceramic nanoparticles, Low carbon steel, Corrosion prevention, Polarization

Bull. Chem. Soc. Ethiop. 2024, 38(5), 1453-1468.                                                   

DOI: https://dx.doi.org/10.4314/bcse.v38i5.20